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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: Driver Tube in Atma-Sphere MA1 MKII.2 posted by David M. on August 1, 2005 at 19:11:57:
No, the driver tube is NOT the only tube in the signal path. The tubes that comprise the dual-differential cascode circuit at the input of the amplifier are very much in the signal path, and in fact have a lot more to do with sonic qualities of the amp than does the driver tube. Four tube sections are required to construct the input topology, so two dual-section triodes are used, the 6SN7s. The input stage does all the voltage amplification; the driver stage does not supply additional gain. It converts the voltage output of the gain stage to a low-impedance current output to "drive" the output tube section. The dual-differential cascode is subserved by a constant current source (CCS), which greatly improves its performance, reduces distortion, etc. One might say that the CCS is "not in the signal path", but in my experience everything matters. The CCS is constructed using another 6SN7 in the MA1.
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Follow Ups
- Re: Driver Tube in Atma-Sphere MA1 MKII.2 - Lew 10:11:17 08/02/05 (5)
- not to belabor the obvious, but... - Jim Dowdy 12:54:15 08/02/05 (4)
- Re: not to belabor the obvious, but... - David M. 19:02:54 08/02/05 (3)
- Re: not to belabor the obvious, but... - Lew 06:10:33 08/03/05 (2)
- Re: not to belabor the obvious, but... - Legendre 18:04:23 08/05/05 (1)
- Re: not to belabor the obvious, but... - David M. 18:36:10 08/07/05 (0)
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