In Reply to: 20B SET: look ma, no driver tubes posted by Frihed89 on February 11, 2012 at 14:02:28:
I've considered building a single stage amp with their 20B. With its 3.3k plate impedance, it needs a 10k primary impedance output transformer. 10k:8 ohm yields 35:1 step down ratio. The tube has a mu of 20. So you need some form of input gain, be it another tube or input step-up transformer to achieve unity gain, let alone positive gain.
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Follow Ups
- RE: 20B SET: look ma, no driver tubes - Donald North 21:01:09 02/11/12 (4)
- RE: 20B SET: look ma, no driver tubes - Tre' 22:06:03 02/12/12 (3)
- RE: 20B SET: look ma, no driver tubes - Paul Joppa 08:58:39 02/14/12 (2)
- 801A here - gluca 10:22:19 02/14/12 (1)
- Yep, Good Ole Brian Clarke... - RC Daniel 00:42:40 02/16/12 (0)