Quote:
Originally Posted by Radio Wrangler
It isn't a wein bridge oscillator. The title is correct, it really is called a 'phase shift oscillator' which has always been a poor name because just about all oscillators have their frequency set by the phase shift of some network
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You are absolutely right on 3 counts:
1. it has too much gain, that bit is mentioned in the blurb - the main amplifier section has a 500k log pot to set input level.
2. it does operate over a small range 35 - 80 Hz.
3. it is a phase shift oscillator.
There is no mention of the missing value in the text I have read it several times over the years, it may be mentioned in a later edition as errata item. Assuming I have that edition, I think I do but would have to look.
Thought it would be quicker to ask.
The Phase Shift Oscillator drives a standard valve power amp using 807s with 450 volts DC at 200mA on the power line. It uses the common 450v supply to the 68K resistor.
The maximum screen current for an EF80 is 2.8 mA; maximum screen grid dissipation is 0.9 W.