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M-3500 Upgrade
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miroslav
Miroslav Music - YouTube
"If it sounds right, it is right!"
03-01-2010
sweetbeats
Reel deep thoughts...
Join Date: Apr 2008
Location: Pacific Northwest, USA
Posts: 4,279
Rep Power: 1059333
Quote:
I didn't try to soak it through the pot shaft but instead tried to soak it through what I think might be a small
but accessable gab between the plastic body and the metal cover.
Ahhh...I see. The pots are different. That looks like a good spot...wherever you can get the cleaner in without going
through that shaft is good methinks. Miroslav has got the goods with what he is saying AFAIC.
I still would probably be jetting the cleaner in however I can tho'...it'd make a mess but just leaving time for
everything to dry.
Quote:
I don't know if I read that thread. Did you desolder and open the pots
Oh no-no-no. Only if I'm repairing a pot. I'll fnd that thread so you cxan at least see what I'm talking about.
Quote:
You said the board might be loaded with 5532s but I couldn't find them. All I found were JRC 4558D
Seriously? So you look at all those 8-pin dip chips on the channel strip and they are all 4558's?? The 4558 was a
reliable workhorse predecessor to the 072...just more self-noise, distortion, and "slower", but I'd be REALLY suprised
if that was true that that is what the board was loaded with...the 4558 went out of common use in the Tascam boards
in the early 80's and was replaced byt the 072 and then the 5532 in their higher end boards...the M-300 boards were
loaded with them and they predate the M-3000 boards by years...
Huh...
Quote:
I finally got around to measure the voltages of the PS-3500.
nominal | measured
==================
+15,00V | +14,96V
-15,00V | -14,99V
+12,00V | +11,87V
+08,00V | +08,04V
+48,00V | +47,89V
Lookin' good BUT measuring the voltage is really only going to reveal if there is a catastrophic issue with a rail...the
oscilloscope reveals the truth.
Do you have an HF filter on your scope and do you have a ground clip for the probe?
03-01-2010
sweetbeats
Reel deep thoughts...
Join Date: Apr 2008
Location: Pacific Northwest, USA
Posts: 4,279
Rep Power: 1059333
cleaning pots
My wacky pot-cleaning thread. Take what you want and what works and leave the rest behind.
03-01-2010
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