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Very Warm Transformer (Read 160 times)
BobOH1
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Very Warm Transformer
07/23/20 at 01:21:08
 
After playing my Rachael amp for a half hour, the transformer becomes very warm and only gets hotter as time goes on. Not enough to burn your hand but much warmer then any other transformer I have felt before. Is this normal? If the volume is turned up does the transformer become hotter as more current goes through the amp? Thanks.
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Archie
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Re: Very Warm Transformer
Reply #1 - 07/23/20 at 01:24:55
 
Can you keep your hand on the transformer?  If so, I doubt it's too hot.  My ZMA output transformers get hot but never more than allowing me to keep my hand on them for a few seconds.  The spec temperature is much higher than this.

I don't think playing music raises the temperature much over just idle.
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Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
ZLC
Homemade Big Betsy Speakers
Silver Cabling
DIY Isolation platforms under amps & TT.
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BobOH1
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Re: Very Warm Transformer
Reply #2 - 07/23/20 at 01:28:50
 
I can place my hand on it and hold it for 15 seconds when it starts to get a bit uncomfortable so maybe just normal operation for these then.
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Archie
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Posts: 1975
Re: Very Warm Transformer
Reply #3 - 07/23/20 at 15:55:00
 
I think around 120 F is where it gets too hot to touch so if that's the max you get I'd guess you're fine.

My transformers run cooler since I started using a ZLC.
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Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
ZLC
Homemade Big Betsy Speakers
Silver Cabling
DIY Isolation platforms under amps & TT.
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Steve Deckert
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If the 1st watt
sucks why continue?

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Re: Very Warm Transformer
Reply #4 - 07/23/20 at 16:47:49
 
The SE34I.5 draws around 90 milliamps no matter what the volume setting.  The transformer is rated at 170 milliamps at 170 degrees.  So current is not actually a factor in the transformers temperature, it is more infrared heat from the rectifier tube washing the transformer that heats it up.  

If you can hold you hand on it for 10 seconds, that is about 110 degrees.  130 degrees is normal, so you are well within the safe zone.

Steve
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BobOH1
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Re: Very Warm Transformer
Reply #5 - 07/23/20 at 20:03:42
 
Thanks Steve for putting my mind at ease.
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