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It may be magnetostriction, which is a normal noise caused by the vibration that occurs in an output transformer due to the magnetic field produced by the signal. Normally you don't hear it because the speaker volume masks it, but when playing into a silent load it becomes audible.

Has anyone mentioned Reaper?

Note that we are talking about two very different things here, balance in normal operation, which is designing the circuit for equal amplitude signals on the two outputs when the PI is npt overdriven, and duty-cycle balance when the PI is overdriven, to prevent asymmetrical drive to the output...

It reduces the amount of duty-cycle modulation that occurs when overdriving the phase inverter. Typically, values in the range of 330k to 390k give the best results, but 470k may be enough. It will not affect the normal, non-overdriven PI balance of the two sides. Duty-cycle modulation...

Purple.

High altitudes are also bad for electrolytic capacitors. They can fail if transported in unpressurized cargo holds, or if they are used in certain avionics equipment where they are subject to high altitudes. There are special hermetically sealed bulk capacitors that are used in military aircraft.

Tube amps have built-in heaters. Not only do they sound great, they keep you warm and toasty all winter long. Modeling amps, on the other hand, not only sound cold and lifeless, they don't care if you freeze to death. All kidding aside... Most electrolytic capacitors are rated in the -40C...

One thing to note: just because a tube is microphonic doesn't necessarily mean you have to throw it away. Microphonic tubes can sometimes live long and productive lives in other tube positions, most notably, in the phase inverter. You can try swapping tubes around to find the worst and...

Purple tolex has the best tone.

https://www.amazon.com/Chemtronics-Flux-Off-Concentrate-Remover-Aerosol/dp/B01N2KD6I9/ref=mp_s_a_1_5?keywords=flux+off&q

It's not a great loop. It has a buffered send, but no buffered return. The signal is high-level coming off the cathode follower, so it will be too hot for pedals, but might be okay for line-level rack unit. Since it doesn't have a buffered return amplifier, the drive to the output will be...

A TRS effects loop allows use of a standard TRS insert cable that has a 1/4" stereo jack on one end and two 1/4" mono jacks on the other end. It saves one cable. I used single-jack TRS insert FX loops on my Sabre and Intruder amps because I hated having to run two cables for each loop...

It looks like a TRS insert loop/preamp out to me. The electrolytic capacitor is for DC blocking of the high-voltage on the cathode. It is a large value so there is no low-frequency rolloff when driving a low-impedance (10k-100k). The cathode follower output signal goes to the tip, the return...

I just purchased a floor monitor from Sweetwater and...NO ATOMIC FIREBALLS!!!!! I may have to have to start shopping elsewhere, this is unacceptable.

Purple tolex sounds best.

Dirty contacts on an effects loop jack can cause volume fluctuations. This can be tested by plugging a cable between send and return.

You don't know expensive until you try to start your own amp company. I'm sure I have the most expensive amp in the world sitting on my bench gathering dust. The best way to make a million dollars? Start with two million and open an amp company.

If the new bean counters stop sending Atomic Fireballs with my orders to improve the bottom line, they're dead to me.

My Tele is orange with cream binding and a strat-style beveled back. It started rocking when I routed it out for two humbuckers.

"J-B Weld - works on anything, even guitars!"