Hello Edd,
Thanks (as always) for your painstaking and thorough advice. As you've uploaded the images for me, I'll go to the questions, which you have anticipated.
So,

i) I do not have the matching power supply. One of these days I'll get a radio that I can just plug into a wall socket and 'away we go'...
If you have any suggested sources for such a supply I'd be grateful. Perhaps an ARBE III might do it, though I think the maximum 'A' voltage on that is 4.5VDC. I'll check with the maker.
ii) What is the B+ voltage likely to be (90VDC?).
iii) I'm not quite sure how the 6V would be hooked up (I do have a power supply/battery pack with a + and - 6V wire). Is 'Ground' in this case just 'Minus' or 'Positive'
iii) (Reading from the schematic) Would one hook up multiple wires from the 6VDC power supply to all the 6V 'On' tabs on the 21 pin Jones plug?
iv) As for the connectors, the B+ comes in at pin 2; what would you have coming through at pins3-6 (see diagram)?

So many questions (sorry), but I don't want to blow this one (literally). Any advice greatly appreciated.

Hi Edd,

Many Thanks for the help, and I can certainly give you any information/images re. 'the internals'.

The numbers for each terminal on the Jones plug are stamped into the inside surface of the bakelite plug block.

Let me try to focus my questions. So, if one imagines an A voltage 6VDC power pack: two wires coming out of it: one marked Negative, the other Positive. Which one of these would be connected to GROUND at Pin 1; the positive wire or the negative one?

As for the 6VDC 'on' current, would one take the remaining wire (whether that is positive or negative) and then branch off multiple wires to pins 7-10-13-16?

The 6V battery pack I have consists of four 1.5v 'D' cells. I'm not sure whether these would have the 'umphff' to light the RCA filaments or whether I need something stronger. The ARBE 'A' voltage is a maximum of 4-5 I think. Opinions please. Today I saw a 6VDC adapter at Radio Shack, but it was only rated at .8A

Have a great evening,

Leslie

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: : : : : : : : : :SIR Leslie . . . . : : : : :I think that it will take a bit of transferring of data back and forth with you being my eyes . . .since I’m blind. : : :I can’t see the internal connections that are involved with that 21 terminal Jones plug. : : :A bright light inspection of its blades should reveal the nearby terminal number assignments. :As far as the filament connections to the unit , they seem to be just as the sheet gives them, and are to be interconnected as shown. : : :The info is showing pin number #1 as being the filament ground and then you need connections from filament connection pin numbers 8-11-14-17 and 20 also joining to that #1 ground connection. : : :Now as for the filament connections that need to be receiving the hot 6V filament supply, that would be 7-10-13-16 and 19 and the :current capability of the supply needs to be at least 2 amperes, when I total up the cumulative filament currents . : : : : :THAT should be a supply that you could get from your “ARBY III BURGER”, since it shows on upwards of 3 amp capability. : : : :Then, in looking at the B+ available from the “ARBY III BURGER”, it looks like its current capabilities might just fit the bill also , but the 135 B+ might be a bit lower than RCA was using, but try it initially, as that should get it talking for you. : : :The B+ insertion point shows to be on pin #2 and the common B- . . . .ground . . .would be shared with the 1-8-11-14-17 and 20 cluster. : : :I would think that those 4 connections would get it going. : : :And then, for the refinement of turning the set on and off, via those switches, you would need to inspect the internals to confirm that the SW1 and SW2 switches merely are connected to those pins. : : :If that is the case then, the SW1 might be inserted in series with the A (or B) supply to connect / disconnect that supply from the receiver. : : :While the SW2 would be inserted in series with the B (or A) supply to connect / disconnect that supply from the receiver. : : : : :If examining the switches finds a lower current rating on one switches contacts, that one would be the one to be assigned to B+ switching, while the higher rated switch would be for the heftier A supply switching. : : : :Standing back . . . . . .waaaay back . . . . .for feedback . . . .or random spurious oscillations ? : : : : :73's de Edd : : : :

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Hi Edd,

I just found out that the ARBE III 'A' supply is
adjustable from 1.25 to 6.5 VDC@ 3.0 amperes continuous, 3.25 amperes intermittently. Less than 1 mv rms ripple at full load. So there should be power there assuming I can connect the wires properly.

I'd like to be able to use another power supply setup as the ARBE is permanently hooked up to another old battery radio (an AK-20).

Cheers,

Leslie

Hi Edd,

Thanks again for your unstinting information and advice; that's a great idea about the 'slave' radio being used as an AC/DC adapter and I might end up doing that. Someone I am in contact with, who has one of these AR-8711s says that the B+ is 220-230, which is too high for my ARBE III.

That's a higher voltage than I've ever seen from a vintage Adapter (the ones I've encountered run at 45, 67.5, 90 or 135V. I have made battery packs (of modern 9V square batteries, hooked together in series) while experimenting with two 1958 Motorola transceivers; the latter have subminiature and one full-size vacuum tubes, and I can get the set to work.

Whether a 230v battery pack can light up the AR-8711 is another matter...not enough amps perhaps?

Anyhow, I've got several old transformer chasses around (and I do have an isolation transformer and Variac on the bench)and may try the 'slave' chassis approach. I'll be back to you on that :o)

Have a great weekend,

Leslie
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:Sir LESLIE. . . .
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:So, if one imagines an A voltage 6VDC power pack: two wires coming out of it: one marked Negative,
:the other Positive.
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:Which one of these would be connected to GROUND at Pin 1; the positive wire or the negative one?
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:THAT WOULD BE THE NEGATIVE LEAD OF THE POWER SUPPLY, IF USING A DC POWER SUPPLY, IF AN AC
:VOLTAGE, IT WOULD BE IRELEVANT.
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:As for the 6VDC 'on' current, would one take the remaining wire (whether that is positive or negative)and then branch off multiple wires to pins 7-10-13-16?
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:THAT IS CORRECT, IT WOULD BE CONNECTED TO A WEBBED AND COMBINED BUSS OF ALL 0F THOSE MENTIONED CONNECTIONS.
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:The 6V battery pack I have consists of four 1.5v 'D' cells. I'm not sure whether these would have the 'umphff' to light the RCA filaments or whether I need something stronger.
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:THAT WOULD BE. . . . "OOMPH'. . . IN PUTTING IT ON THE NEXT GRADIENT UPWARD.
:FRESH ALKALINE "D" SIZE CELLS HAVE AN INSTANT PEAK CURRENT CAPABILITY OF 5-6 AMPS, SO YOU COULD ONLY EXPECT A CONTINUAL USE OF A SET FOR ~ 2 HRS FOR YOUR UNITS FILAMENT SUPPLY.
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:The ARBE 'A' voltage is a maximum of 4-5 I think. Opinions please.
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:THAT WOULD BE UP TO . . . 6.5 VDC, . . . BY YOUR OWN CORRECTING OF THAT SPEC.
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:Today I saw a 6VDC adapter at Radio Shack, but it was only rated at .8A
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:OF NO DUE CONSIDERATION, AS IT'S CURRENT CAPABILITY IS NOT EVEN IN THE BALLPARK.
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:Final Synopsis:
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:The way that I see that unit of yours, in respect to it having that Jones connector on the rear, is to permit the flexibility of its use in multiple user environs.
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:With all of the separate access points to the units filaments, that would leave the option of that plug mating up with a main power supply used in a mobile appplication that COULD be supplying 6VDC, or 12 VDC or 24VDC or 28VDC, with them having all interconnect wiring arranged so that the proper filament voltage is reaching the receiver.
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:Should it be receiving land use, it more likely would be utilizing 6 VAC for the filaments with a second possibility of 12 VAC.
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:The B+ is a given, with it receiving from ~ +135 vdc on the low possibility on upwards to ~ 180 VDC
:on the probable high spec.
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:You can snoop on any utilized and supplemental B+ electrolytics inside, and see if they are spec'd at a 250 VDC rating, but if you are finding any 350 VDC ratings, the unit might have been using upwards of around 220 VDC B+ on it.
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:As I mentioned, I think that you will find the switches as merely being in and out connections, to be used for making remote switching connections, and probably not being connected to any circuitry inside . . .confirm that.
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:The last consideration, would be the pilot light or any illumination lamps which schematically also have joining resistors associated with them.
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:That would typically relate to dropping voltage to them, when wired to be used in those higher supply voltage situations.
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:A Final thought:
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:If your "ARBY BURGER III" is hardwire committed to another receiver unit.
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:AND I don't know, or remember, what other tube electronics gear that you have, but if you have another transformer powered radio. (AC line isolation - safety aspect) . . . no sparkee-sparkee ! chassis au chassis.
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:And, if that receiver is using five or six . . . . 6 v tubes, how's about getting that set operating and find out what its main B+ level is, as well as the sub B+ which is usually just past an inductive filter choke . . .or more likely, just a power resistor between its 1st and 2nd electrolytic filter stages.
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:Now, are either of those levels near that dee-sired RCA B+ voltage level?
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:It certainly would not be considered dirty pool, if you were to pull all of its tubes, except the power retifier and then connect 2 wires for your 6 VAC supply and 1 for B- ground wire and another wire for the B+.
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:[Caveat. . .if your slave receiver has one filament wire grounded to chassis, throughout the tube wiring, be sure THAT wire ends up on the Jones # 1 and its cluster of filament wires.]
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:You then plop down the sets side by side and connect the 4 wires into the RCA units Jones connector and power up and see if the Ruh-Cee-Ayy will then flip-flop and fly.
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:Then you can place a series connected DC milliameter in the B+ line and run the volume to max, that will reveal the maximum current that your RCA receiver consumes.
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:That info would then come into play towards building a dedicated power supply for the RCA unit, along with its additional need of supplying 6.3 VAC @ 2 A for all of the sets filaments and pilot "bub".
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:Thasssitt . . . . with no munny uh bein' spint . . .( I'm cheap . . .errrr . .no . . . make that frugal!)
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:73's de Edd
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