scott2000
Well-known member
I have a type of push pull limiter I picked up and the low frequency was creating some strange behavior from motorboating and chirping when the threshold was turned. . It's a modified Hammond pre amp/limiter....
Anyhow, the quick fix apart from getting some frequency limited transformers was to put some 100k resistors in parallel to the 1meg resistors that are on all 4 of the 6sn7 grids going to ground. This cut the low end pretty good but I was wondering and tried to put some pots in instead of the resistors so I can bring back some of the low end and maybe be able to balance things out a bit. I figured if I could put 4 pots total (1 for each grid) I'd be able to have more control over the frequency this unit is having to work with and play with the balance at the grids a little...... If that even sounds right....
Ok.... I'm dumb..... :-[
Can you just put 1 meg pots (pin 1 and 2) on the grids with a 100k in series on last pin of pot to ground?????
Do I need to worry about wattage ratings????? Other stuff??? I'll experiment....
unmodified schematic is attached....the 6sn7s are the same....
Let me know if you need more info....
Thanks!!!
Anyhow, the quick fix apart from getting some frequency limited transformers was to put some 100k resistors in parallel to the 1meg resistors that are on all 4 of the 6sn7 grids going to ground. This cut the low end pretty good but I was wondering and tried to put some pots in instead of the resistors so I can bring back some of the low end and maybe be able to balance things out a bit. I figured if I could put 4 pots total (1 for each grid) I'd be able to have more control over the frequency this unit is having to work with and play with the balance at the grids a little...... If that even sounds right....
Ok.... I'm dumb..... :-[
Can you just put 1 meg pots (pin 1 and 2) on the grids with a 100k in series on last pin of pot to ground?????
Do I need to worry about wattage ratings????? Other stuff??? I'll experiment....
unmodified schematic is attached....the 6sn7s are the same....
Let me know if you need more info....
Thanks!!!