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

Threaded Mode
H-691 Do I need batteries
Ralph
Junior Member
**
Posts: 30
Threads: 5
Joined: Nov 2021
City: Danvers State, Province, Country: MA
#1

04-05-2022, 06:24 PM
Im just getting into this H-691. Do I need to do anything special to run this without A and B type batteries. So far I changed a couple of resistors and electrolytics. I had to order 2000 ohm 10 watt resistor. Thanks Ralph
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#2

04-05-2022, 07:55 PM
You should good to go. No batteries needed in the circuit when operating on ac. The 7.5vdc coming off of R-9 is critical. If too high it can shorten the life of the tubes filaments. Too low there won't be enough emission from the filament for the tube to operate at it's full potential. You would want to be somewhere between 7.0-7.8vdc.

GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
(This post was last modified: 04-05-2022, 07:58 PM by Radioroslyn.)
Find
Ralph
Junior Member
**
Posts: 30
Threads: 5
Joined: Nov 2021
City: Danvers State, Province, Country: MA
#3

04-06-2022, 07:09 AM
Thanks Terry, This is only my 3rd vintage radio for me to work on and wasn't sure about the batteries.Thanks, Ralph
Find
« Next Oldest | Next Newest »
Thread Closed




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
An attempt to remove the Field Coil from a G speaker
Hi Morzh, May be a good idea to remove the cone to prevent damage. You may have to do so anyway to remove the pole ...MrFixr55 — 08:44 PM
Philco 91 Restore Code ??
I think that Danaher, the company that owns Beckman-Coulter (the company that I worked for 41 years) owns Fluke. They a...MrFixr55 — 08:35 PM
Philco 91 Restore Code ??
Rod I wish... :lol: I am not sure I'd buy the Fluke, had it not fell in my lap for free. $500 to $800...it's a lot...morzh — 08:09 PM
Philco 91 Restore Code ??
Mike, ...you get a commission?RodB — 07:52 PM
New member
Hi. I specialize in refurbishing Predictas, but I'm in Chicago. If you can get it to me, I'd be happy to go over it. ...Bob Andersen — 06:43 PM
An attempt to remove the Field Coil from a G speaker
I have 3 G speaker, all with open Field coils. Today I pull one of the shelf and decided to try to remove the FC (spo...morzh — 06:07 PM
Philco 91 Restore Code ??
Thanks Mike. I will check them out.dconant — 05:52 PM
Philco 91 Restore Code ??
There is no such thing as bad Fluke. This said, they are expensive. A Fluke is easily 10x the price of comparable CCC...morzh — 05:45 PM
Philco 91 Restore Code ??
Hello Mike, Yes, I have 3 Fluke meters one being my first Fluke 77 and other being Fluke 87. My third is Fluke clamp -...radiorich — 05:04 PM
Philco 91 Restore Code ??
I knew that Fluke was the Cadillac so with that in mind what Fluke would you recommend I get?dconant — 03:53 PM

[-]
Who's Online
There are currently 4255 online users. [Complete List]
» 1 Member(s) | 4254 Guest(s)
Avatar

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