PURE M3700 Bedienungsanleitung PDF herunterladen (Seite 19)

#15

I read that those chips were/are very cheap so they were used almost everywhere. So an upgrade should always

improve things. In believe JRC used 4 digit date codes on the chips in the 80's and most had a "shiny" finish but my

op amps have a matte finish and a 5 digit code with the fifth digit being a letter. I know that changed from the 80's to

the 90's at least with the "original" 4558D (which I mistook my 4580Ds for) and their reissues in the 90's.

Quote:

Originally Posted by sweetbeats

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?

I don't have an HF filter. Are you talking about the ground clip that's attached to the probe? I clipped that to the

corresponding 0V rail when measuring. The first 0V rail is for +/-15V, the second is for +12V and the third is for

+48V an +8V. Is there another spot where I should get my ground? Now that I think of it, back in the days when I

serviced my tube amp I always clipped the ground to the housing and did the probing. Don't know why I did it

different now. Maybe I'm just a little out of practice...

Cheers

Tim

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03-02-2010

timkroeger

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Quote:

Originally Posted by miroslav

I take it you have a schematic...or are you working "blind".

Hey miroslav, yes I have the schematics. It's a printed version of a PDF which I got from German Teac support. I was

a little disappointed by the quality but it's better than nothing. I sent a PM to Studio Dweller at gearslutz forum

because he mentioned he wanted to sell his M3500 with manual and such and I asked him if he would part with the

manual if it is an original version. So far I have not received an answer.

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PURE M3700 Bedienungsanleitung Seite 19