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23.246.78.54
i tried looking at eia numbers and also some old posts not sure if its a fisher,arco or harmon, size is huge as compared to the arco 330 and weighs about 10 lbs
strangely the impedance measures 48 ohms between 1 and 2 and same for 2 to 3 and 1 and 3 the total is 92 ohms ,unless my meter is not showing me 4800 ohms
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That's a Fisher part number. About 1958 if their part numbers ran in sequence, which they appear to do. Does not match the Sams parts list for 50A, 80AZ, 100, 125 or 200. But there were various versions, may be a later replacement for one of those.
There are jillions of transformers out there and you can't go by looks. So, without any kind of specs printed on the unit you will be shooting in the dark without taking some measurements. Potted transformers also look pretty much the same so not even different manufacturers have distinguishing designs on potted transformers except UTC and a maybe a few others. If you only paid a couple of bucks for it, you can always use it for a door stop. cheers, Dak
Impedance, or, DC Resistance ?????What is the DCR from 4-5, 5-6 and, 4-6 ??
You can apply small AC voltages with a variac and get some idea of the turns ratio.
Maybe its a plate transformer !!
Jeff Medwin
Edits: 06/01/15
ooops its dc resistance
4-5 is 1.9ohms 5-6 is 1.9 ohms 4-6 is 2.9 ohms
i brought this in a garage sale , what looked like a monoblock amp the power transformer is also huge (not potted) it had two caps that fit in tube sockets 1 amprex tube relay ,2 6sn7gtb and a quad of tube sockets with no tubes the 4 and 6 were connected to some speaker outputs and the 1 and 3to the tubes and 2 seemed like a center tap
on one of the old aa threads someone said they had a 900:1 turns ratio
i will try some ac and get a new mm this weekend, i was hoping it was an arco as i am hunting for a 350 or 330
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