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In Reply to: Can you identify this mystery transformer? posted by SuNormCo on December 2, 2006 at 15:25:44:
If you want the primary Z, it is fairly easy. Grab the plate lead and B+ lead and plug them into the 120V wall. Measure voltage on the 16R secondary. Divide wall voltage by secondary voltage, square the result and multiply by 16 to get the primary Z seen with a 16R load hung on the secondary.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
Thank you for suggesting a measurement method. I'd like to do what you suggest, but am not sure how the output leads are configured, that is, which lead is the common, which is 8 ohms, 16 ohms, etc. My reply to Paul Joppa provides more details on this part of the problem.
I love a good mystery. I have spent many hours figuring out what use various unmarked transformers were intended for.Those thin primary wires don't look like they have the insulation properties required for the 1KV or so you would have in a 211 SE amp.
Can you tell us where they came from?I once bought 3 large unused transformers on ebay that the seller indicated were unmarked and that he knew nothing of electronics. When I opened the box, the mystery lasted but a few moments. There was a small tag on each that said GTA***. The *** was the model number (I can't recall it at the moment) of the Golden Tube Audio SE amp that used 3 5881s in parallel. The same seller had sold one earlier. The guy that bought tried to buy one of mine, I tried to buy his....we never worked it out. I contacted the seller in the hopes he had other stuff from GTA, but he couldn't even remember where he got them from.
You make a very interesting point about the primary wires. They really do look too delicate to handle 1 Kv or so. The unfortunate reality is that the original purchaser is dead. So I rather doubt that I will ever learn the true provenance of these very substantial pieces of iron.
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