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Old 28th February 2011, 10:06 AM   #1
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Default 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?
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Old 4th March 2011, 08:52 AM   #2
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Old 4th March 2011, 12:42 PM   #3
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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
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Old 7th March 2011, 06:58 PM   #4
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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
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Old 9th March 2011, 01:49 AM   #5
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What voltages are they?
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Old 9th March 2011, 11:49 AM   #6
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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
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Old 9th March 2011, 03:21 PM   #7
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Quote:
Originally Posted by nic6paul View Post
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.
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Old 9th March 2011, 05:37 PM   #8
pjanda1 is offline pjanda1  United States
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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
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Old 9th March 2011, 11:46 PM   #9
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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.
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Old 10th March 2011, 12:36 AM   #10
pjanda1 is offline pjanda1  United States
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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
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