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Old 15th November 2011, 02:35 AM   #1
kkcinc is offline kkcinc  United States
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Default 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?
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Old 15th November 2011, 03:58 AM   #2
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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....
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Old 15th November 2011, 12:05 PM   #3
kkcinc is offline kkcinc  United States
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I don't think it is hot enough to burn me, but I'll try it.
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Old 15th November 2011, 12:51 PM   #4
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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.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 15th November 2011, 01:40 PM   #5
kkcinc is offline kkcinc  United States
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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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Old 17th November 2011, 10:36 PM   #6
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what are some cooler running trafo brands that can be used for tubelab SE?
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