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Old 24th September 2004, 03:22 AM   #11
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Bill, that just makes too much sense!! thanks
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Old 24th September 2004, 03:28 AM   #12
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Quote:
Originally posted by Upupa Epops
or never switch off .
That is actually a very good advice. Why would you like to switch off the preamp anyway?
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Old 24th September 2004, 03:53 AM   #13
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to conserve! just kidding, I know this thing doesn't draw enough current to concern me. I like things to work properly before I hack them up. 'Just that I bought it and it doesn't function up to my expectations is a peave.

Update- the problem seems to stem from the tone controls. When powering down with the tone defeat switch off (tone controls active) the offset is much lower, it peaks for a second at 430mV instead of the 5V I was getting with the tone controls disabled.
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Old 24th September 2004, 10:04 PM   #14
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I wonder if I just bypassed the tone control stage all together if this thing would work properly. I don't like the sound as much with the tone controls active, it sounds noticeably more detailed with the tone controls disabled.
In the tone control section there are a couple ic's (look like op amps) witht the numbers scratched off them , I wonder what they are.
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Old 24th September 2004, 11:20 PM   #15
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It is little bit like in story about fox and vine bunch : " I don't like it, 'cos is acid ! " and changing cause to result . Why do you have preamp with tone controls, if they lower transpareny ?
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Old 25th September 2004, 02:04 AM   #16
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Because it came that way. I bought this unit out of curiosity, and, for the most part, am pleasantly surprised. My other preamps are a Dynaco PAS2 which I tore all control circuits out of and a passive pre.

I'll bypass the tone control circuitry as soon as I get a chance, if the problem at power down remains it'll be easier to track down.
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