Tube Rush and Tube Hiss Different Channels

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I have a somewhat exotic preamp with DHT 71a tubes as power tubes and a duo of C3G Siemens driver tubes plus rectification and regulation tubes. Made in Japan. I'm getting normal tube rush in the left channel and an odd, shrill tizzy noise in the right channel. The noise in the right channel isn't audible except when I use my tuner. All other line sources are fine. There is a hum adjustment on the preamp but that isn't corrective. Any ideas why this is happening or should I just forget about it? I have rolled different 71a tubes but that makes no difference. The Siemens tubes are very expensive and long lasting.

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Topic - Tube Rush and Tube Hiss Different Channels - Berrell88 06:38:19 02/21/23 (3)

RE: Tube Rush and Tube Hiss Different Channels - Palustris 07:12:27 02/22/23 (2)

RE: Tube Rush and Tube Hiss Different Channels - Berrell88 16:09:07 02/22/23 (1)

RE: Tube Rush and Tube Hiss Different Channels - 6bq5 12:07:13 02/27/23 (0)

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