500k audio pot for treble?
Moderators: pompeiisneaks, Colossal
500k audio pot for treble?
Has anyone tried a 500k audio pot for the treble control? It seems my order got lost so it's going to be a week before I can get any new pots. I'd kinda like to finish my Express build this weekend and I'm short one 1MA pot. I've heard that these amps are very bright anyway. Anyone? (Otherwise, I guess I'll just have to be patient.)
Re: 500k audio pot for treble?
I think 500K won't make it less bright. Mostly it affects the midrange tone.
In fact I think your impression would be that it's brighter with a 500K vs. 1M. With 500K, the frequency cutoff for the midrange scoop is higher in frequency. So when you turn the treble all the way down, the cutoff frequency you are adjusting with the treble control is higher with 500K than it is with 1M. I would think you'd find it fairly brighter with the 500K vs. the 1M.
FWIW my Princeton Reverb with express-type preamp was unbearably bright with the Fender-spec 250K treble pot. 1M is a bare minimum. I even had to adjust the slope resistor to like 33K to tone it down, as well as adjusting the .002uF "ken cap" to .0033uF, and I still run it with the treble all the way on 0 the vast majority of the time. I might put a 1M resistor in series with the treble knob next time the amp's opened up. It's still wickedly bright.
In fact I think your impression would be that it's brighter with a 500K vs. 1M. With 500K, the frequency cutoff for the midrange scoop is higher in frequency. So when you turn the treble all the way down, the cutoff frequency you are adjusting with the treble control is higher with 500K than it is with 1M. I would think you'd find it fairly brighter with the 500K vs. the 1M.
FWIW my Princeton Reverb with express-type preamp was unbearably bright with the Fender-spec 250K treble pot. 1M is a bare minimum. I even had to adjust the slope resistor to like 33K to tone it down, as well as adjusting the .002uF "ken cap" to .0033uF, and I still run it with the treble all the way on 0 the vast majority of the time. I might put a 1M resistor in series with the treble knob next time the amp's opened up. It's still wickedly bright.