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

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

Linear Mode
Odd Heater String 116X
Radioroslyn
Phorum Expert
*****
Posts: 7,294
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 »
Thread Closed


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: 5 Guest(s)
[-]
Recent Posts
Philco 46-480 Electronic Restoration
Make sure th eperson who answered is not a scammer (lots of these there now) and the Trus A S, whoever they are and wher...morzh — 12:38 PM
Philco 40-120C Filament Wiring
I would disregard everything that is there now. I do not know who and when changed it. 1. Make sure that what you thi...morzh — 12:36 PM
Model 27-84 BUZZ?Humm?
Depends on the type of hum. SOme is made by outside devices. Try installing an X-cap (0.2-0.5uF) across the AC line, ...morzh — 12:23 PM
Philco 40-120C Filament Wiring
Thank you for your replies. That is the correct schematic and pin out diagram for the rectifier. The resistance acro...bluecap — 11:01 AM
Philco 46-480 Electronic Restoration
Late last night a guy reached out in response to my posting on the Antique Radio Forum and suggested I contact Trust Aut...jrblasde — 11:01 AM
Philco 630csx power cord
Have you opened up that plug? It may be that the third wire is connected to that brass stud on the side of the plug and ...Arran — 02:57 AM
Model 27-84 BUZZ?Humm?
I would have to look at the schematic but it's not uncommon in 1930s AC radios to have the negative of one filter cap co...Arran — 02:46 AM
Model 27-84 BUZZ?Humm?
Hello Bruce, First all do mean a 37-84b ? Did you take any before and after pictures ? is it a buzz like when you touch...radiorich — 01:59 AM
B&K 1077B no video - problem solved
Hello Tim, Yes, I even check all of my replacement parts when I install them and I too had a capacitor go bad not long a...radiorich — 01:54 AM
B&K 1077B no video
I got back into it tonight. Problem found and resolved! Sometimes it helps to take a break and think things over. It was...TV MAN — 12:40 AM

[-]
Who's Online
There are currently 3367 online users. [Complete List]
» 3 Member(s) | 3364 Guest(s)
AvatarAvatarAvatar

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