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Amp Internals 2

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Category: General
Forum Name: Amp Forum
Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
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Topic: Amp Internals 2
Posted By: kedwardsleisure
Subject: Amp Internals 2
Date Posted: 03 November 2010 at 5:36pm
Peavey GPS3400

https://flic.kr/p/WqVA7B" rel="nofollow"> https://flic.kr/p/WqVA7B" rel="nofollow - peavey by https://www.flickr.com/photos/156722025@N07/" rel="nofollow - Electro Mechanic , on Flickr

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K. Edwards Electronics Engineers

North Staffordshire




Replies:
Posted By: subbass
Date Posted: 05 November 2010 at 4:11pm
Cloud MPA 626




Posted By: swannie
Date Posted: 16 November 2010 at 11:50am
Gemini XGA4000 power amp / 2x350w @4ohms (not 4000w as the front panel suggest's!!)

Dunlap Clarke Dreadnaught 1000 (mid/late 70's) 2x500w @4 ohms (weighs a ton!!)






Posted By: Wrighty
Date Posted: 16 November 2010 at 2:30pm
Hz DPX600











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ALL YOUR BASS ARE BELONG TO US.


Posted By: Oldmaelstrom
Date Posted: 16 November 2010 at 4:28pm
Dynacord AM12







Posted By: Jez_3phaze
Date Posted: 16 November 2010 at 11:11pm
Similar to Wrighty's Post! /\     Quote picture  removed, Apologies K.
 
My RDL PX 1100 

550w RMS Per Ch@ 4 ohm /1140w RMS Bridge @ 8 ohm.



Posted By: kedwardsleisure
Date Posted: 16 November 2010 at 11:45pm
Do you think that posters can withold from quoting the previous post if it contains large pics, like the last example? I find the multiple repeated pics confusing.




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K. Edwards Electronics Engineers

North Staffordshire



Posted By: Wrighty
Date Posted: 17 November 2010 at 10:00am
Originally posted by Jez_3phaze Jez_3phaze wrote:

Similar to Wrighty's Post!
My RDL PX 1100 


Hmm, a remarkable likeness, yes! Heatsinking looks a bit better on the RDL. It looks a lot cleaner too. This Hz has had its front panel hand painted around the gold lettering with what looks to be black gloss Hammerite! It was given to me to look at by a colleague and may or may not have a fault...


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ALL YOUR BASS ARE BELONG TO US.


Posted By: Grumpy
Date Posted: 17 November 2010 at 3:41pm
Originally posted by swannie swannie wrote:



Dunlap Clarke Dreadnaught 1000 (mid/late 70's) 2x500w @4 ohms (weighs a ton!!)



On that Dunlap Clarke Dreadnaught, the switch on the back marked “Max off Min”. Does it switch transformer secondary windings to give different power outputs, like the old Midas Cube Monitor Amps?


Posted By: swannie
Date Posted: 18 November 2010 at 2:59pm
No the switch is for the fan on this amp, you can adjust the speed or simply have it turned off


Posted By: Monitech
Date Posted: 19 November 2010 at 11:02am

Hmm, a remarkable likeness, yes! Heatsinking looks a bit better on the RDL. It looks a lot cleaner too. This Hz has had its front panel hand painted around the gold lettering with what looks to be black gloss Hammerite! It was given to me to look at by a colleague and may or may not have a fault...
 
now as john savage used to be a sales man for HZ
and martin savage used to own RDL does this not suprise you that they are simalar
regards


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phoenix out of the ashes


Posted By: Grumpy
Date Posted: 19 November 2010 at 11:06am
Originally posted by swannie swannie wrote:

No the switch is for the fan on this amp, you can adjust the speed or simply have it turned off

Thanks, was just curious



Posted By: Oldmaelstrom
Date Posted: 19 November 2010 at 4:08pm
Made in Ukraine 4 channel class D power amplifier, rated power 350W per channel into 4 ohms


Posted By: Wrighty
Date Posted: 19 November 2010 at 4:09pm
I think I know where the inspiration for that front panel design came from...

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ALL YOUR BASS ARE BELONG TO US.


Posted By: kedwardsleisure
Date Posted: 19 November 2010 at 6:49pm


Have a look at this amp and tell me your thoughts!


https://flic.kr/p/WnCtnh" rel="nofollow"> https://flic.kr/p/WnCtnh" rel="nofollow - amptop by https://www.flickr.com/photos/156722025@N07/" rel="nofollow - Electro Mechanic , on Flickr

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K. Edwards Electronics Engineers

North Staffordshire



Posted By: M4trix
Date Posted: 19 November 2010 at 10:18pm
Enjoy repairing that wreckage. Probably you will need to replace the PCB too unless you wanna make wire jumpers over the damaged copper tracks. That PCB looks really nasty. Ouch


Posted By: ceharden
Date Posted: 19 November 2010 at 10:34pm
I suspect after a good clean the damage won't look quite as bad.  I'm curious what the amp is.  I can't quite figure out the topology from those pics.  Also I know one output stage is upside down compared with the other but they still don't look the same.


Posted By: DjLeco
Date Posted: 19 November 2010 at 11:05pm
ClassH 2 step!
 
Failed AB part from it, maybe oversized fuses, or fake 2SA 2SC output devices, the one wich burnt the 2 watts resistor are OPENED emitter, leaving the tension to chain burning other components , because the fuses did not blew when output devices fails...
 
Is an classical class H2 step OVERVOLT failing!
Very Bad!
 
I Bet is CHINA ONE!


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I'm A Stupid SMART Romanian...


Posted By: andyamp
Date Posted: 19 November 2010 at 11:12pm
yep not mde in the EU

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a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: cilla.scope
Date Posted: 20 November 2010 at 12:47am
it looks to be a single channel of 5+5 devices on the left, plus 2 channels of 3+3 devices on the right,  mirror split half way up the PCB on the right if you look.

PSU has different raisl left and right side of the amp, I would guess the right side is 2 channels at a lower voltage than the left.  just noticed its 5 DC supplies wires to each channel ... so theres a bit of rail switching going on

Clearly purpose built as a 3CH, so most likely bass, mid, top  from some sort 3 way box ... .looks too old/crap to be off a powered line array box ..


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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: Louder than loud
Date Posted: 20 November 2010 at 1:47am
i'll post a mackie swa amp up that went bang the other day lol ;)


Posted By: swannie
Date Posted: 20 November 2010 at 9:50am
Rauch P-120


Posted By: ceharden
Date Posted: 20 November 2010 at 9:52am
Going back to the unnamed strange amp, I think Cilla has cracked it.  Well spotted there.


Posted By: Dilbert
Date Posted: 20 November 2010 at 12:56pm

deleted.... just looked closer is this 3 channel? left hand side extra fan cooled bass & 2 x mid / tops on right with less cooling? 



Posted By: kedwardsleisure
Date Posted: 20 November 2010 at 2:48pm
Cilla Leco and Dilbert are getting as warm as that amp was at one time!

It is a mono amp on the left and a class H (rail tracking) stereo on the right to give a 3-channel amp. You will notice that both L & R modules are blown, the one on the right has a large hole right through the board.

All channels have the same no. of transistors on the other side of the heatsink.

Yes it is Chinese, the sort with hotmelt glue on everything and makes of components that no-one's heard of.

A guess of Make and Model is the next one to try!


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K. Edwards Electronics Engineers

North Staffordshire



Posted By: Dilbert
Date Posted: 20 November 2010 at 3:15pm
Looks like its come out the same chinese factory as all the Audiohead / Cmark / Tamp etc.
 
My guess is Audiohead if its been on fire as most of the ones I see have been Geek


Posted By: hmaudio
Date Posted: 20 November 2010 at 4:45pm
T-amp tsa2200 




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Nottingham based cab builder. https://www.facebook.com/HMAudio-154352667920145/?ref=bookmarks
This account is used by 2 people.


Posted By: kedwardsleisure
Date Posted: 20 November 2010 at 5:00pm
Sorry Dilbert that is not the name on the front panel.

It's a well-known brand, at least in the UK.



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K. Edwards Electronics Engineers

North Staffordshire



Posted By: andyamp
Date Posted: 20 November 2010 at 5:11pm
seen it before i think

-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: ceharden
Date Posted: 20 November 2010 at 8:33pm
Void Basys amp by any chance?


Posted By: ceharden
Date Posted: 20 November 2010 at 8:49pm
I'm pretty sure now.....


Posted By: Dilbert
Date Posted: 21 November 2010 at 12:35am
Can i change my guess? Hmmm methinks this belongs to a forum member......


Posted By: cilla.scope
Date Posted: 21 November 2010 at 12:47am
APart pubdrive?  1 sub,  L&R mid tops?

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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: subbass
Date Posted: 21 November 2010 at 12:48am
fiver on it being the void basys amp Wink


Posted By: cilla.scope
Date Posted: 21 November 2010 at 1:17am
yesp , looking at the layout of he connector, its not right for that pubdrive amp .. I go with your call, Void Basys.the fans and layout match, the output rating looks about right.

Void Basys B3 V2.


-------------
My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: swannie
Date Posted: 22 November 2010 at 3:46pm
Biema W220 power amp (300+300 @ 4 ohms)
info http://www.biema.com/html/product/amplifiers/w.htm - http://www.biema.com/html/product/amplifiers/w.htm

This is currently for sale in the for sale section 


Posted By: kedwardsleisure
Date Posted: 22 November 2010 at 5:59pm



https://flic.kr/p/WCyDEH" rel="nofollow"> https://flic.kr/p/WCyDEH" rel="nofollow - DSC00008 by https://www.flickr.com/photos/156722025@N07/" rel="nofollow - Electro Mechanic , on Flickr

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K. Edwards Electronics Engineers

North Staffordshire



Posted By: ceharden
Date Posted: 23 November 2010 at 1:07am
A cheap and nasty amplifier with a fancy front panel!


Posted By: cravings
Date Posted: 23 November 2010 at 2:27am
so this one isn't a Ram oem then?


Posted By: ceharden
Date Posted: 23 November 2010 at 9:05am
They Kyro series were RAM Audio re-badged and are pretty good amps.


Posted By: toastyghost
Date Posted: 23 November 2010 at 9:34am
Originally posted by ceharden ceharden wrote:

A cheap and nasty amplifier with a fancy front panel!


Doesn't sound too shabby though, for what it does! This is mine, and the damage is pretty horrific considering I'd loaned this to somebody for a 'small bar charity gig' to run one basic reflex bin off the bass output, and it was meant to be baby sat by a friend. Curious what they decided to ram into the stereo outs to do this much savagery...

Will be some stern words had once I get the invoice from the good man with it on the bench.

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http://www.neuronproaudio.co.uk" rel="nofollow - http://www.neuronproaudio.co.uk


Posted By: kedwardsleisure
Date Posted: 27 November 2010 at 1:02pm
Chevin Q1004

https://flic.kr/p/WyZdSw" rel="nofollow"> https://flic.kr/p/WyZdSw" rel="nofollow - Q1004 by https://www.flickr.com/photos/156722025@N07/" rel="nofollow - Electro Mechanic , on Flickr

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K. Edwards Electronics Engineers

North Staffordshire



Posted By: cilla.scope
Date Posted: 27 November 2010 at 3:48pm
Yuck! ... wild guess, 90% of the problems come from those connectors between the front PCB and the main board?

nasty.


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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: kedwardsleisure
Date Posted: 27 November 2010 at 5:13pm
Chevin amps are great quality! They do not like being dropped. But their design leads me to think that they are made by higher beings ;-)

Back to earth with a thud, couldnt resist posting this one:




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K. Edwards Electronics Engineers

North Staffordshire



Posted By: jbl_man
Date Posted: 27 November 2010 at 9:39pm
^LOL That about sums it up well!

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Be seeing you.


Posted By: subbass
Date Posted: 04 December 2010 at 4:42pm
spagetti city - samson servo 600

about 30 connectors in there .. some loose already :( (wires too taut)




Posted By: cilla.scope
Date Posted: 04 December 2010 at 8:25pm
jesus h christ on a bike ... what a mess.

which nimrod thought it would be a good idea to strap the transformer secondaries with all their pulses to the rest of the wiring with cable ties?

the designer deserves a good kicking for that one .. it truly is an awful way to build anything ... must be expensive and labour intensive too!


-------------
My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: kedwardsleisure
Date Posted: 04 December 2010 at 8:35pm
I guess Taiwanese labour is cheap

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K. Edwards Electronics Engineers

North Staffordshire



Posted By: jbl_man
Date Posted: 05 December 2010 at 5:08pm
Old school Matamp Quasar 400.
 
 
 
 
 


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Be seeing you.


Posted By: djyves
Date Posted: 08 December 2010 at 6:58pm
Master da800:




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"If brute force doesn't work, you're just not using enough!"


Posted By: kedwardsleisure
Date Posted: 08 December 2010 at 7:04pm
Camco Vortex 6



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K. Edwards Electronics Engineers

North Staffordshire



Posted By: Nitz V1505
Date Posted: 08 December 2010 at 7:05pm

Nice LCR caps in that Matamp 400. Got some of those in the garage.



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LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....


Posted By: andyamp
Date Posted: 08 December 2010 at 7:08pm
best place for the LCR caps.
not being used

-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: Nitz V1505
Date Posted: 08 December 2010 at 7:10pm
LOL

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LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....


Posted By: andyamp
Date Posted: 08 December 2010 at 7:19pm
so you know about them then

-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: Nitz V1505
Date Posted: 08 December 2010 at 7:45pm

No not a great deal. Just got some in a box of odds and sods.



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LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....


Posted By: cilla.scope
Date Posted: 08 December 2010 at 7:48pm
What on earth is that random collection of small caps on the RHS of the PSU in the Camco? is that the secodnary side bulk storage??   Wonder how that works out for bass kick?

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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: cravings
Date Posted: 08 December 2010 at 8:04pm
tell us something about LCR caps then? (i have some old ones which seem to have fallen apart...)


Posted By: Nitz V1505
Date Posted: 08 December 2010 at 8:20pm
Originally posted by andyamp andyamp wrote:

so you know about them then
Should I know something about them Andy? Do they go snap,crackle and pop!!!!! I salvaged eight of em years ago and thought they might come in handy for a diy amp project.
 


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LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING.....


Posted By: andyamp
Date Posted: 08 December 2010 at 8:25pm
I used them in the early days big mistake.
they leaked electrolyte.
LCR stands for "leaky capacitor rubbish".
compleate useless.
put them in the bin.


-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: kedwardsleisure
Date Posted: 08 December 2010 at 8:37pm
Yes the myriad of little caps on the right on the camco are the bus caps high and low. The ones on the left bottom are the mains reservoir caps for the SMPSU.

I dont suppose it matters if they're small if the SMPSU is high enough frequency!

Camco vortex 6 will do 6600W into 1 ohm in parallel mono or 4 ohm bridge.





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K. Edwards Electronics Engineers

North Staffordshire



Posted By: njw
Date Posted: 11 December 2010 at 12:03am
Originally posted by andyamp andyamp wrote:

I used them in the early days big mistake.
they leaked electrolyte.
LCR stands for "leaky capacitor rubbish".
compleate useless.
put them in the bin.
  
 LCR electronics were very local to where I live, they had two workshops, one of them burnt down......


Posted By: Monitech
Date Posted: 12 December 2010 at 5:07pm
LCR caps were always great fire starters


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phoenix out of the ashes


Posted By: andyamp
Date Posted: 12 December 2010 at 5:33pm
LCR POS

-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: njw
Date Posted: 21 December 2010 at 8:28pm
A couple of oldies, A late HH MA150 and an early MA100
 
 
 
Note the additional 'soft start' circuit(also converted to IEC inlet) which seems to work well.
Powered by these(RCA 2n3773)
 
The best part of these amps(apart from the sound obviously)!!
 
  Apart from a few crackly pots both these amps work perfectly although the earlier MA100 does run slightly hotter than the later 150 but it also sounds sweeter, they're also suprisingly loud!! 
 


Posted By: DjLeco
Date Posted: 23 December 2010 at 12:51am
Originally posted by kedwardsleisure kedwardsleisure wrote:


Camco vortex 6 will do 6600W into 1 ohm in parallel mono or 4 ohm bridge.
 
From an ETD 59 Core?
 Be serious!LOL
 
With alot of hard, I obtained 4400Watts of Pure Power from an ETD 59 core, on mine Resonant mode SMPS.
 
3500 Watts continuous from ETD 59 yes, is believable, but 6000Watts, regarding amplifier and SMPS randament,means around 7200-7500 Watts from the power supply stageDead.
 
Also EMI filters are rated for 16 Amps, and power cable looks to be 2,5mm section, usable till 4 Kw.


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I'm A Stupid SMART Romanian...


Posted By: kedwardsleisure
Date Posted: 26 December 2010 at 1:19am
I didnt make that up, I just read it off the back label

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K. Edwards Electronics Engineers

North Staffordshire



Posted By: full speed
Date Posted: 28 December 2010 at 4:28am

the light unbelivable exelent crown XLS 2500



Posted By: cilla.scope
Date Posted: 28 December 2010 at 7:24am
ahh .. wow.

Now, that is NICE! ... got to be right up there with the Peavey IPR stuff in terms of production engineering.  Cooling layout is good, someone thinking "out of the box" there ... few too many relays, but, very nice layout .. thats a neat amp!

I think they could have offered a lot more in that little DSP than just two filters, but I suspect thats a marketing decision rather than a technical limitation. You can just see their custom drive chips to the left of the two main output heatsinks .. from reading their blurb, they are a custom ASIC from TI ... you don't go that route unless you are planning on making a LOT of them ... and it helps keep the competition from copying them :)

Interestingly, the DSP area appears to have been auto-routed .. quite unusual to see much autorouted layout on audio gear ..


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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: full speed
Date Posted: 28 December 2010 at 12:37pm
hi cilla. I have tested the amp his perform is like amps two times the price.very god tight bass (a nice damping factor) and clear not hard middle and high frequensy response.AND very importand heeeaadrome. I thing i by his smaller brothers. 


Posted By: tweeter box
Date Posted: 28 December 2010 at 1:10pm
is there an internall pic up anywhere for the MC2 E90?? 

-------------
PRECISION SOUND SYSTEM.

Feeding the peoples needs for Roots Music.

Strictly premium grade reggae and dub steppers from the early 70's to present day.


Posted By: VentureSound
Date Posted: 28 December 2010 at 2:01pm
Originally posted by cilla.scope cilla.scope wrote:

ahh .. wow.

Now, that is NICE! ... got to be right up there with the Peavey IPR stuff in terms of production engineering.  Cooling layout is good, someone thinking "out of the box" there ... few too many relays, but, very nice layout .. thats a neat amp!

I think they could have offered a lot more in that little DSP than just two filters, but I suspect thats a marketing decision rather than a technical limitation. You can just see their custom drive chips to the left of the two main output heatsinks .. from reading their blurb, they are a custom ASIC from TI ... you don't go that route unless you are planning on making a LOT of them ... and it helps keep the competition from copying them :)

Interestingly, the DSP area appears to have been auto-routed .. quite unusual to see much autorouted layout on audio gear ..


What do you think all those SMT resistors and leaded poly caps are underneath the speaker terminals are? Looks like it may be part of the output LPF? Not sure why there are all those resistors.


Posted By: cilla.scope
Date Posted: 28 December 2010 at 2:31pm
I suspect they are the output Zobel network, you can't get very big SMT resistors, and they obviously preferred 50 SMT resistors to 1 hand inserted leaded device ... 50 SMTs will have been cheaper both in component count and assembly costs.

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My girlfriend thinks I'm a stalker.
Well, she's not exactly my girlfriend yet ...


Posted By: jbl_man
Date Posted: 28 December 2010 at 3:19pm
Originally posted by njw njw wrote:

A couple of oldies, A late HH MA150 and an early MA100
 
 
 
 
 
 
I allways wondered why HH never added an extra output stage,and made it a stereo (2x100w) amp.there was allways plently of room to have done it.....especially in the S130 slave,which was mostly fresh air inside!


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Be seeing you.


Posted By: Tony Wilkes
Date Posted: 03 January 2011 at 12:17pm
Used by me to power 2 x Wharfedale  Super RS12DD per channel back in the mid 70's, took over from a Quad 303 that was useless for PA because of its thermal envelope.
This amp still works perfectly to this day and has only had the switches replaced !!!




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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)


Posted By: jbl_man
Date Posted: 03 January 2011 at 12:28pm
Originally posted by Tony Wilkes Tony Wilkes wrote:

Used by me to power 2 x Wharfedale  Super RS12DD per channel back in the mid 70's, took over from a Quad 303 that was useless for PA because of its thermal envelope.
This amp still works perfectly to this day and has only had the switches replaced !!!


 
I like the shaft running the entire depth of the amp,to connect the input selector knob to the rotary switch on the rear input pcb! Mechanical engineering over electronics!


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Be seeing you.


Posted By: audiomik
Date Posted: 03 January 2011 at 12:31pm
Re: "I allways wondered why HH never added an extra output stage,and made it a stereo (2x100w) amp.there was allways plently of room to have done it.....especially in the S130 slave,which was mostly fresh air inside!"

Think the answer to this is that the early versions were based upon identical circuitry for the Power Amps in their TPA series - first of the IC100 guitar Amps had a different power amp PCB and MJ2501/3001 Darlington output transistors....
The pic you have is of a later version.
Mik

-------------
Warning! May contain Nuts
plus springs, washers, screws, etc, etc.


Posted By: Oldmaelstrom
Date Posted: 03 January 2011 at 5:50pm
Dynacord SL2400







Posted By: MunkeyQ
Date Posted: 03 January 2011 at 7:04pm
Originally posted by jbl_man jbl_man wrote:

I like the shaft running the entire depth of the amp,to connect the input selector knob to the rotary switch on the rear input pcb! Mechanical engineering over electronics!

I have an old Grundig hi-fi amp which took this one step further - the mains switch was right by the cord's inlet, and the front panel button moved it with a system of nylon cord over pulleys and levers! The matching tuner changed bands by physically changing the RF stage PCB to a different one mounted on a carousel when you turned the knob. I'll try and get some photos up...amp's got a very serious transformer.

It's done with source selector switches in modern gear to try and reduce the signal path length, although unless the amp is really, really electrically noisy I can't really see the benefit.


Posted By: full speed
Date Posted: 04 January 2011 at 4:49am
dynacord lx 3000


Posted By: full speed
Date Posted: 04 January 2011 at 4:57am
pv 2000


Posted By: Wrighty
Date Posted: 04 January 2011 at 9:53am
My colleague's got some of the EV CP series which are the same as those Dynacords - been very impressed with them, especially considering how little the CP3000 and 4000 weigh with their SMPSUs.

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ALL YOUR BASS ARE BELONG TO US.


Posted By: Biggus
Date Posted: 06 January 2011 at 7:26pm
arlsbro CPX800 Does anybody know the specs on this im wondering what it does at 8ohms




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http://www.electrolite.co.uk" rel="nofollow - electrolite.co.uk - http://www.summertimeradio.com" rel="nofollow - summertimeradio.com


Posted By: csg
Date Posted: 06 January 2011 at 7:48pm
used to have a lot of these, last of the uk quality kit from them. bombproof.

approx 250w/ch into 8 ohms


Posted By: Biggus
Date Posted: 06 January 2011 at 7:51pm
Originally posted by csg csg wrote:

approx 250w/ch into 8 ohms

Cheers that info is useful, this is my backup amp


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http://www.electrolite.co.uk" rel="nofollow - electrolite.co.uk - http://www.summertimeradio.com" rel="nofollow - summertimeradio.com


Posted By: tweeter box
Date Posted: 12 January 2011 at 12:47pm
Originally posted by tweeter box tweeter box wrote:

is there an internall pic up anywhere for the MC2 E90?? 
 
anyone?


-------------
PRECISION SOUND SYSTEM.

Feeding the peoples needs for Roots Music.

Strictly premium grade reggae and dub steppers from the early 70's to present day.


Posted By: JR.junior
Date Posted: 12 January 2011 at 8:53pm

Dynacord powermate 1600-2, two filter caps coocked..



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Support the scoop technology, larger mouth plays louder!


Posted By: csg
Date Posted: 16 January 2011 at 6:42pm

citronic ppx300. Thats a lot of amp for 150w @ 4r / ch...forgotten that these were made with alps blue pots in, very nice


Posted By: andyamp
Date Posted: 16 January 2011 at 6:45pm
alps super pots the best

-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: subbass
Date Posted: 16 January 2011 at 7:07pm
oops


Posted By: GAZ.
Date Posted: 16 January 2011 at 7:40pm
Saw CSG's pics of the PPX 300, and I thought I'd post some of my PPX 150.









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100% Earth Moving Bass


Posted By: andyamp
Date Posted: 16 January 2011 at 8:36pm
good old mosfet amps


-------------
a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: ceharden
Date Posted: 16 January 2011 at 9:40pm
One I had the misfortune to repair recently.  Luckily only the bridge rectifier and soft start NTC's which had failed but still had to fight my way through the jungle in order to get to the relevant parts.  Absolutely bloody ridiculous design in terms of internal wiring.  And mostly because they're too cheapskate to use double sided PCB's.  This picture was taken after I'd tried to loom it up with cable ties but that was a fairly pointless exercise.





Posted By: ceharden
Date Posted: 16 January 2011 at 9:43pm
I forgot to mention that as standard it comes with the single insulated mains wiring, loomed to the audio signal cables!  Hmmmmmmmmmmm......!


Posted By: andyamp
Date Posted: 16 January 2011 at 9:45pm
see the moron rap around the toridal transformer

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a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: kedwardsleisure
Date Posted: 16 January 2011 at 9:53pm
InterM not bad really! The Wedgwood Visitor Centre here in Staffs has its internal audio commentaries powered off a rack of these, they are on 24/7.



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K. Edwards Electronics Engineers

North Staffordshire



Posted By: ceharden
Date Posted: 16 January 2011 at 9:57pm
That's one of the annoying things about it really.  In some ways it's not a bad design at all.  Just a shame they couldn't get the internal wiring correct.

Incidentally the original fault was probably caused by the sh1t pressed paper PSU PCB snapping in one corner and allowing the underside to touch the case, shorting one of the supply rails to ground and blowing the bridge rectifier.



Posted By: VentureSound
Date Posted: 16 January 2011 at 11:16pm
Originally posted by andyamp andyamp wrote:

see the moron rap around the toridal transformer


What do you mean by this Andy?


Posted By: andyamp
Date Posted: 16 January 2011 at 11:25pm
can you see that the transformer has somthing raped around the outside of it,under the milar insulation.


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a wise man changes his mind a fool does not.
http://www.matrixamplification.com/ - http://www.matrixamplification.com/


Posted By: hmaudio
Date Posted: 17 January 2011 at 5:13pm
Amptec 2.0


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Nottingham based cab builder. https://www.facebook.com/HMAudio-154352667920145/?ref=bookmarks
This account is used by 2 people.



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