1939 Zenith Radio Burro Betsy - diyAudio
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Old 5th November 2013, 06:45 PM   #1
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Default 1939 Zenith Radio Burro Betsy

A non-audiophile friend of mine requested I convert his non-functioning 1939 Zenith radio into a working stereo that he and his kids could use with their iPhones and iPods in their 1920's home. His criteria was that I keep the project as low cost as possible (read no restoration parts), while still coming up with some decent sound. I gutted the tube amplifier/tuner parts and replaced them with a 15 watt per channel TPA3122d2 Class D amplifier. This amp can run successfully off a safe, 12 volts. The TPA3122 is also a good match sonically to the Wild Burro drivers. The original baffle board was removed and a new one constructed from Birch ply. Two Betsy drivers were installed on the new baffle board. This thing rocks! As anyone knows, two Betsy's can go quite loud with 15 watts.

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Old 5th November 2013, 09:24 PM   #2
sreten is online now sreten  United Kingdom
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Hi,

An inductor (possibly with a parallel resistor) on the bottom unit might
be useful to make it richer and reduce vertical comb filtering effects.

We are talking cheap tweaking and voicing here, not rocket science.

Very nice cabinet though. I wonder if the central sections were
intended to have any acoustical purpose, I suspect perhaps.

Presumably its mono.

rgds, sreten.
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Last edited by sreten; 5th November 2013 at 09:27 PM.
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Old 6th November 2013, 11:32 AM   #3
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In 1939 it was mono of course. Now it's stereo.


Quote:
Originally Posted by sreten View Post
Hi,

An inductor (possibly with a parallel resistor) on the bottom unit might
be useful to make it richer and reduce vertical comb filtering effects.

We are talking cheap tweaking and voicing here, not rocket science.

Very nice cabinet though. I wonder if the central sections were
intended to have any acoustical purpose, I suspect perhaps.

Presumably its mono.

rgds, sreten.
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Old 6th November 2013, 01:07 PM   #4
ejfud is offline ejfud  United States
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Pretty cool. Nice work.
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Old 7th November 2013, 06:53 PM   #5
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Neat!
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Old 7th November 2013, 08:43 PM   #6
sreten is online now sreten  United Kingdom
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Quote:
Originally Posted by cervelorider View Post
In 1939 it was mono of course. Now it's stereo.
Hi,

You have wired the drivers vertically in stereo ?
Not the best plan IMO, but it will work in a fashion.

rgds, sreten.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 11th November 2013, 06:51 PM   #7
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What's the best plan Sreten? I'm open to suggestions for the next one.



Quote:
Originally Posted by sreten View Post
Hi,

You have wired the drivers vertically in stereo ?
Not the best plan IMO, but it will work in a fashion.

rgds, sreten.
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