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

Help on A Sparton 813
#1

Well, it looked pretty good on E-Pay, and arrived as a "Kit" with the cabinet in 4 pieces. A barn special at best. Again, split veneer on part of the top, but at least the buttons are still good. This one has mechanical tuners for the pushbuttons where you tune a station, lock the button by squeesing it shut, and it "remembers" Cool.

Also, this set uses two 1A5 pentodes in parallel for the output. I've never seen this arrangement before in a radio, but with a little digging, I see that there were also Philco's that used a similar arrangement. Why. I'll never know, since each pentode would give .1 watt on it's own. And, remember this is a battery set, wasn't there a better way to do it?

Anyway, one of the 1A5's is missing from the set, and I am wondering if I can get by with just one. I know the volume would be diminished somewhat. I was also thinking about making a socket adapter to run a 3V4 to do the job of both tubes, which would be 100% reversable.

Building a little A-B power supply should be trivial.

I am wondering if anyone out there has tackled one of these before.

Box number 2 of the same auction has not been opened yet. Equally bizarre , I hope. Stay tuned.


Messages In This Thread
Help on A Sparton 813 - by codefox1 - 04-08-2009, 05:16 PM
Re: Help on A Sparton 813 - by Texasrocker - 04-10-2009, 03:23 AM
Re: Help on A Sparton 813 - by codefox1 - 04-11-2009, 10:22 AM
Re: Help on A Sparton 813 - by Texasrocker - 04-12-2009, 01:14 AM



Users browsing this thread:
[-]
Recent Posts
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM
B&K 1077B no video
Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM
B&K 1077B no video
Hello Tim, Here is a link to restoration of one on Phil's old radios site ! Sincerely Richard bk1077bradiorich — 09:01 PM
6TPZ and 5TPO Radio Help
I'm a little befuddled on this one. Should X5 and X4 be tied together like this?  It looks like someone added this at so...R3Sons — 07:33 PM

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

>