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Original Message
RE: 20B SET: look ma, no driver tubes
Posted by Donald North on February 11, 2012 at 21:01:09:
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.