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Title: TW BUZZ AND NOISE PROBLEM Post by: gerard83 on May 08, 2008, 08:39:46 PM Hi,
i am french and excuse my poor english, i have build a tw express, it work very well,great sound ,power is good. but i have a problem ,it is not a buz, there is a noise like a oscillation , i see this noise on the scope and with no signal input there is a oscillation at 400 hz about. when the volume is at 10 or 12 there is a microphonic phenomen. tube is news ,bias is good (-30v) and when i touch the chassis with my hand the problem is down more 50%. Any wire is good ,and wire shield on first tube. wire heating is not problem. please help me i you have a idea on my problem Many thanks Gé from south france Title: Re: TW BUZZ AND NOISE PROBLEM Post by: pongo316 on July 08, 2008, 11:02:47 AM got picture of iside your amp sound like a ground , chech all wireing again
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