Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => AmpTools/Tech Tips => Topic started by: rafe on September 08, 2022, 04:58:44 pm
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This is a hefty transformer with a 2 prong plug on one side and a two prong outlet on the top. It has an 8 position switch on top 45 v to 150 v It has a voltmeter built into the front 0-150 v 10 v increments with the 120 being red. What is its purpose? Isolation Transformer??? Quasi variac ??
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Pictures, model number?
Sounds like a bench transformer with switched secondary outputs. Use your ohmmeter to see if the output is isolated from input.
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I forgot to write down the model # and I'm unable to go back out to the shop because of rain .....lot's of rain inundated with rain ....Too much rain :BangHead: , I'll post them tomorrow hopefully with a photo ,,,,and I'll check continuity
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I checked e-bay same model same one what is it for????SUPER RARE VINTAGE STANCOR A. C. VOLTS 0-150 METER STANCOR TRANSFORMER PV 6441 | eBay (https://www.ebay.com/itm/134214177897?chn=ps&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=134214177897&targetid=4581183927179149&device=c&mktype=&googleloc=&poi=&campaignid=418233787&mkgroupid=1241348861725295&rlsatarget=pla-4581183927179149&abcId=9300542&merchantid=51291&msclkid=1e626edac29c1a16a3150dc054fe272a)
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I highlighted your transformer in the attached pdf...
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It's on the "Isolation Power" page, so my guess is that it could be used with a 117v source as an isolation trans. ? The output recepticle being permanently connected to the 115 v tap has me questioning that ?? if there is no continuity when off on all settings it should be alright as an I. T. ?
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It's an autotransformer so there will not be any isolation. Read the description just above section B.
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Thanks I had read that , it really did not give me much to go on to be honest. It looks great though I picked it and several VTVM's a signal generator, resistors and 1% resistors at the flea market at a low price. I do appreciate your help on this . I'll keep it around in case they cut back our voltage I'd be lost without a tube amp :icon_biggrin:
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It's 6 pounds. As an isolation transformer that's about 40VA at most; but this is 150vA. So it is, as said, an auto-transformer, no isolation.
15V steps are remarkably huge.
65V and 145V inputs are pretty silly. If that 145V was coming out of your walls, 115V incandescent lamps would be BRIGHT and last about 2 days. OTOH, 65V won't toast bread or light an incandescent brighter than a birthday candle.
It is really hard to see what market Stancor had in mind.
If you reverse the genders, it could turn modern 125V down to 70V, brown sound.
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If you reverse the genders
maybe "stepped" electric fencing, 65vac on the perimeter, 145 for inside ring :laugh: