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In Reply to: ECC34 posted by Arthur on October 19, 2002 at 15:05:50:
If you just plug in an ECC34 into your M60 in place of the 6SN7, it is not at all clear what the resulting grid bias voltage will be. You quote apparently from a tube manual some "typical" operating points, but in the M60 these values are not at all likely to be relevant. If you can actually measure the resulting grid bias on an ECC34 in a stock M60, someone will be able to answer your question. Are you using the ECC34 both as the dual-differential amp AND as cascode? (This would require a pair of ECC34s per chassis.) Anywhere from -2V to -5V bias at the grids of the dual-differential amplifier sections should be fine. Also, the CCS in the cathode of the dual-differential amplifier holds current relatively "constant", so there is less or no danger of the grid going positive or of resulting "thermal runaway", where the current goes sky high and could destroy the tube.
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- Re: ECC34 - Lew 10:35:53 10/25/02 (0)
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