Ron Worley wrote:Obviously, it's electrically immaterial, but I will check it out and correct if it's backward..... it very likely that you are right!!
Ultimately, my best contributions tend to be immaterial.
Guys... new to the forum here but I was wondering if it possible to just remove two of the El84s from the circuit... would to do this require one to change all the rest of the circuit due to voltage shifts etc?
Thought this might give one a lower wattage amp?
Thanks
Tony
Seems like the labeling of V5 and V6 should be switched around in the schematic. As it is, one side of the OT primary goes to V4 and V6, and the other side goes to V5 and V7.
Precisely! It is a cathode bypass cap and would go in parallel with R7. It allows AC coming through the tube to pass to ground. Thus, not allowing it to mess with with bias of the tube (e.g., cutting off too soon).
Do note that polarity is important if using electrolytics in this spot. + end goes toward the tube. - end to ground.
Cathode bypass caps also represent an excellent tone shaping tool. Higher values produce a more low end rich tone. Lower values the opposite.
fayser wrote:Guys... new to the forum here but I was wondering if it possible to just remove two of the El84s from the circuit... would to do this require one to change all the rest of the circuit due to voltage shifts etc?
Thought this might give one a lower wattage amp?
Thanks
Tony
Most just call that a half-power mod - some do it by separating the cathode bias resistors and lifting the ground connection on one pair. True, it will make a subtle difference in voltages - up to you if it matters.
You could make a half power (18 watter) or 30 watter with a switch - if the former, you won't have the "correct" trannie set (since Ken never did it that way).