#2
I wanted to check the voltages to see if something might be wrong with the PSU and almost all voltages (-15, +15,
+12, +8, +40) were off (lower) by about 40%! So I checked my multimeter - a cheap Renkforce DMM 1900 - by
just plugging it into the AC outlet. Surprise! Same 40% off. So... it could be I need a new meter, or I need a new
battery. But how to measure the battery when you don't have a working multimeter lying around OR some batteries
left? The battery passed the tongue test, but I'll get some new batteries and hopefully it's still functional. Otherwise
I'll be on the lookout for a cheap fluke (110 anyone?) or an old bench meter like the 8050A. What do you think?
I've put up a site where I post photos and information like what capacitors might need replacing and will also try to
update this thread accordingly. I've added a list of what caps are used in the PS-3500 power supply, too and I will
post my voltage readings and o'scope graphs when I'm measuring ripple.
Cheers
Tim
__________________
http://tubegeek.de
02-28-2010
miroslav
Cosmic Cowboy
Join Date: Jul 2009
Posts: 2,421
Rep Power: 5500053
Keep us posted, Tim (or at least me and anyone else that has a 3500 )
The dust/dirt in the PS is kinda nasty (I've cleaned out mine - I have two, one is a spare), but I will be curious if you
actually end up doing and component replacement on a large scale.
I just had the board all apart over the holidays...spent a few days cleaning each 4-channel module, and trying to
spray-clean the pots from the inside, as spraying from the top is a messy waste of time. I actually dabbed on the
DeOxit to each pot, and let it soak in rather than spraying. It was not messy that way, and it appears the DeOxit
managed to soak in-between the edges of the sealed pots.
Did the same with the Master bus section.
I got some spare modules and variety of parts that I acquired from a guy who broke up his 3500 not too long
ago...but I'm curious about the need for actual component replacement, like re-capping stuff.
Everything works fine on mine, so I'm not quite ready to start re-capping, but I know some people do it just to
"improve" sonic characteristics...though it's a LOT of work. There are a LOT of caps in one channel!!!
I think only some are critical for the sonic value - not sure which ones.
There was a guy on the Internet that I came across awhile ago (probably could find him again if I Google enough). I
think he was in the NY area.
He completely rebuilt his 3500...all high-Q caps, ICs...yada, yada, yada...but it cost him a fortune...both time and
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Kommentare zu diesen Handbüchern