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 Post subject: Power transformer ?
PostPosted: 12 Aug 2008, 22:03 
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Joined: 06 Jun 2008, 14:03
Posts: 272
Location: Tulsa, Oklahoma
I have these two military power tranys and the read on the pins
1&2 = 120 volt input
3&4 380 volt 175 MA
4&5 340 Volt 200MA OV.
6,7&8 are 6.3 CT @5amp

Is it a useible power trany for a tube DIY project?
The reason I am asking is the different high voltage on the 3,4&5 taps


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 Post subject: Re: Power transformer ?
PostPosted: 12 Aug 2008, 23:21 
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Joined: 31 Jul 2008, 23:21
Posts: 62
Yes, they would be very suitable. Depending on which tubes you use, some may consider the voltage to be too low! Use a choke or resistors to get the desired B+. Too much voltage in a power supply is never a problem, but too little is.

Show us a picture. I am guessing 4 is a center tap.


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 Post subject: Re: Power transformer ?
PostPosted: 12 Aug 2008, 23:53 
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Joined: 28 May 2008, 21:53
Posts: 4561
Location: Winnipeg, CANADA
Yes, a picture would be handy. Break out the multimeter and see if 3, 4 and 5 are connected.

Cheers

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 Post subject: Re: Power transformer ?
PostPosted: 13 Aug 2008, 00:06 
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Joined: 06 Jun 2008, 14:03
Posts: 272
Location: Tulsa, Oklahoma
Yes #4 is a center tap and here are some pic's, sorry but there from my web cam as my good digi bit the dust.


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 Post subject: Re: Power transformer ?
PostPosted: 13 Aug 2008, 06:31 
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Joined: 04 Jun 2008, 22:27
Posts: 146
Location: Brazil
Looks like a great tranny for a small amp or a preamp!

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 Post subject: Re: Power transformer ?
PostPosted: 13 Aug 2008, 12:56 
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Location: Winnipeg, CANADA
Yeah, that should be suitable for a number of projects. Nice find.

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 Post subject: Re: Power transformer ?
PostPosted: 13 Aug 2008, 22:31 
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Joined: 06 Jun 2008, 14:03
Posts: 272
Location: Tulsa, Oklahoma
I also have one more out of a small tester from the navy
primary 120-170 volt
sec 1 580ct 28MA DC WV 410
sec 2 6.3V 2.3 amps WV 410
sec 3 8.3 V .625 MA. DC WV 16
By Stanley Transformer Co.

It is not metel cased though, looks like it is dipped in a ressin of sorts


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 Post subject: Re: Power transformer ?
PostPosted: 13 Aug 2008, 23:05 
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Joined: 04 Jun 2008, 22:27
Posts: 146
Location: Brazil
Endspec wrote:
I also have one more out of a small tester from the navy
primary 120-170 volt
sec 1 580ct 28MA DC WV 410
sec 2 6.3V 2.3 amps WV 410
sec 3 8.3 V .625 MA. DC WV 16
By Stanley Transformer Co.

It is not metel cased though, looks like it is dipped in a ressin of sorts



This one looks ok for a preamp, although you'll need to get that voltage down as 580 is way too much.

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 Post subject: Re: Power transformer ?
PostPosted: 16 Aug 2008, 10:51 
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Joined: 31 Jul 2008, 23:21
Posts: 62
Yes, the second one has high voltage, but you can use a high R choke to bring it down.


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 Post subject: Re: Power transformer ?
PostPosted: 04 Sep 2008, 21:27 
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Joined: 04 Jun 2008, 21:02
Posts: 85
Location: Philippines
Endspec wrote:
I have these two military power tranys and the read on the pins
1&2 = 120 volt input
3&4 380 volt 175 MA
4&5 340 Volt 200MA OV.
6,7&8 are 6.3 CT @5amp

Is it a useible power trany for a tube DIY project?
The reason I am asking is the different high voltage on the 3,4&5 taps


This will be great for an EL34 SE amp! or even an SE 2a3!


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