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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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Join Date: Oct 2015
Location: Nawth-Side o'the Rivuh
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.

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