DIY Audio Projects Forum
http://diyaudioprojects.com/Forum/

Power transformer ?
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=111
Page 1 of 2

Author:  Endspec [ 12 Aug 2008, 22:03 ]
Post subject:  Power transformer ?

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

Author:  billp [ 12 Aug 2008, 23:21 ]
Post subject:  Re: Power transformer ?

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.

Author:  Gio [ 12 Aug 2008, 23:53 ]
Post subject:  Re: Power transformer ?

Yes, a picture would be handy. Break out the multimeter and see if 3, 4 and 5 are connected.

Cheers

Author:  Endspec [ 13 Aug 2008, 00:06 ]
Post subject:  Re: Power transformer ?

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.

Author:  bsgd [ 13 Aug 2008, 06:31 ]
Post subject:  Re: Power transformer ?

Looks like a great tranny for a small amp or a preamp!

Author:  Gio [ 13 Aug 2008, 12:56 ]
Post subject:  Re: Power transformer ?

Yeah, that should be suitable for a number of projects. Nice find.

Author:  Endspec [ 13 Aug 2008, 22:31 ]
Post subject:  Re: Power transformer ?

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

Author:  bsgd [ 13 Aug 2008, 23:05 ]
Post subject:  Re: Power transformer ?

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.

Author:  billp [ 16 Aug 2008, 10:51 ]
Post subject:  Re: Power transformer ?

Yes, the second one has high voltage, but you can use a high R choke to bring it down.

Author:  alexg [ 04 Sep 2008, 21:27 ]
Post subject:  Re: Power transformer ?

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!

Page 1 of 2 All times are UTC - 6 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/