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Old 6th September 2012, 11:42 AM   #1
victorm is offline victorm  Australia
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Default 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,

Cheers,
-Victor
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Old 6th September 2012, 01:36 PM   #2
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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
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Old 7th September 2012, 12:18 AM   #3
victorm is offline victorm  Australia
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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 ?
Cheers,
-Victor
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Old 7th September 2012, 01:51 PM   #4
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This is where I bought mine from. It had to go through some diy modification though. Tubelab SE - alternate power transformer

Last edited by Evenharmonics; 7th September 2012 at 01:56 PM.
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Old 7th September 2012, 02:51 PM   #5
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Victor: FWIW I've built my TSE with the XPWR131-120 and I have no buzz issues......
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Old 9th September 2012, 06:12 AM   #6
victorm is offline victorm  Australia
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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.
Cheers,
-Victor
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Old 9th September 2012, 07:16 PM   #7
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Quote:
Originally Posted by victorm View Post
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.
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Old 10th September 2012, 10:47 AM   #8
victorm is offline victorm  Australia
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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.
Cheers,
-Victor
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