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tube power transformer B+ amperage

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Posted on May 13, 2016 at 17:07:08
tubeflash
Audiophile

Posts: 223
Joined: December 22, 2001
 I have a power transformer with an unknown B+ amperage rating.can an approximation be derived from knowing the voltage (425-0-425 vac)
and the resistance of the windings (55 ohms and 54 ohms)from
center tap to each B+ tap . any help would be appreciated.

 

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RE: tube power transformer B+ amperage, posted on May 13, 2016 at 18:46:26
hennfarm
Audiophile

Posts: 535
Location: Oregon
Joined: October 8, 2008
 How much does the transformer weigh? Do you know what it was pulled from? My guess is 150ma. JH

 

RE: tube power transformer B+ amperage, posted on May 14, 2016 at 12:01:13
BofService
Audiophile

Posts: 741
Location: Atlanta
Joined: February 28, 2003
 The Hammond 279X is speced at 850v, resistance end to end is 95 ohms. The transformer is rated for 173ma.

 

RE: tube power transformer B+ amperage, posted on June 24, 2016 at 12:40:04
pmaneri@samsontech.com
Manufacturer

Posts: 152
Location: Long Island,NY
Joined: May 22, 2015
 Tubeflash - I have often wondered about this too. So, I discussed with Edcor transformers and they said, you have to load down the secondary until the voltage drops by 10%. The current being drawn at that time should be the rated current. - Pete

 

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