Unkown Radio schematic need

11/21/2011 2:32:16 AMWarren

12A7 12F5 50L5 35Z5 Oscillator and IF in one single can.

11/21/2011 6:45:47 PMBob Masse

:12A7 12F5 50L5 35Z5 Oscillator and IF in one single can.
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:Warren,
Is that a typo on the 50L5?
Bob
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11/21/2011 6:56:38 PMWarren

That's what it has in it. ( No Tube Chart ) There is a big dog bone type dropping resistor in the heater line. The set does light up, and heater string is correct voltage. The problem is the single IF can has the oscillator coil on the same form. Two broken wires.

11/23/2011 7:11:06 PMBob Masse

:That's what it has in it. ( No Tube Chart ) There is a big dog bone type dropping resistor in the heater line. The set does light up, and heater string is correct voltage. The problem is the single IF can has the oscillator coil on the same form. Two broken wires.
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:Hi! Warren,
I got a clue of where to look from this here :
http://en.wikipedia.org/wiki/Plate_detector_(radio)
But everything still comes up with a 50L6. Could you send a picture of that 50L5? I'm curious to see what it looks like.Tks.
Bob Masse
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11/23/2011 9:20:21 PMFred

Betcha it's a 50L6 with part of the 6 worn away.

11/23/2011 10:00:37 PMWarren

Thought I typed 50L6. I see I didn't It's a TRF radio.

11/23/2011 11:13:53 PMEdd

Sir Warren. . . . .

Prithee kinde Sire . . . . doth this be " OUR " / "THE" . . . Warren . . . ? ? ?

( Who wouldn't typically be fielding questions of this nature ). . . . to wit . . .

50L5 . . . . . certainly there is no such animal . . . now as for it being a 50L6 that would take care of the Audio output aspect along with the 35Z5 taking care of the power supply fulfillments for the receiver.

That then has the 12F5 simple triode as being either an RF functional or as 1st audio amplifier/and / or detector.

That then leaves a 12A7 as the ODD BALL . . . with it being the equivalency of both of the the prior mentioned 50L6 power amp and 35Z5 power rectifier within one envelope , PLUS it throws away your 150 ma series filament wiring assumption. . . . as its a 300 ma filament.

Also, a 12A7 is certainly not going to fulfill the needed frontal RF tube aspect for the receiver.

Also, the initial suggestion of it being a Superheterodyne ?

Then the coming back with it being a TRF unit ?

The need of LARGE POWER DROPPER resistor . . . . now those initial 3 tubes almost eat up 97 volts of your AC power with only a slight further voltage drop being needed.

How's about doing some further REE-search for us (and that's heavy on the REE ):

E.G. what tube numbers pins does the sets AF output transformer get wired into . . . . . and same is true of the RF inductor/transformers connections to their tube(s).

Are there any more RF coils or loop antenna or connections for an external antenna, being in the sets RF coils lineup ?

Standing by . . . . .

73's de Edd

Nothing is fool-proof to a sufficiently talented fool.

:Thought I typed 50L6. I see I didn't It's a TRF radio.
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11/24/2011 12:07:55 AMWarren

This radio was found in as is condition. The 12F5 0ctal seems correct for the first RF tube from the antenna coil. The 12A5 apparently does not belong in the socket. The 50L6 is wired correct for the audio output. The 35Z5 is being the rectifier. Looks as if way in the past this set has been modified. Has brass rivets holding tube sockets. A strange TRF set.

11/24/2011 12:38:31 AMEdd

Sir Warren . . . . .

So it IS Warren . . . .

And that other tube numbering I.D. error on the 12A7 is that it was a 12A5 . . . . which is STILL giving us an A.F. output tube .

How about looking at the volume control and its derived audio input source line from the preassumed detector area of the set.

Possibly the missing tube is a pentode / diode which would be pretty hot in using a pentode in amplifying RF following that initial triode front end with the diode section providing for the detected audio.

See if a 12SF7 might agree with the wiring present in that area . . . other wise find the pins that are close to ground . . . if utilizing a cathode resistor, as well as the tube pins having B+ on them, and if there seems to be a screen dropping resistor connected into that mystery tubes circuitry.

That 12SF7 will sort of give you a marker with its pins 7 and 8 being used for filaments vice the commonly experienced pins 2 and 7 on octals.

73's de Edd

Appearances are not everything; it just looks like they are.

:This radio was found in as is condition. The 12F5 0ctal seems correct for the first RF tube from the antenna coil. The 12A5 apparently does not belong in the socket. The 50L6 is wired correct for the audio output. The 35Z5 is being the rectifier. Looks as if way in the past this set has been modified. Has brass rivets holding tube sockets. A strange TRF set.
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11/24/2011 12:57:28 AMEdd . .witjh mo' info . . .

Sir Warren . . . . .

Hey . . .I can't see the sets additonal parts but, now also throw in these two possible options since 3 of the tubes are now being known.

>
> > > SAME 3 TUBES LINEUP .. . CHASSIS < < <

73's de Edd

All probabilities are really 50%. Either a thing will happen or it won't.

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:Sir Warren . . . . .
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:So it IS Warren . . . .
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:And that other tube numbering I.D. error on the 12A7 is that it was a 12A5 . . . . which is STILL giving us an A.F. output tube .
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:How about looking at the volume control and its derived audio input source line from the preassumed detector area of the set.
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:Possibly the missing tube is a pentode / diode which would be pretty hot in using a pentode in amplifying RF following that initial triode front end with the diode section providing for the detected audio.
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:See if a 12SF7 might agree with the wiring present in that area . . . other wise find the pins that are close to ground . . . if utilizing a cathode resistor, as well as the tube pins having B+ on them, and if there seems to be a screen dropping resistor connected into that mystery tubes circuitry.
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:That 12SF7 will sort of give you a marker with its pins 7 and 8 being used for filaments vice the commonly experienced pins 2 and 7 on octals.
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:73's de Edd
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:Appearances are not everything; it just looks like they are.
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::This radio was found in as is condition. The 12F5 0ctal seems correct for the first RF tube from the antenna coil. The 12A5 apparently does not belong in the socket. The 50L6 is wired correct for the audio output. The 35Z5 is being the rectifier. Looks as if way in the past this set has been modified. Has brass rivets holding tube sockets. A strange TRF set.
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11/24/2011 1:15:33 AMWarren

The Warwick is a good match. Thanks.