Re: Tube bias settings and slight hiss in one channel

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In Reply to: Tube bias settings and slight hiss in one channel posted by oocela on April 21, 2007 at 09:35:08:

I doubt very much that the adjustments you have made would produce the hiss you hear. More likely would be the cleanliness of the tube pins/sockets, switches and/or circuit layout. The most important consideration will be the bias adjustment. Please measure the DC voltage from each of the EL 34 output tubes at pin 8 to ground and report back. If pin 8 is grounded, then purchase a half dozen 10 ohm/ 1/2watt resistors from Radio Shack, match 4 as closely as possible and install them between pin 8 and ground for all four output tubes. Then measure the DC voltage between pin 8 and ground and report back.

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Topic - Tube bias settings and slight hiss in one channel - oocela 09:35:08 04/21/07 (3)

Re: Tube bias settings and slight hiss in one channel - Ian L 20:03:14 04/23/07 (0)

You have not properly adjusted your amp - anumber1 11:55:13 04/21/07 (0)

Re: Tube bias settings and slight hiss in one channel - corerosin 11:37:45 04/21/07 (0)

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Re: Tube bias settings and slight hiss in one channel - corerosin 11:37:45 04/21/07 (0)

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