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Old 15th May 2022, 9:54 pm   #9
Leon Crampin
Octode
 
Join Date: Nov 2005
Location: Surrey, UK.
Posts: 1,654
Default Re: Nordmende Globetrotter 808 output stage problem.

I would alter the circuit, very slightly, to ensure that the Vbe multiplier turns hard on when the wiper lifts off the track, or its slipring tarnishes. In some cases, a highish value fixed resistor connected base to collector of the multiplier will achieve this without adversely affecting the adjustment range. Re-calculating the circuit and wiring the pot as a rheostat in the b-e leg of the network is not difficult and may give a better range of adjustment.

Leon.
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