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Oldmaelstrom View Drop Down
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Points: 15 		Direct Link To This Post Posted: 18 March 2010 at 3:51pm
FBTMaxX 4A Processed Active Monitor 300+100W
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Points: 1683 		Direct Link To This Post Posted: 25 March 2010 at 12:47am
Samson servo 201a
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Points: 15 		Direct Link To This Post Posted: 25 March 2010 at 8:23pm
Not amplifier, but interesting too - dBx DriveRack PX










Edited by Oldmaelstrom - 25 March 2010 at 8:33pm
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Points: 245 		Direct Link To This Post Posted: 25 March 2010 at 9:16pm
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Dynacord LX2200 (Electrovoice CP3000)
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Points: 360 		Direct Link To This Post Posted: 28 March 2010 at 7:22am
 
Cerwin Vega CV-900
 
I know it's hardly a particularly powerful amp (210Wpc @ 8r) and CV don't have a particularly good reputation for their amps, but I was still surprised at how little was inside. (The 2 caps are both 10,000uF if you're interested)
 
Cheers
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Points: 3532 		Direct Link To This Post Posted: 28 March 2010 at 7:31am
Originally posted by BlueDragon BlueDragon wrote:

 
Cerwin Vega CV-900

 

I know it's hardly a particularly powerful amp (210Wpc @ 8r) and CV don't have a particularly good reputation for their amps, but I was still surprised at how little was inside. (The 2 caps are both 10,000uF if you're interested)

 

Cheers


Little isn't always better... I think a lot of cerwin amps are disco branded amps really. Never really fussed me unlike the smalled Tamps rated similar sized to this amp.

My old Tamp 700 model had more in it than the cerwin, transformer was a little bigger and it did 260@ 8ohms p channel.
According to suicide statistics, Monday is the favored day for self-destruction.



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Points: 5912 		Direct Link To This Post Posted: 28 March 2010 at 12:04pm
that samson servo is a bit of a mess! 
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Points: 23 		Direct Link To This Post Posted: 28 March 2010 at 12:17pm
Dynamic Precision P400P















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I have around 160 pictures from this amplifier
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Points: 1719 		Direct Link To This Post Posted: 28 March 2010 at 8:29pm
Them amps look wicked mate!!!! Love the fat transformer and caps.proper job.
LET THE BASS ROLL LIKE THUNDER
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Points: 244 		Direct Link To This Post Posted: 31 March 2010 at 5:32pm
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Points: 817 		Direct Link To This Post Posted: 01 April 2010 at 11:56pm

Mine club amplifier, saturday it have sudden death...

Working on 2,66 ohm/channel/mid-hi 110 Hz above.

 
Died NTC thermistors 10 ohm  from inrush current limmiter circuit.

But oficially, those must been shorted by blue relais after 2-3 seconds from startup, but relais doesnt receive 24 volts for coil...

TO ALL OWNERS OF PROLINE 2700,PROLINE 3000, SI PHONIC, check and better , REPLACE, parralel diode on relais coil  (D503 at  Proline 2700 si 3000),Specially if is 1N4148 with 1N4007.

Also replace the transistor wich commands the 24Vdc for relais coil (TR503 at Proline 2700 si 3000), officialy is C2240 (2SC2240) with BD139 or better, BD237.

As ideea, the ones wich have Proline 2700, or Proline 3000 amps, and found those NTC thermistors burned, the relais doesn't work well.

 

Amp 1:

Burned PCB:

Output devices, originals ON Semiconductor:

Final stage Ch1:

Trafo:

NTC:

NTC differency with the ones that I put there:

NTC changed:

Secondary Cu-Em, just 1,5mm diameter, TOO TINY!!

Soft start:

Here is where must be changed those transistors and diode!

 

[size=16]Small movies:


Inrush current limmiter now working!:

Prezentare+1Ch @ 1000 Hz ,max 76,5 Vrms-4 ohm:
Ch1+Ch2 @ 1000 Hz/4 ohm:
Ch1+Ch2 @ 100 Hz/4 ohm:
Ch1+Ch2 @ 30 Hz/4 ohm:
Ch1+Ch2 @ 5000 Hz/4 ohm:
Ch1+Ch2 @ 10000 Hz/4 ohm:
Ch1+Ch2 @ 20000 Hz/4 ohm:
Just Ch 1 @1000Hz and 100 Hz/2 ohm:
Just Ch 1 @30 Hz-2 ohm
Just Ch 1 @100 Hz/2 ohm supply voltage dropping:
Advantages and disadvantages:
 
Comments or questions,are welcomed!

 
I'm A Stupid SMART Romanian...
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