Finished Tubelab simple se and it sounds great. Using kt88's, transcendar 3k opt's, 4ohm tap, 560 cathode resistor, negative feedback, tube rectifier and ultralinear. B+ is exactly 440vdc. Allied 6K7VG seems to run hot. Not hot like the tubes, but hotter than the transformer on my 60wpc factory pp kt88 amp. Is this normal? Did I make a mistake going cheap on the PT?
do the 5 second test, if you can hold on to the traffo with your bare hands for 5 seconds without feeling burned, then it is probably not an issue....
The Allied is made by Hammond and like all Hammonds it runs hot. In your set up the transformer will be unconfortably warm. I have been running mine with 470 ohm cathode resistors and KT88's (not recommended). It gets too hot to touch after an hour of use, but it is still kicking after 5 years. So are the original tubes.
The Hammond 200 series gets about as hot as the Allied. The 300's run a bit cooler (not much) but cost more.
The Hammond 200 series gets about as hot as the Allied. The 300's run a bit cooler (not much) but cost more.
Thanks, that is good to know. I just measured the surface temp after about an hour. 123F/51C degrees. Not as hot as I thought.
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