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Industrial (step-down) control transformers used in reverse?
Industrial (step-down) control transformers used in reverse?
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Old 17th June 2019, 10:44 PM   #11
john20851 is offline john20851  United Kingdom
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Join Date: Aug 2017
Location: lincoln
A beautiful looking amp, but do you have problems with the tubes heating the capacitors? Just curious, as I had some fail under similar circumstances.
regards john
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Old 18th June 2019, 12:25 AM   #12
Tubelab_com is offline Tubelab_com  United States
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Join Date: Jul 2005
Location: West Virginia panhandle
A beautiful looking amp,
You didn't look too closely. The top plate was once a road sign that was deposited in my backyard during a hurricane. The wood is scrap pine and it's held together with sheetrock screws. There isn't a straight corner in either box, and theyr'e all butt joints. Ten years of weekly wood shop classes at a local night school have occurred since I built that amp, and I do a bit better now.

but do you have problems with the tubes heating the capacitors?
The driver board is the very first prototype of one of my original TSE amps. It's running 45's which only dissipate about 10 watts each. There are three 5AR4's in the power supply which do put out some heat, and the row of caps next to them get rather warm but not too hot to touch. The 211's or 845's dissipate 100 to over 150 watts each.....that, and all the other losses turned out to be the problem.

I built this amp in 2004. At that time my lab, listening room, and workshop was all confined to a 10 X 10 foot room with poor airflow and I lived in south Florida. That amp pumped 500+ watts of heat into the room which was sufficient to raise the temperature to unbearable in about an hour. For this reason the amp saw very little use.

When my 41 year career at Motorola ended, I packed up everything and moved 1200 miles north. Two winters ago I dug the amp out of it's box and plugged it in, at which point a fireworks display erupted inside one of the 5AR4's and the fuse blew.....I still have not investigated, but maybe one of those caps next to the 5AR4's did die.

I have waffled between fixing it, and completely rebuilding it......so nothing at all has happened. There is EXPOSED plate voltage on the top of the amp and power supply, and I get surprise visits by young grandkids now, so that death box remains safely up on the shelf far from a power outlet for now.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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