No problem, glad to help out. Definitely Google the 6V6GT data sheets. FWIW, the 6V6GTA is the same tube but is rated as a 14W tube for maximum dissipation. The 6V6GT is only rated at 12W. The "A" designator means slow warmup for use in tube equipment that runs the filaments of the tubes in series. (Filaments are wired in parallel in the 5F1.) The 'GT is identical to the 'GTA except for the "A." The 14W vs. 12W discrepancy is due to the way the tube industry rated the tube. You'll need this number if you want to check the bias of your 6V6 tube. Be aware that the JJ/Slovak 6V6S is not really a 6V6 tube, it can dissipate up to about 18 watts or so so it is more like a metal 6L6 or 6L6G in terms of power dissipation.Originally Posted by red
The bottom line is that some 6V6 tubes can be biased up to 14W with no problems, while other will over dissipate ("red plate") and will have to be biased down to 12W.
RG Keen has forgotten more about electronics and tube circuits than I'll ever know, so I will defer to his judgment on thisOriginally Posted by red
That meter should be fine. When measuring the B+ or any other high voltage DC use the 600V setting set for DC. If you want to measure the raw AC coming out of the PT, use the 600V setting set to AC and measure from one end of the high voltage lead to the center tap. Don't measure across the entire HV winding or you might burn out the meter.Originally Posted by red
To measure cathode voltages, set the scale to the nearest appropriate voltage level on the DC setting. There is about 1v on the 12AX7 cathodes and about 20V or so on the 6V6's cathode.
You might want to get a set of retractable hooks for the meter. One for the black and one for the red lead. You can hook up the black lead to ground and then measure the voltages with one hand. Put the other hand in your pocket or behind your back as a safety precaution.
Thanks for the link, I had not seen that site before.Originally Posted by red