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-   -   Checking midget output transformer (https://www.vintage-radio.net/forum/showthread.php?t=106584)

SurreyNick 29th May 2014 7:45 pm

Checking midget output transformer
 
4 Attachment(s)
Hi
This is the midget output transformer from my battery operated receiver (HT 120v / LT 2v accumulator). The writing on the side reads:

PRI:
BLUE & RED
MAINS PEN
& BATT. TRIODE
BLUE & GREEN
BATT. PEN
MAX 30 M/A. D.C.

Being a novice, that's pretty-much double Dutch to me.

Is there a simple way to check it's working properly without reconnecting it to the receiver?

Thanks

Nick

Station X 29th May 2014 8:11 pm

Re: Checking midget output transformer
 
The best you'll be able to do is use a meter on ohms range to check the continuity of the windings. If they show open circuit, then the transformer is toast. If they show continuity, then the transformer is probably OK, but it may have short circuited turns.

SurreyNick 29th May 2014 8:19 pm

Re: Checking midget output transformer
 
OK Graham, thanks, I think I know how to do that.
Regards
Nick

Herald1360 30th May 2014 12:07 am

Re: Checking midget output transformer
 
Quote:

Originally Posted by SurreyNick (Post 684513)
Hi
This is the midget output transformer from my battery operated receiver (HT 120v / LT 2v accumulator). The writing on the side reads:

PRI:
BLUE & RED
MAINS PEN-------- Taps for typical mains powered radio output pentode for about 5K load
& BATT. TRIODE- Taps for typical battery radio output triode for about 5K load
BLUE & GREEN
BATT. PEN--------- Taps for typical battery radio output pentode for about 10K load
MAX 30 M/A. D.C.- Maximum continuous primary DC (anode current of O/P valve)

HTH

SurreyNick 30th May 2014 12:14 am

Re: Checking midget output transformer
 
Thanks Chris, it does help :)
Regards
Nick


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