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 Post subject: Mystery make of 1930's amplifier, Acratone, Lafayette, Oper?
PostPosted: Apr Thu 11, 2019 5:42 am 
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Joined: Apr Sat 04, 2015 6:15 am
Posts: 1160
Location: Dos Rios, CA.
I know I've seen these knobs before somewhere?!?
Trying to figure out what this mystery amp is before I receive it, seller claims it may be an Operadio?...
Looks like it's been messed with some recently...I think it looks like an old Executone, Lafayette, Acratone...
but can't find it in my old Operadio and assorted '30's radio catalogs anywhere, Tim Tress might know it on sight... :!:
Here's some photos...
-Kent


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operadio knobs.jpg
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s-l1600-5.jpg
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s-l1600.jpg
s-l1600.jpg [ 71.9 KiB | Viewed 526 times ]
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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Thu 11, 2019 2:44 pm 
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Location: South Jersey East of Philly
My 1940's Epiphone guitar amp has these knobs..and it's all original.


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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Fri 12, 2019 1:20 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beaver Falls, PA. USA
Sorry, but I have never seen that one before! Do you have a picture of the bottom of the chassis? Any idea of the tube lineup? If you're really lucky, the schematic might be on the inside of the bottom plate, if it has one.

You might try looking through the Webster schematics; it looks like something that they would make. It's not a theatre, organ, or jukebox amp.

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Tim KA3JRT


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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Fri 12, 2019 1:40 am 
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Joined: Apr Sat 04, 2015 6:15 am
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Location: Dos Rios, CA.
Thanks Tim and Tbrdkid for your replies, I'll look online for photos of early Epiphone amps...
I'll check into Webster, Tim, that's Webster Chicago I assume, not Webster Electric of Racine?

I can't be 100% sure until I receive it, but I believe the socket closest to the pwr transformer has markings on it for 5V4
in one of the other photos I didn't post. Otherwise have no idea of tube line up, other than the driver tube has been substituted probably
with a socket for 6SN7 or similar as may be an older type tube.


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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Fri 12, 2019 8:49 pm 
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Location: Beaver Falls, PA. USA
It could be a 6N7; that was a common driver tube back then. The preamp tubes are likely to be 6F5s or 6J7s; a quick check of the socket wiring will be a clue.

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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Sat 13, 2019 4:08 pm 
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Yes, a 6N7 is what I'm thinking went there originally, thanks for re-affirming.

Tbrdkid- I've been finding more "original" Epiphone Electar Zephyr amps since you sent the photos of yours, (thanks again!)
and it does indeed look like, in comparison to other "original" amps, that those are original knobs.
In fact the companion Lap Steel guitar that sold with the amp in the early 1940's, has ivory knobs of exact same style as the brown ones used on the amplifier.

I'm curious what the original tube line up is on your Electar Zephyr amp, I see a 5Z3 and a 75...not sure of preamp tubes (under shields)
and what I assume are 2 large 6L6G's or 42's in P/P?


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 Post subject: Re: Mystery make of 1930's amplifier, Acratone, Lafayette, O
PostPosted: Apr Tue 23, 2019 2:36 am 
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Location: Dos Rios, CA.
Well, finally received the "mystery" amp this afternoon.
Has two chokes underneath, one is marked Thordarson and the other is numbered, but don't know the make yet.
A -3830 Stancor "universal" output transformer, according to my '56 Stancor catalog good for 18.5 watts with 6L6.
Tube line-up according to what's printed on the sockets:
(2) 6J7
(1) 6N7
(2) 6L6
(1) 5V4

Some one's been in here before somewhat recently as all the paper caps have been replaced with Nichicon orange/red drops, although the electrolytics
and paper BOX! caps look untouched...Does anyone know how to date the Nichicon numbers?
Obviously I'll have to replace the electrolytics before even variac time...
Strange AC like speaker jacks with holes in them...hmmm


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Operadio mystery amp 4 22 19 1.JPG
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Operadio mystery amp 4 22 19 2.JPG
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Operadio mystery amp 4 22 19 7.JPG
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Operadio mystery amp 4 22 19 9.JPG
Operadio mystery amp 4 22 19 9.JPG [ 158 KiB | Viewed 247 times ]
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