bias setting

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I recently received an Image 34i integrated amplifier (a great sounding amp!)powered with EL-34 tubes.

After a week, I asked a friend to install RFT EL-34 tubes and to set the bias in accordance with the manual (recommended setting is 0.35 - 0.5V).

Today I decided to replace the RFT tubes with used Mullard EL-34 tubes (twin halo getters, xf2 coded), but two of these tubes show low voltage (0.26V and 0.16V, though I turn the adjustment screw clockwise as far as it would go), while other two tubes are stronger.

Does it mean that two of the four Mullard tubes are "low"?

When I tried them with the Cary SLI-80 integrated amp (where the bias is set in milliamps (0.65mA in this particular case), not V), there was no such problem (MAs are quite different).

I will appreciate any comments.

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Topic - bias setting - tubers 15:25:30 06/26/08 (4)

RE: bias setting - Lowrider 01:24:46 06/28/08 (0)

RE: bias setting - FenderLover 23:09:26 06/26/08 (0)

RE: bias setting - akolegov@mtu-net.ru 22:11:38 06/26/08 (0)

RE: bias setting - Caucasian Blackplate 16:40:41 06/26/08 (0)

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