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kkcinc 15th November 2011 03:35 AM

Allied Transformer Runs quite Hot
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?

TonyTecson 15th November 2011 04:58 AM

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....

kkcinc 15th November 2011 01:05 PM

I don't think it is hot enough to burn me, but I'll try it.

Tubelab_com 15th November 2011 01:51 PM

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.

kkcinc 15th November 2011 02:40 PM

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.

PreSapian 17th November 2011 11:36 PM

what are some cooler running trafo brands that can be used for tubelab SE?

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