The Amp Garage

If you had engineered at Bell, they would have been wired right, and that 400Hz inverter squeal wouldn't be in the headsets.

The local mall carries a nice clear SPF from New Zealand.
No knots, good grain, makes good cabinets.

We laced all wires in aircraft tailbooms but I don't want them closer than necessary in an amp.

didit wrote: ↑Tue Mar 19, 2024 9:29 pm Series connected pairs run well on 12.6V.

..

Fair point!

I have Mullards and an odd Telefunken that flash. Decades of use with no issues. The plate voltage issue may be a small brown out or dip in the line voltage. A small line voltage change percentage wise shifts B+ up or down a fair amount.

Power tubes like 6 Volts.

Well it doesn't matter a great deal on low gain builds. As more stages are used, the hum/noise floor increases, requiring adoption of these strategies up to a full D.C. heater supply for preamp tubes.

Elevating fights hum by eliminating hum induced in the cathode by the heater.
Twisting reduces hum by reducing radiated hum, by
, as RJ said, antiphase nulling, capacitance to ground, etc.
So both strategies combined will give less hum.

A choke input filter should have a very small cap at the input to keep a small voltage on the inductor between cycles to avoid a complete collapse of the magnetic field, and the attendant noise from the current dump.

I wonder what freight would cost?

Really, the tone relies on 2 picoFarads? Your ears are better than mine Miles.

Oh the humanity!

Still, not great engineering.

Seems like mathematicians abandoning exponents. At least there not using Ångstroms.

Oh, I agree with ya there. Measuring larger distances, especially without my bench glasses, would be headache inducing.