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victorm 6th September 2012 12:42 PM

TSE - Edcor XPWR131-240 buzz
Hello guys,

Just completed the TSE, works really well, but unfortunately I am a little disappointed in the EDCOR PT (XPWR131-240) - there is quite a noticeable mechanical buzz...Not loud but noticeable. I have tried tightening the screws but the buzz is still there ;-(

Has anyone had this issue?

Appreciate any feedback,


Evenharmonics 6th September 2012 02:36 PM

I've had that issue with Hammond power transformer on my TSE. Try this thread.

I replaced the PT with toroidal type and got rid of the buzz from my TSE. YMMV

victorm 7th September 2012 01:18 AM

Thanks Evenharmonics. I've heard that too. Guess what I am trying to understand is whether or not ALL EDCOR PTs do that or I just got a faulty unit... Could you recommend a reliable source for a toroidal PT ?

Evenharmonics 7th September 2012 02:51 PM

This is where I bought mine from. It had to go through some diy modification though.

boywonder 7th September 2012 03:51 PM

Victor: FWIW I've built my TSE with the XPWR131-120 and I have no buzz issues......

victorm 9th September 2012 07:12 AM

Thanks guys,
Evenharmonics -appreciate the info ;-)
Boywonder - are you using 300b or 45's in your TSE?
Have a feeling I am overloading the PT. With 300b biased at 65 ma it looks like I am drawing close to 200 ma from the secondary (XPWR131 is rated at 175 ma). The PT is getting quite warm after a couple of hours. Have sent a question to Edcor.

boywonder 9th September 2012 08:16 PM


Originally Posted by victorm (
Boywonder - are you using 300b or 45's in your TSE?

I have two TSE's, one running 300B's at 60ma and the other running 45's. Both with the XPWR-131-120 power transformer.

victorm 10th September 2012 11:47 AM

Thanks Boywonder,
Can I ask you how hot your XPWR131 gets in the 300b TSE?
I can't remember the exact theory but recall vaguely that the same core will be closer to saturation at lower frequency (my 50Hz vs your 60 Hz - that is 20% difference!) - perhaps that is why I am getting this slight noise and heat? Thanks for your help.

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