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RE: PING: Dr. LoMu/Tube Wrangler- Re High Mu tubes vs. Hi gain circits.

Everyone seems so intent on throwing way too complex theory or dissing Dr. Low to answer the question. The answer is, and please correct me if I'm wrong, that the plate resistance of a pentode is very very high (constant current) therefore, the effective plate resistance = the plate load resistor. If you do the computation for 10Meg in parallel with 50K, for example, the result is essentially 50k. So... not such a high resistance for the next stage after all. FWIW, I have put together a version of Thorsten's WE91 using a 6BQ5 driving a 300B (without feedback or the regulated power supply shown in Thorsten's design) and I find it to be a wonderful combination.
Live long and prosper!

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