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Old 23rd June 2013, 02:34 AM   #51
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Originally Posted by Mihkus View Post
The hum can be caused by crap wires to chassis RCA or what ever connector you use..
Fully shielded audio wiring,

Hum could be from several sources; bad design, bad layout, wiring, poor components, poor grounding [most likely].............

If you have the time and interest, I'd suggest re-working the ground connections, then the wiring
Getting back into business, though non-audio related. Have excellent contacts for NEW [OEM] Russian and Chinese tubes. Custom chassis, and parts [MOQ applies]
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Old 23rd June 2013, 03:47 AM   #52
redjr is offline redjr  United States
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Originally Posted by KMossman View Post
I doubt I would buy from 'him'; the weight is wrong, no specs, no description, no specifics, and nothing to suggest he knows electronics
Something is fishy there for sure with that picture. I was going to buy the 2030 amp kit just for the case alone, but now I'll pass on it altogether after activexp's experience. I've got enough little amp modules to keep me busy for months and a move in 60 days. Things are getting nuts around here. There are much better foreign vendors to deal with and better products too.
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Old 23rd June 2013, 08:07 AM   #53
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Originally Posted by csom View Post
Sir, could you please try what I suggested at post# 38 ?
Yes I have tried that, thanks. Unfortunately it made no difference
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Old 23rd June 2013, 11:49 AM   #54
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Originally Posted by activexp View Post
Yes I have tried that, thanks. Unfortunately it made no difference
Sorry to know.

The preamp/ tone control section usually needs a ripple free, dual regulated power supply. Even a very basic 7815 and 7915 regulator based PSU can fix the hum problem. But that requires some extra modding.

Anyway, all the best.
Warm regards, Som
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Old 23rd June 2013, 01:00 PM   #55
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If you look closely, the "Vacuum Tube Amplifiers" for $25.27 is in the Books section, it's a book about Tube Amps.
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