Hi, I got this on ebay:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=110052313957&rd=1&rd=1

and there are no identifying marks as to model number.
I has tubes numbered: 12SA7 12SK7 12SQ7 35Z5 50L6
Can anyone tell me the model number, or if the
circuit is "very" standard, what schematic I could
use to approximate this circuit's setup. Also if
these turntables run on 117VAC so that I could test the
motor with the full AC power..
Thanks

This octal tube line-up is a very standard AC/DC circuit, probably from the '50s. Many sets will have this line-up, but fewer with the record player.

:Hi, I got this on ebay:
:
:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=110052313957&rd=1&rd=1
:
:and there are no identifying marks as to model number.
:I has tubes numbered: 12SA7 12SK7 12SQ7 35Z5 50L6
:Can anyone tell me the model number, or if the
:circuit is "very" standard, what schematic I could
:use to approximate this circuit's setup. Also if
:these turntables run on 117VAC so that I could test the
:motor with the full AC power..
:Thanks

Thanks, actually that is a popular line up as you say. I did play with the unit, looks like a late 30's. I got the AM to work great, with little or no hum, all original parts. The motor works fine too, just had a bad SPST switch to turn it on. The cartridge may be bad (Astatic 612 M122), I get a noise from touching the solder contacts, but not from scratching the needle, so I guess its plugged into the chassis correctly.
Before I first posted, I managed to find an Emerson Radio which most closely resembles it by looks, the FJ412

http://radioatticarchives.com/images/e/Emerson_FJ412_Bardos.jpg

But that's not listed on this site in resources. I can probably easily find a similar tube lineup schematic though.

The knobs are exactly alike, fit on grooved posts and have a crossbar to fit the slit on the end of the shaft. Is there a name for this know style? Thanks.

Actually, I finally did find the FJ412 on this site and the schematic shows it has a phonograph as well, so that solves most of it. Thanks again

Frank,
How did you cross the phono cartridge p/n to the Astatic number? I'm trying to find the p/n for what I think is an Astatic cartridge on an RCA (1945 era) radio/phono, but w/no success.

marv

:Thanks, actually that is a popular line up as you say. I did play with the unit, looks like a late 30's. I got the AM to work great, with little or no hum, all original parts. The motor works fine too, just had a bad SPST switch to turn it on. The cartridge may be bad (Astatic 612 M122), I get a noise from touching the solder contacts, but not from scratching the needle, so I guess its plugged into the chassis correctly.
:Before I first posted, I managed to find an Emerson Radio which most closely resembles it by looks, the FJ412
:
:http://radioatticarchives.com/images/e/Emerson_FJ412_Bardos.jpg
:
:But that's not listed on this site in resources. I can probably easily find a similar tube lineup schematic though.
:
:The knobs are exactly alike, fit on grooved posts and have a crossbar to fit the slit on the end of the shaft. Is there a name for this know style? Thanks.
:
:

I'm having trouble with exactly the same thing.
Not sure if the cartridge is good. The needle looks ok but does not tighten into the cartridge with the set screws. The wiring seems ok, but I get no "amp" sound when tapping on it, just a bit of soft static when actually touching the connecting wires.
On the cartridge it says "The Astatic Corp, Conneaut, Ohio" licensed under Brush Development patents, with a series of numbers, and patented in Canada 1931.
There are two numbers stamped in red over this:
612
M22

I've been trying the past few hours and have not been able to locate any such numbers on any site, antique radio and others. It's 78 RPM only, and the unit is from around 1942. It does say "crystal pickup" on the scehmatic.
Any help appreciated.

Frank,
Thanks, mine had no ID whatsoever. All I have is an RCA p/n from the parts list, but that doesn't show up on any sites either. My symptoms were same as yours, although I misinterpreted them as a working cartridge, and purchased a needle from West-Tech. The results were again, same as yours. With nothing to lose, I've opened the cartridge, removed/cleaned the inside of lots of goo and fractured quartz. Found an online post from a guy who replaced the guts of an old crystal cartridge with a piezo element from a newer cartridge he had salvaged, so it looked original, but with new stuff inside. Think I'll try that too as soon as I find a cheap ceramic part. I've been led to believe that the ceramic parts are nearly eqivalent to the old crystal parts as for output level.

marv

:I'm having trouble with exactly the same thing.
:Not sure if the cartridge is good. The needle looks ok but does not tighten into the cartridge with the set screws. The wiring seems ok, but I get no "amp" sound when tapping on it, just a bit of soft static when actually touching the connecting wires.
:On the cartridge it says "The Astatic Corp, Conneaut, Ohio" licensed under Brush Development patents, with a series of numbers, and patented in Canada 1931.
:There are two numbers stamped in red over this:
:612
:M22
:
:I've been trying the past few hours and have not been able to locate any such numbers on any site, antique radio and others. It's 78 RPM only, and the unit is from around 1942. It does say "crystal pickup" on the scehmatic.
:Any help appreciated.
:

Well, post back if you find a solution, or can suggest a new cartridge unit that should definitely work as a substitute. I don't know whether or not in those days there were a lot of electrical differences in the cartridges

Frank,
I tracked down an Astatic p/n M22 at West Tech Services http://www.west-techservices.com. They have several old pix of Astatic catalog pages, and also rebuild old cartridges for a price. Give it a look. Also checked http://jukemania.com for a cross, but no luck. Your M22 states 2.9V output, far more than modern magnetic and most ceramics, but thats the problem replacing the old stuff. Checked the level
at the audio amp input (in radio mode)on my RCA, and found 6VPP from a local interference-free station, so a ball park level of 3VPP from the old crystal pickups might be usable. Found a Pfanstiehl ceramic at Rad Shack for $15.99, but quoted output is only 0.5VPP. I may give it a try after I try injecting a similar audio tone at the phono input to the radio.

marv

:Well, post back if you find a solution, or can suggest a new cartridge unit that should definitely work as a substitute. I don't know whether or not in those days there were a lot of electrical differences in the cartridges

Frank,
Don't have an audio or RF test generator, so used my kids old electronic keyboard for a test tone into the phono input. Looks like 0.5V audio input would be enough for a reasonable speaker output, but certainly won't overdrive it into distortion. Think I'll order that cheap ceramic cartridge.

marv

:Well, post back if you find a solution, or can suggest a new cartridge unit that should definitely work as a substitute. I don't know whether or not in those days there were a lot of electrical differences in the cartridges

>Found an online post from a guy who replaced the >guts of an old crystal cartridge with a piezo >element from a newer cartridge he had salvaged, so >it looked original, but with new stuff inside. Think >I'll try that too as soon as I find a cheap ceramic >part.

Piezo elements don't work.

>I've been led to believe that the ceramic parts are >nearly eqivalent to the old crystal parts as for >output level.

Send me a photo of your cartridge, I'll tell you what model it is.

Ceramic elements are NOT compatible to rebuild crystal cartridges. I offer a full How-To on my website if you are curious. See http://www.oldradioz.com/forum . Go in Z-Forum and private section, look for the full 8 parts tutorial including sound clips from different stylii.

Z-

:>Found an online post from a guy who replaced the >guts of an old crystal cartridge with a piezo >element from a newer cartridge he had salvaged, so >it looked original, but with new stuff inside. Think >I'll try that too as soon as I find a cheap ceramic >part.
:
Mr. Z,
Whats your email address. Got close up pix of my old cartridge, but won't pay a "Kings Ransom" for a replacement crystal/ceramic or rebuild. Hell, the RCA 67V1 radio/phono isn't worth more than $100, even after complete electronic and cabinet restoration.

marv

:
:Piezo elements don't work.
:
:>I've been led to believe that the ceramic parts are >nearly eqivalent to the old crystal parts as for >output level.
:
:
:Send me a photo of your cartridge, I'll tell you what model it is.
:
:Ceramic elements are NOT compatible to rebuild crystal cartridges. I offer a full How-To on my website if you are curious. See http://www.oldradioz.com/forum . Go in Z-Forum and private section, look for the full 8 parts tutorial including sound clips from different stylii.
:
:Z-

:Mr. Z,
:Whats your email address.

Try: restoration at oldradioz dot com

Z-