1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
Odd Heater String 116X
Radioroslyn
Phorum Expert
*****
Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#1

04-19-2013, 09:22 PM
Was looking over the diagram for my 116X and noticed that it uses a hum balance pot to null the 60cy AC on the directly heated output tubes (6A3's). This is a common practice with audio tubes that don't have a cathode. But wait. One of the 6A3's is tied across the pot and the driver tube heater and the RF tubes. The other 6A3 filament is tied across the IF amps,det,and 1st audio. It's filament winding has a ct which is grounded. Pretty Odd!!

http://www.nostalgiaair.org/PagesByModel...013123.pdf
Terry
Find
« Next Oldest | Next Newest »


Messages In This Thread
Odd Heater String 116X - by 7estatdef - 04-19-2013, 09:22 PM
RE: Odd Heater String 116X - by codefox1 - 04-20-2013, 03:54 AM
RE: Odd Heater String 116X - by Mondial - 04-20-2013, 08:48 AM
RE: Odd Heater String 116X - by ipwizard - 04-20-2013, 10:04 AM
RE: Odd Heater String 116X - by 7estatdef - 04-20-2013, 08:22 PM
RE: Odd Heater String 116X - by Mondial - 04-20-2013, 10:09 PM
RE: Odd Heater String 116X - by 7estatdef - 04-21-2013, 02:01 PM
RE: Odd Heater String 116X - by 7estatdef - 04-22-2013, 05:24 PM
RE: Odd Heater String 116X - by Mondial - 04-22-2013, 06:37 PM
RE: Odd Heater String 116X - by 7estatdef - 04-22-2013, 09:12 PM
RE: Odd Heater String 116X - by Mondial - 04-22-2013, 10:23 PM
RE: Odd Heater String 116X - by chris25260880 - 04-23-2013, 11:23 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Philco 60 Squealing
Wondering if I did it backwards. If a coil was wound backwards, the oscillator would not work at all. Old school...Chas — 07:23 PM
Philco 38-7 Speaker
4-ohm speaker. Black, Green leads.tludka — 07:00 PM
Philco 42-390, code 121 speaker
#87 on the schematic.  This radio had a 8" Zenith  speaker attached to it when I got it. I do don't know the hist...Stevelog — 06:39 PM
Philco 60 Squealing
I'm pretty sure I now have the litz wire soldered. This did not make any difference. Back in April I rewound the seconda...dconant — 06:25 PM
Philco 38-7 Speaker
Just to make sure, you chose either 4 ohm into 5K or into 10K? (blk-org or blk-grn)morzh — 06:23 PM
Philco 38-7 Speaker
I have let this one sit because of other duties. Now I am back, and I have a couple of questions. I hooked up a Hammond ...tludka — 05:34 PM
Philco 42-390, code 121 speaker
>>A closer examination of the very small print schematic indicates that the speaker is a PM type. This shows a ...morzh — 05:18 PM
Philco 60 Squealing
Litz is typically tinned by simply rubbing it with the soldering iron tip while immersed in solder (and a bit of rosin f...morzh — 05:14 PM
Philco 6K7
The suppressor grid (if by G3 you mean the S) is usually at the Cathode potential, which in this caes is GND. I am not ...morzh — 05:10 PM
Philco 16B Parts
Thanks for the reply. Unfortunately the radio was removed before bidding was over so I didn't get a chance to bid.dconant — 04:10 PM

[-]
Who's Online
There are currently 4768 online users. [Complete List]
» 2 Member(s) | 4766 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration