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AudioRoundTable.com: Thermionic Emissions => One output transformer hotter than the other

Home » Audio » Thermionic Emissions » One output transformer hotter than the other
so then... [message #9174 is a reply to message #9171 ] Tue, 30 August 2005 04:30 Go to previous messageGo to next message
Thrint  is currently offline Thrint
Messages: 43
Registered: May 2009
Baron
It has what looks like the same current flowing through it, it does not sound radically different from its cooler twin, and it is next to a heat source....

A short in it would effect only the sound, andwould actually make it run cooler. i is the same, but the r is now smaller. Power transformers are another story.
cheers,
Douglas

Re: One output transformer hotter than the other [message #9178 is a reply to message #9162 ] Sun, 04 September 2005 22:03 Go to previous messageGo to next message
hurdy_gurdyman  is currently offline hurdy_gurdyman
Messages: 414
Registered: May 2009
Illuminati (1st Degree)
I've decided to temporarily retire the old Scott until I can figure out what's going on. The right channel gets downrigh hot, the left only warm, but everything measures the same on both sides. Wierd. Also, the left side is a bit "duller" sounding than the right. I've dug out my old Fisher 500C receiver and am using just the amp/preamp section (see posts above.) The Fisher actually sounds somewhat nicer on my old EV LS-8 open baffles. Highs are smoother (softer?) and bass a bit fuller (a good thing with open baffles.) It sure looks ugly, though. Oh well, I guess it's hard to have it all.

Dave

Figured it out! [message #9186 is a reply to message #9162 ] Tue, 06 September 2005 14:24 Go to previous messageGo to next message
hurdy_gurdyman  is currently offline hurdy_gurdyman
Messages: 414
Registered: May 2009
Illuminati (1st Degree)
I got the old Scott fixed. Turns out that a 68 ohm resistor in the negative feedback circuit was open. Everything sounds great now.

Dave

Well, almost [message #9187 is a reply to message #9186 ] Tue, 06 September 2005 17:39 Go to previous message
hurdy_gurdyman  is currently offline hurdy_gurdyman
Messages: 414
Registered: May 2009
Illuminati (1st Degree)
After several hours of running, the sound is still excellent, but that right tranny still gets way hotter than the left, uncomfortably hot. Maybe it's normal and I'm to much of a worry wort. While I was working on it earlier, I checked carefully the resistance of the right channel tranny vs the left one. They are identical, so no short. Wasn't able to find any more bad resistors. I put my hand on it for about 15 seconds then had to pull off as it was starting to hurt. I can leave my hand on the left on as long as I like.

Does this sound like normal extra heating from the rectifier?

Dave

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