Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco prototypes?
#1

I'd almost forgotten about this, but here is something for Chuck and Ron to chew on.

Possibly in the early eighties, I found a chassis that is glaringly Philco, but hand made. It appears at first to be a 116, or perhaps even a 16 chassis. It has only a single end 42 output stage, but the full-serving receiver that a 16 or 116 would be. It is a 5 band set. I put a 116 dial scale on it that I had laying around at the time I got the set. It seems to be the correct one. There had been no scale on it when I got it. The dial drive is not a 16 design, but the 1936 style.

Holes in the chassis are drilled; not punched as in a production build. It has two additional controls on the front of the chassis other than what the regular Philcos had. I haven't traced the schematic, but they appear to be possibly a second tone control or perhaps a sensitivity control and something else. The tube shields are not the regular square Philco style, but ordinary cylindrical generic types.

In addition to the above, I found ANOTHER similar Philco at AWA a few years ago, in a cabinet like a 16 shouldered tombstone, again with two extra controls on the panel. The dial bezel is hand-made, but looks possibly like the factory prototype shop could have done it. I haven't dug into it, mainly because I've forgotten about it. This one looks like anoher prototype, possibly in the same general era. It could be possibly about 1934, if they were prototyping the 116. The dial is the "shadow box" style, as on a 16, 1935 model. (I have one to compare it to)

Indeed, I can photograph the daylights out of the two sets, and I should do some research on them. I wonder if there is any other stuff out in the world that would tie into these two Philcos. I wonder if Ron or Chuck would have heard of anything like these sets.

Mystery of the week!
#2

Doug

The only time I had ever heard of any such sets was in a phone conversation you and I had some years ago, when you mentioned these to me. Thank you for jogging my memory, I had forgotten about them.

Photos would be great, not only for here, but for this new Philco book I have completed, but still unpublished (LONG story).

Those could be prototype 116 sets? But the single-ended 42 output doesn't fit in with their high-end model. Strange.

--
Ron Ramirez
Ferdinand IN
#3

Great! Pictures...pictures.... Icon_biggrin

If they are Engr. Dept. prototypes, they have lived a charmed life to be intact this long and not trashed or re-used/dismantled.

The single-ended 42 stage does sound (no pun) strange.
#4

The single ended 42 is on the uncased chassis, and I will have to look at the one in the cabinet. I suspect that the reason for the simple single end output in a prototype would be that the set was for evaluation of performance and that the audio in the final model would be the "satandard" setup, using the three 42s. We know that Philco's driver and class AB triode output was a standard thing in those days. They didn't push the 42s as hard in the table sets (lower voltages) than in the consoles or the Lazy-X with the big U-2 speaker. Those tubes could blow a "S" speaker through the front of the cabinet, were the listener not cautious.

I took a look at the uncased chassis last night, and it's pretty full. I'd like to trace the schematic, and it will be a real job for that reason.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM

[-]
Who's Online
There are currently no members online.

>