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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 25th May 2020, 04:08 PM   #1
Dale Saukerson is offline Dale Saukerson
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Join Date: Jan 2019
Default SSE choose between 2 power transformers

I have previously built two headphone amps (non kits-one each tube and solid state) this will be my first speaker amp build. I have my SSE board in hand, the parts to populate will be here Tuesday. The output transformers will be Edcor GXSE15-5K not yet ordered. I will be using a Triad 200mA choke in the power supply along with a motor run cap (all on order). The speakers I do not yet have. I will be ordering some small bookshelf style speakers hopefully 3way to be run by the amp build in question. The source will be a turntable with built in preamp. All is to live in a small dining room for dinner music and maybe later to a small living room. I have not decided on what output tubes I will settle on but plan on building for the standard choices of EL34, 6L6 or KT88.

The Hammond 374BX interests me in that it has a tapped primary (I am 120v nominal). Many seem to be happy with this though a few complained they run hot. Others have used the Edcor XPWR035. The Edcor does have a larger overall size which may add to longevity.

My question (finally) from a heat or quality or longevity standpoint ignoring cost, which would be the better choice ?

I also fix antique radios and we are sensitive to heat in 80 year old transformers.
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Old 26th May 2020, 02:18 PM   #2
dwinstonwood is offline dwinstonwood  United States
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Hi Dale,
I'm using the Edcor XPWR035. After hours of running it only gets warm to the touch. The tubes are what put out the real, noticeable heat. And, yes, it is a very large PT! Here's a photo to give you a size reference.

Sorry, I can't comment on Hammonds.

David
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