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Heathkit GR64 shortwave radio
I am in need of the Stancor part number for the power transformer. It is printed on the the brown paper. I know the values (105, 12 VAC secondaries) but I just can't find a replacement. I inadvertently destroyed the number on my transformer.
thanks Phil |
#2
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Heath part no. 54-155.
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#3
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Bob,
The heath part number draws nothing on the web. The Stancor number (PA-###) is what I need. Much better chance of finding it that way. So, if you ever have the cover of the radio off I would appreciate you taking a look. Thanks Phil |
#4
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I don't have the radio. I do have the manual and that's where I got the number.
You could rather easily, I think, reverse engineer the unit and come up with a ball park specification for the transformer. Armed with the tube complement and a tube manual, you can estimate the current draw. Looking at the voltage ratings of the filter capacitors you can estimate the needed voltage. |
#5
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Let's start over
What I thought was the original transformer turns out not to be. The secondaries are listed on the schematic as 105 VAC and 12 VAC. The draw on the heater winding is 1 amp. Will get around to the 105 volt soon. C to C on the mounting holes are 2 13/16.
Thanks Phil |
Audiokarma |
#6
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Those ratings were very common; every transformer catalog had something close. Just find an old catalog from Stancor, Thordarson, Merit, etc. and you will find almost the exact part.
Finding the hardware would be a different story. Perhaps you should rewind the transformer; what's wrong with it? |
#7
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Quote:
Not all that common. Heath carried this idea from their early days of using war surplus parts and had their transformers wound accordingly. |
#8
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You can use a transformer with a 6.3V winding and either retrofit different tubes (I don't recall the setup) or add a little 6.3V transformer to raise the voltage. There are many ways to do the job.
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#9
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Quote:
Heath used 12 volt tubes so they could use their beloved 12A6, as an audio output. They used that tube for everything, even as a rectifier. |
#10
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For many units, you don't have to replace the tubes, just rewire the heaters. I am not familiar with yours so I can't advise, but you seem to know enough to figure that out.
Meanwhile, while working on my HP651A output amplifier, my Tektronix 453 died. So now I have a bench full of projects. |
Audiokarma |
#11
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Quote:
Always was curious why they used that type as an output, and not a 6V6 or some more common type for that, but I can't really complain that they did.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#12
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Quote:
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#13
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Maybe 25-30 years ago the original went "poof" so I replaced it by literally stuffing two separate transformers inside the cabinet.
I'm now going thru the radio and replacing all wiring, re-stuffing the caps, etc. and thought it would be a good time to go back to one transformer if possible. I found a small filament transformer at Radio Shack that I will mount under the chassis. Back to one transformer on top of the chassis gives it that uncluttered look. I appreciate all that have taken time to respond. And if you ever run across a replacement transformer, please let me know. Thanks Phil Last edited by reeferman; 09-03-2012 at 09:28 PM. |
#14
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The 211's were sold for less than $1.00 each. |
#15
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What are 211's BTW?
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
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