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 Post subject: Magnavox Amplifier 1920's
PostPosted: Feb Mon 12, 2018 3:40 am 
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Location: Plymouth, MI
I can seem to find out much about this amp. Does anyone have any information on it and possibly a schematic? As always, all help is greatly appreciated.



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Magnavox Amp-e.jpg
Magnavox Amp-e.jpg [ 230.78 KiB | Viewed 499 times ]

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Dan

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Mon 12, 2018 4:34 am 
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Looks like a Magnavox AT-3. Google that model and you should find out a lot more about it.

GL,

Terry
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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Mon 12, 2018 4:39 am 
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Hello atwaterkent,
what great amp


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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Mon 12, 2018 4:47 am 
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Thanks Radiorich.

I believe it is an AT-3 model C. Thanks Terry!

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Tue 13, 2018 9:47 pm 
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There's an AC3 too ...


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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 14, 2018 12:02 am 
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Why the two key slots on each tube socket?

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 14, 2018 12:37 am 
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So that VT-2 (205D) tubes could be used in the amplifier if desired.

Norman

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"No home is complete without music" - Capehart Sound Amplifying and Distributing Systems


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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 12:56 am 
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Still haven't found a schematic or information on the AC3C I've acquired. I know the filament voltage is 6V but I don't know what the B voltage is. Doe anyone know anything about the amp?

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Last edited by atwaterkent1 on Feb Wed 21, 2018 2:25 am, edited 1 time in total.

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 1:50 am 
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Location: Chapel Hill, NC, USA
Recommended B+ voltage is 67, Dan, but it will also work with either 45 or 90.

-- Grant


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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 2:24 am 
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Thanks Grant. Do you have one? How did you know?

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 2:40 am 
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One more question please, what are the "field" connections for?

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Dan

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 3:53 am 
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The Magnavox Telemegaphone speakers including the R2 and R3 had field coils rather than permanent magnets. The speakers field coil would hook up to the "field" posts on the amplifier.

Norman

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 3:56 am 
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Thanks Norman for helping me with my ongoing education here at the Forum!

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Dan

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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Wed 21, 2018 11:25 am 
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atwaterkent1 wrote:
Thanks Grant. Do you have one? How did you know?


I don't have one at the moment, Dan, but I have had several AC-3's (and AC-2's) in the past. They're great early amplifiers. Beautifully made, too.

-- Grant


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 Post subject: Re: Magnavox Amplifier 1920's
PostPosted: Feb Thu 22, 2018 3:09 am 
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I agree Grant, it looks so much better than the typical 20's amp. Finally had time to go through the amp and it all looked great, so time to try it out. Wired it up to my Radiola III and it worked great, all three stages. One of my better acquisitions.

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Radiola 3 & A3C3.jpg
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