Tube DIY Asylum

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RE: not buying it

Posted by Ralph on August 2, 2007 at 13:10:55:
The 'LTP' (an antiquated term at best) can be set up very nicely in 6B4/2A3 amplifiers as the bias voltage on the power tubes has to be rather negative due to the low Mu of the tube. You can use the same supply for the bias as the cathode resistor of the differential amplifier. Its just a matter of working with the divider networks.

Makes for a lot simpler circuit, and you can get the same gain as the rat's nest driver in the RCA schematic.