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Amp Internals 2

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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2019 at 3:38pm
Electro-Voice Q99, aka Dynacord SL1800.
Smoke fluid, beer, fine wine, who knows but it doesn't like it up it.



Edited by kedwardsleisure - 01 August 2019 at 4:51pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 11:38am
Another lovely old skool (MOSFET) amp:-














1Kw of real power - and made locally:-






These amps seem to go on forever. This one just needed a good clean - one pot replacing...   Smile



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Post Options Post Options   Thanks (0) Thanks(0)   Quote bruce@bluff Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 1:16pm
OOH ultra high velocity that's a new one
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 1:27pm
A new one on me too. Looks like someone saw the front panel on an HH V800 and copied it.  Not seeing how that fan on the back is cooling those heatsinks on the sides though?
Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 2:02pm
Originally posted by bruce@bluff bruce@bluff wrote:

OOH ultra high velocity that's a new one


Haha, yes - but MOSFETS are supposed to be "faster" than BJT´s...   LOL


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 2:06pm
Originally posted by jbl_man jbl_man wrote:

A new one on me too. Looks like someone saw the front panel on an HH V800 and copied it.  Not seeing how that fan on the back is cooling those heatsinks on the sides though?


Yes - the design/look is a definite copy of HH, Studiomaster, etc, etc. The fact is that it is still going strong after maybe 40 years of service - and sounds good as well.   Smile

The fan:-  maybe there to keep the transformer cool...   LOL


EDIT: And 10 devices per side is how it was done when amps were amps.  Smile   Today they stick 3/4 per side and call it 5000W!  Ouch Confused Ouch



Edited by Earplug - 13 August 2019 at 2:08pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TMH Music Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 8:58pm
Looks like our good old friend the classic J50 K135 Hitachi mosfet design. I think Ramses the third had one of these and it’s still going strong!!! Bomb proof amp design!!!
Nothing is foolproof because fools are so ingenious
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bruce@bluff Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2019 at 6:49am
And I will take one these any day over modern class d rubbish. Just got myself 2 x BGW7500 that where going to get thrown away still working perfectly after 40years may need a recap though
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2019 at 8:56am
^ Completely agree with the above comments, show me one of these modern amps that will still be working after 40 years. Can you imagine in year 2059 trying to fix a 40 year old Powersoft? LOL 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TMH Music Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2019 at 12:21pm
Originally posted by jbl_man jbl_man wrote:

^ Completely agree with the above comments, show me one of these modern amps that will still be working after 40 years. Can you imagine in year 2059 trying to fix a 40 year old Powersoft? LOL 

Too true sir, add trying to repair the Powersoft to the list of recreational impossibilities!!!
Nothing is foolproof because fools are so ingenious
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bruce@bluff Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2019 at 12:34pm
Here's the plan chaps, find a non working powershite rip out all the insides, find a transformer that will fit in a 2U case install 2 x Autona AL125 modules close it up and give it back to the client and see if he notices the difference, problem solved       
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bruce@bluff Quote  Post ReplyReply Direct Link To This Post Posted: 14 August 2019 at 12:37pm
OH and I forget to add that modification should work for another 40 years
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