WTB - Tube power transformer

lazzer408 · 28th February 2011, 10:06 AM

While right in the middle of my 10w PP mono guitar amp project, my power transformer went. It was a chassis mount and the closest Hammond is a Classic 273DZ on 2.25x2.81" mounting holes.

At this point in time I'm willing to use anything that will get me 250-300vdc and a 6v heater just to get the amp running. I'm very limited on chassis room so one transformer is all I can fit. It has to power 2 6V6GTs and 4 12AX7s.

Anyone have something kicking around?

lazzer408 · 4th March 2011, 08:52 AM

Bump

jmillerdoc · 4th March 2011, 12:42 PM

I probably have a tranny that will give the voltages but I don't think its going to be a lay down chassis mount...I have several OS uprights that will probably work if you can fit them. Let me look, shoot me an email later today at millerjeff@ccmhonline.com.
Jeff

jmillerdoc · 7th March 2011, 06:58 PM

Looks like I don't have what you need....I have a couple more somewhere I can't seem to locate, if I can find them soon I will test the voltages and see but so far the few I have in the size range I imagine you need aren't the correct voltages.
Sorry,
Jeff

lazzer408 · 9th March 2011, 01:49 AM

What voltages are they?

nic6paul · 9th March 2011, 11:49 AM

I have a laydown transformer from a Magnavox AMP-185. 290-0-290, 2 - 6.3v @~2a and a 5v winding. If this interests you I can measure the mounting holes etc. The original amp was PP 6V6

lazzer408 · 9th March 2011, 03:21 PM

Quote:

Originally Posted by nic6paul

I have a laydown transformer from a Magnavox AMP-185. 290-0-290, 2 - 6.3v @~2a and a 5v winding. If this interests you I can measure the mounting holes etc. The original amp was PP 6V6

That could work. Would get me somewhere close to 300vdc. Measure away.

pjanda1 · 9th March 2011, 05:37 PM

I've got a 300-0-300 at 110ma, laydown with centers about 2 9/16" and 3 1/8". The whole thing is 4"x 3 3/8" x 3 1/2". Two 1.5A 6.3V windings and a 6.3V at .6A. Tons of primaries too, 100, 110, 120, 220, 240. From a Sony TC500A R2R. Others here have sold (and some still listed) for $40. I don't need that much.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers

nic6paul · 9th March 2011, 11:46 PM

Well I measured the bolts they are 3 11/16" x 3". The cut out for the transformer is 3 1/8" x 2 3/8". The transformer model is 300701-1 138008 when googling the model# it brings up a few threads that pertain the the Magnavox amp-185. Closer inspection shows that it only has one 6.3v secondary schematic shows two. I may have to wire this up this weekend and check everything out. It is missing one filament winding. It could be a variation of the transformer. The transformer weighs in at 6.1 pounds.

pjanda1 · 10th March 2011, 12:36 AM

FWIW, it isn't difficult to stand a transformer up. I've used AL angle, maybe .75-1" and cut out the area for the endbells with a file and hacksaw. Now that I've got a dremel, it would be easy! You might need longer screws, but you also might not. I think I might have a similarly modded unit kicking around, but at 360-0-360, it isn't what you are looking for.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers

28th February 2011, 10:06 AM	#1
lazzer408 diyAudio Member Join Date: Sep 2010 Location: Chicago	WTB - Tube power transformer While right in the middle of my 10w PP mono guitar amp project, my power transformer went. It was a chassis mount and the closest Hammond is a Classic 273DZ on 2.25x2.81" mounting holes. At this point in time I'm willing to use anything that will get me 250-300vdc and a 6v heater just to get the amp running. I'm very limited on chassis room so one transformer is all I can fit. It has to power 2 6V6GTs and 4 12AX7s. Anyone have something kicking around?

9th March 2011, 11:49 AM	#6
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	I have a laydown transformer from a Magnavox AMP-185. 290-0-290, 2 - 6.3v @~2a and a 5v winding. If this interests you I can measure the mounting holes etc. The original amp was PP 6V6 __________________ - Nic

9th March 2011, 11:46 PM	#9
nic6paul diyAudio Member Join Date: Jan 2007 Location: Minnesota	Well I measured the bolts they are 3 11/16" x 3". The cut out for the transformer is 3 1/8" x 2 3/8". The transformer model is 300701-1 138008 when googling the model# it brings up a few threads that pertain the the Magnavox amp-185. Closer inspection shows that it only has one 6.3v secondary schematic shows two. I may have to wire this up this weekend and check everything out. It is missing one filament winding. It could be a variation of the transformer. The transformer weighs in at 6.1 pounds. __________________ - Nic

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4th March 2011, 08:52 AM	#2
lazzer408 diyAudio Member Join Date: Sep 2010 Location: Chicago	Bump

4th March 2011, 12:42 PM	#3
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	I probably have a tranny that will give the voltages but I don't think its going to be a lay down chassis mount...I have several OS uprights that will probably work if you can fit them. Let me look, shoot me an email later today at millerjeff@ccmhonline.com. Jeff

7th March 2011, 06:58 PM	#4
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	Looks like I don't have what you need....I have a couple more somewhere I can't seem to locate, if I can find them soon I will test the voltages and see but so far the few I have in the size range I imagine you need aren't the correct voltages. Sorry, Jeff

9th March 2011, 01:49 AM	#5
lazzer408 diyAudio Member Join Date: Sep 2010 Location: Chicago	What voltages are they?

9th March 2011, 05:37 PM	#8
pjanda1 diyAudio Member Join Date: Jan 2005 Location: The Nebraska Panhandle	I've got a 300-0-300 at 110ma, laydown with centers about 2 9/16" and 3 1/8". The whole thing is 4"x 3 3/8" x 3 1/2". Two 1.5A 6.3V windings and a 6.3V at .6A. Tons of primaries too, 100, 110, 120, 220, 240. From a Sony TC500A R2R. Others here have sold (and some still listed) for $40. I don't need that much. Paul Wild Burro Audio Labs - DIY Full Range Speakers

10th March 2011, 12:36 AM	#10
pjanda1 diyAudio Member Join Date: Jan 2005 Location: The Nebraska Panhandle	FWIW, it isn't difficult to stand a transformer up. I've used AL angle, maybe .75-1" and cut out the area for the endbells with a file and hacksaw. Now that I've got a dremel, it would be easy! You might need longer screws, but you also might not. I think I might have a similarly modded unit kicking around, but at 360-0-360, it isn't what you are looking for. Paul Wild Burro Audio Labs - DIY Full Range Speakers

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