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Old 8th October 2010, 05:03 PM   #1
Pyre is offline Pyre  Canada
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Default Help Identifying Old Westinghouse Tube Amp?

Got this yesterday with a bunch of Hammond transformers.

It appears to be out of a Westinghouse Super Heterodyne model 101 receiver of some sort but I can not find any information online about it. What I was looking for is a schematic or transformer specs. I was hoping to get enough parts out of it to make a 45pp mono amp. It has no driver tubes just two 45's and one 80 rectifier.

It appears the chassis was set up differently at one time and then factory converted to have the tubes horizontal instead of vertical. The sockets are still on the bottom just not drilled out. The badge is installed over one of the holes labeled UX245. Seems odd as the tubes are shorter then the tallest transformer.

It sure looks like an old RCA amp I have seen before but can not remember where or what model.

Any information would be appreciated.

Shane

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Old 8th October 2010, 08:29 PM   #2
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Modified for vertical mounting in a narrow cabinet. See link below:

http://www.nostalgiaair.org/PagesByM...8/M0030088.pdf
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Old 8th October 2010, 08:34 PM   #3
Pyre is offline Pyre  Canada
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Quote:
Originally Posted by Tom Bavis View Post
Modified for vertical mounting in a narrow cabinet. See link below:

http://www.nostalgiaair.org/PagesByM...8/M0030088.pdf
Thank you so much Sir. that is exactly what I was looking for.

Shane
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Old 8th October 2010, 10:02 PM   #4
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This is the type of cabinet it was usually installed in (the front is shown here). There were several variants of this old radio, and they all usually consisted of a combined power supply/AF amp on the bottom, an RF chassis mounted above that, and an upward-firing speaker installed on top. The P-P 45's were usually mounted on a wooden shelf screwed to the inside of the cabinet.

One additional note: please be aware that this chassis used the speaker field coil as a power supply choke!
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Old 8th October 2010, 10:45 PM   #5
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Quote:
Originally Posted by Mr. Zenith View Post
This is the type of cabinet it was usually installed in (the front is shown here). There were several variants of this old radio, and they all usually consisted of a combined power supply/AF amp on the bottom, an RF chassis mounted above that, and an upward-firing speaker installed on top. The P-P 45's were usually mounted on a wooden shelf screwed to the inside of the cabinet.

One additional note: please be aware that this chassis used the speaker field coil as a power supply choke!
Very interesting, I saw that on the schematic and thought it odd and quite creative.

I can sort of make it out on the schematic but just wanted to double check, is the speaker impedance 10R, is that not quite low for a field coil? I thought they were all 500R+

I was planning on using the parts to build a really vintage looking electric cello amplifier.
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Old 8th October 2010, 10:58 PM   #6
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The 10 Ohms is actually the voice coil measurement. The field coil is shown a bit left of that; it's actually a 40H choke, with a DC resistance of something like 1330 Ohms.
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Old 8th October 2010, 11:06 PM   #7
Pyre is offline Pyre  Canada
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Quote:
Originally Posted by Mr. Zenith View Post
The 10 Ohms is actually the voice coil measurement. The field coil is shown a bit left of that; it's actually a 40H choke, with a DC resistance of something like 1330 Ohms.
Thanks, any idea what I can use for a speaker or will I have to find another fieldcoil. I passed on the chance to buy some 1500R impedance drivers a while back and now I am kinda mad that I did not. Really I only need something that will cover a frequency range of 60Hz to 1000Hz.
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Old 8th October 2010, 11:50 PM   #8
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Pyre,

Using the field coil as the 2nd inductor in a CLCLC filter was standard practice.

You don't need a field coil driver. Insert a series combination of inductance and resistance equal to that of the field coil.

The 10 Ω voice coil is problematic. Try an 8 Ω driver and see what happens.
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Old 4th March 2014, 04:31 AM   #9
Brock is offline Brock  Canada
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Default Westinghouse Receiver #101 circa 1930

I found a Westinghouse super heterodyne reciever #101 when cleaning my father's attic. I don't know if it works or not. If anyone would like it for parts, it is in Vancouver BC. Free for the taking.
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