Allied Transformer Runs quite Hot

kkcinc · 15th November 2011, 02:35 AM

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?

Tony · 15th November 2011, 03:58 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, 12:05 PM

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

tubelab.com · 15th November 2011, 12:51 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, 01:40 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, 10:36 PM

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

15th November 2011, 02:35 AM	#1
kkcinc diyAudio Member Join Date: Oct 2011	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?

15th November 2011, 03:58 AM	#2
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	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.... __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

15th November 2011, 12:51 PM	#4
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	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. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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15th November 2011, 12:05 PM	#3
kkcinc diyAudio Member Join Date: Oct 2011	I don't think it is hot enough to burn me, but I'll try it.

15th November 2011, 01:40 PM	#5
kkcinc diyAudio Member Join Date: Oct 2011	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.

17th November 2011, 10:36 PM	#6
PreSapian diyAudio Member Join Date: Sep 2009 Location: seoul	what are some cooler running trafo brands that can be used for tubelab SE?

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