Vintage Synth Repair

Ron is right, mechanical noise from the power supply is usually 
caused by loose transformer mounting screws. Sometimes the 
laminations on the transformer itself loosen and get noisy. Assuming 
that it is a 2600 power supply---There are four screws on the 
transformer case that you should try tightening. I would also check 
the power supply board for bad solder connections too. 


Regards,
John Hannon
(ARP factory tech 1975-1981)




--- In vintagesynthrepair@y..., "Ron Lake" <electron@b...> wrote:
> Hi Ethan,
> 
> You will probably find that the 'noise' (if you mean actual sound 
rather
> than instability of supply), is caused by the
> transformer. Check the transformer mountings for security and 
tighten down
> where required. This may help.
> 
> Regards,
> 
> Ron.
>   -----Original Message-----
>   From: ethanzer0 [mailto:ethanzer0@y...]
>   Sent: 27 June 2002 19:47
>   To: vintagesynthrepair@y...
>   Subject: [vintagesynthrepair] Repairing power supply.
> 
> 
>   I have an old +/-15v .5A power supply that is very noisy and I
>   suspect it is in need of servicing; potentially a rebuild.  Does 
and
>   body have experience doing this kind of thing?  I have schematics 
and
>   a service manual and my scope should be here monday.
> 
>   Any help will be greatly appreciated.
> 
>   Thank in advance,
> 
>   Ethan
> 
> 
>   To unsubscribe from this group, send an email to:
>   vintagesynthrepair-unsubscribe@e...
> 
> 
> 
>   Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service.