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Old 29th May 2014, 7:45 pm   #1
SurreyNick
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Default Checking midget output transformer

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
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Old 29th May 2014, 8:11 pm   #2
Station X
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Default 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.
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Old 29th May 2014, 8:19 pm   #3
SurreyNick
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Default Re: Checking midget output transformer

OK Graham, thanks, I think I know how to do that.
Regards
Nick
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Old 30th May 2014, 12:07 am   #4
Herald1360
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Default Re: Checking midget output transformer

Quote:
Originally Posted by SurreyNick View Post
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
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Old 30th May 2014, 12:14 am   #5
SurreyNick
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Default Re: Checking midget output transformer

Thanks Chris, it does help
Regards
Nick
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