Rangemaster Q

[MartyB]

Building my second rangemaster.  My first was RG's Austin Treble blaster.  With the present one, I avoided using stock resistors and put a 250k pot where the 68k resistor goes normally. Tweaking the pot I found a resistance of 88k gets me the optimum between blatty and thin.  It also happens to be the loudest result out of this effect.  Can anyone tell me if a correctly-biased germ. in this circuit would generally also give (or be expected to give) the loudest volume??

[petemoore]

Read GEO tech of Rangemaster.
 The Rangemaster transistor collector is 'supposed' to be biased at 7/9th's of the PS voltage or 7v with 9v supply.
 Set the pot where it sounds good to your ears, and compare it with the 7/9th's setting, then decide where you want it...or use a surface mount pot so you can tweak it at will. Ge's have a tendancy to bias drift much more than Si's.

[MartyB]

Thanks Pete.  '8)'

[Fret Wire]

If it sounds good at a different bias than the 7v, by all means keep it, like Pete said. When you ears and your DMM disagree, go with your ears.