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Old 23rd May 2012, 04:00 PM   #11
diyAudio Member
Join Date: Apr 2003
Location: stockton on tees
hi, lost in translation, it's 2.2 uf.

I sent the pics to DaDa europe and he reckons that although a lot has been replaced I would be better off following their kit values.
I will be using cd into the tape board so there won't be a lot to do.
Power supply increase and changes to the tape board.

Last edited by j baldam; 23rd May 2012 at 04:03 PM.
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Old 31st May 2012, 12:18 AM   #12
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Join Date: Apr 2003
Location: stockton on tees
hi, I have had some interesting advice from DaDa Australia.
He pointed me towards a mod on the power supply.
Basicly you remove all parts from the power board except the transformer.

Two diodes are added for rectification.
A 12v reg is fitted and a 2200uf cap and 100uf cap and a link across c504.

I have done this and the results with CD into the tape board are outstanding.
This has impessed me so much that I have called it a day with modding.

I am now rediscovering my old CD's.

Link here
Quad Spot
Click the image to open in full size.
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Old 31st May 2012, 08:01 AM   #13
sbrads is offline sbrads  United Kingdom
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Location: Kent, UK
Originally Posted by Huntingdon 361 View Post
I am mystified as to why anyone would want to put that sealer/glue on the boards.
Perhaps whoever rebuilt it was used to military PCB construction methods. If it's the real deal you will be able to solder/unsolder through it and heat will soften it enough to lift components.

Last edited by sbrads; 31st May 2012 at 08:06 AM.
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Old 31st May 2012, 08:05 AM   #14
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When doing the mods I have removed some "glued "parts.
It looks like all the new bits were glued into place, then soldered.

I can only think he wanted the board assembled before soldering in one go
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Old 31st May 2012, 09:55 AM   #15
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As sbrads menetioned, glueing stuff to the PCB is what is done in military/aviation (at least they used to do it, don't know if it is still done). Some PCBs were even casted into epoxy, a one way only solution. It makes sense for electronics in a high vibration environment, but I don't think it has benefits for a pre-amp.
An FFT of my life would show a couple of peaks and some low level harmonics, but mainly random noise.
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Old 31st May 2012, 06:21 PM   #16
sbrads is offline sbrads  United Kingdom
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Glueing is still done in military gear, but usually it's only big wobbly components that get bonded down, all the small stuff just gets conformally coated (like a varnish that you can solder through for repair work). If there's a heatplane (a flat metal plate with holes for component leads bonded to the topside of the pcb), then ICs and 'laying down' components may get a heat transfer compound under them, usually a liquid that sets, for cooler running.
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