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MunkeyQ 
Registered User
Beware,Scammer.
Joined: 23 May 2009
Location: near london
Status: Offline
Points: 449
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 Posted: 19 October 2010 at 12:26pm |
 Centauri wrote:
Yamaha PD2500
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I like the long centrifugal blower on that amp, never seen that before. Bet it's a lot quieter than a couple of 80mm axial fans screaming away.
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ryanbairan
Registered User
Joined: 29 September 2008
Location: asia
Status: Offline
Points: 68
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Posted: 19 October 2010 at 8:28am |
Mackie Thump 15a
Edited by ryanbairan - 19 October 2010 at 8:31am
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mystyca
Registered User
Joined: 19 August 2010
Location: Deeside
Status: Offline
Points: 158
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Posted: 16 October 2010 at 9:48pm |
Nice 
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DJ
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Centauri
Old Croc
Joined: 29 November 2004
Location: Newcastle Aus
Status: Offline
Points: 1792
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Posted: 16 October 2010 at 12:49am |
Yamaha PD2500  
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Centauri
Old Croc
Joined: 29 November 2004
Location: Newcastle Aus
Status: Offline
Points: 1792
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Posted: 16 October 2010 at 12:37am |
Another Mosfet amp from the 80's - Aussie built Australian Monitor AM1600. 800W / chan into 4 ohms.  
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mystyca
Registered User
Joined: 19 August 2010
Location: Deeside
Status: Offline
Points: 158
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Posted: 15 October 2010 at 11:57pm |
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Maybe Contemporary but there ugly, they look like they don't belong on it and make it look cheap, they don't match the Black with Red front panel, They'd look fine on a cheap old mixer desk with silver and black front panel. I'm not saying that there not original but if they are the designer was colour blind.
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DJ
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audiomik
Old Croc
Joined: 06 April 2010
Location: Bath, UK
Status: Offline
Points: 2962
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Posted: 15 October 2010 at 11:44pm |
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what's wrong with the Knobs and Caps?
They're contemporary to the Amplifier - seems some people just don't understand keeping things as near as possible to original!
Mik
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc.
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mystyca
Registered User
Joined: 19 August 2010
Location: Deeside
Status: Offline
Points: 158
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Posted: 15 October 2010 at 11:27pm |
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Eh Oh, Are those LCR cap's I see, Also Ugly Knobs!!! When ya get this going get rid of those knobs they do not do it any justice. look like something off a 70's twin deck or something yuk.
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DJ
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audiomik
Old Croc
Joined: 06 April 2010
Location: Bath, UK
Status: Offline
Points: 2962
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Posted: 15 October 2010 at 11:03pm |
An old Mosfet Amp from the 1980's, currently in need of some repairs, built for Bass Charrington Pubs - Toby Sound amp TSR-450S, 'larger brother' of the TSR-150X earlier in this thread.
One Channel tested into 8ohms is 200watts output and the design rating is 2x 225watts into 4ohms.
View from the front before cleaning and repairs - a sort of 'before' pic:
Mik
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Warning! May contain Nuts
plus springs, washers, screws, etc, etc.
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Big-G
Young Croc
Joined: 28 November 2006
Location: Naarfuk
Status: Offline
Points: 1141
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Posted: 15 October 2010 at 9:42pm |
Agreed, debate over, more internals please 
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They know what is what but they don't know what is what they just strut what the  .
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mystyca
Registered User
Joined: 19 August 2010
Location: Deeside
Status: Offline
Points: 158
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Posted: 15 October 2010 at 9:36pm |
Could be worse.... could have no fans!!, As I see it, It need's all those output devices (32 - 16 per channel) because it's a 2400w amp, A QSC RMX2450 (for example) is half the power with half the output devices so you have two amp manufacturers two different amp designers same transistors used with the same idea you need a complimentary pair PNP 2sa1943 & NPN 2sc5200 per 150w i:e: 4 x pnp,npn (150w) = 600w total of 8 o/p devices 8x pnp,npn (150w) = 1200w total of 16 o/p devices 16x pnp,npn (150w) = 2400w total of 32 o/p devices according to OHM the reason is 'Many designers specify the
transistor compliment by the maximum that can be wrung from each
device, ignoring the fact that good behaviour is dependant upon
transistor-die area and sufficient heat removal.', Most manufacturers have there propaganda garbage to try and sell there product, Overall.........It's not an Amplifier Debate..........More Internals Please 
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DJ
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Big-G
Young Croc
Joined: 28 November 2006
Location: Naarfuk
Status: Offline
Points: 1141
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Posted: 15 October 2010 at 8:32pm |
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Thats even worse isn't it?
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They know what is what but they don't know what is what they just strut what the .
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"The" Amplifier Internals thread ...
