Sirs . . . . .

Two Points:

ONE:

That schematic has certainly had some cut out editing done unto it and I would offer to redraft it and clarify parts values IF one or BOTH of you two that have just requested the schematic for the unit . . . . . would compare and feed me back the parts values that you have found used in your sets.

My values in question . . . . .

On the 12BA6 RF amp tube are its plate and screen ? dropping resistors both being 18 K units ?

Also the 18K ? grid resistor of the following osc section of the 12BE6 ?

Cathode resistor of the 12BA6 IF amplifier is being a 150 ohm value ?

The PC-50 couplate has a 47K and two side 100 pf caps . . .almost a given on the legibility of those parts.

The series arranged volume controls, with the left one being the "proprietors" limiting one and the right one being the customer adjustable unit are being 500K units ?

(This overide/volume limit procedure went back to external FULL size speaker radios days. . to constrain max volume obtainable .

But would be of less merit on this units small pillow speaker.)

The PC-70 couplate has has a pair of 470K side resistors and a pair of 250 pf capacitors and a central .005 ? uf cap.

The cathode resistor of the AF output stage is a 150 ohm ?

What value and voltage rating do you find the unmarked cap from the plate of the 35C5 plate to its cathode being ?

IF ? it is even marked . . . . the small tone control choke T5L56A ?. . . part number associated with the tone control circuitry.

Is it being #30100 ? for the AF output transformer?

Are the IF transformers cases being marked as #30053 ?

The osc coil may be unmarked, if not being housed, but is it #30202 if marked ?

The SMALL AC convenience outlet may also be unmarked . .I'm guessing . . . .#32079.

Lastly moving to the bottom center power supply section of the chassis at the surge resistor for the power rectifier . . . .reading as 27 ohms.

The intermediate B+ dropping resistor between the filkters . . . . . is it being 390 ohms ?

Lastly the series cold/hot thermistor # 33400.

Test and log down its resistance Dead Stone Cold . . Steve Austin then run the set for 30 min and unplug the radio from the AC source and make a FAAAAAAAAST

resistance check of its hot resistance.

Then we can see what modern part number can currently be used as a sub IF one finds a radio, having had this part gone bad.

One couldn't do this evaluation later on . . . . . AFTER an OEM unit fails!

The schematic is "personally" cursively marked with "SW yellow? + green" and over to the schemas other side is "Green middle"

I interpret that as the green being the wire closest to the center of the wiring bundle which would make the adjunct timer switchs #2 terminal having the green wire on it and #1 having the yellow wire going to it . . . . .confirm that .

TWO:

(Finally)

Au contraire . . . . Messr Bill G . . . I an seeing that mid schematic 12AU6 functioning as an ultra fast noise supressor/chopper.

This set has a better than normal design in the respect of it having a frontal RF stage, albeit, just using RC coupling on its plate circuitry, vice a full tuned LC tank circuit.

ADDITIONALLY . . . in this time frame/era there was ALSO the Magic Fingers / Vibrating Bed to ease you of some more of your pocket change.

They used brush motors for their moderate large energy requirement to shake the "mass".

AC/DC Motor Sparky-Sparky means static trashing other than local AM stations on the radio.

With the supressor circuit turned on by the slide switch at the rear of the unit, it grounds the cathode of the 12AU6 and makes that circuit fully operational.

A fast rising incoming noise spike from the cold side of the first IF amp turns the 12AU6 stage into heavy temporary/durational conduction.

Look at the B+ plate supply path of the 12AU6 and you will see a 27K plate resistor and its left side ADDITIONALLY feeds on upward to the 470K plate load resistor of the 12AV6 1st audio stage.

For the duration of HEAVY conduction of that 12AU6 stage, the B+ feed is being robbed from feeding the 12AV6 stage, so there is a micro quick chopping off of the audio for that short static bursts duration.

Sooooooooooooo . . . . my circuit tracing CONFIRMERS . . . . . (I be 'de CONFIRMEE . . . . deah' Andy) . . . . . I do NOT expect the AVC buss to be connected to the 12AU6 1st grid circuitry.

We need a + going bias (pulse) coming to the 1st grid of the 12AU6 to get it into HARD turned on conduction . . . .and AVC is basically variant values of - voltage.

Plus that immense .05 and 2.2 meg AVC time constant would be unfathomable. . . . . . . when compared to the FAST rise and fall times of a single static pulse.

With the cold side of the 1st IF transformer feeding to the 12AU6 1st grid is just like a detector plate of a 12AV6, and the present RC time delay is the tubes mere interelectrode capacitance being presented.

Thus making for one FAST pulse switching capability of the 12AU6 stage.

CONFIRMERS . . . .measure and feed me the earlier discussed schema clarifying info.

Thasssit . . . . .

73's de Edd