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
Philco Battery pack 41-8007
Guest
Unregistered
 
#3

03-13-2008, 10:10 AM
Hi Ron,
If I'm reading the schematic right,the 900 ohm resistor in question is placed in parallel with -9vdc section(via the on/off switch) when the radio is in operation-quite a load on that battery!The AC pwr supply I'm building is actually on the radio chassis itself and is intended to eliminate all the batteries.I plan on using a voltage divider off the center tap of the B+ supply to chassis ground to develop the the negative bias voltages for the audio stages.What I need to know is this 900 ohm resistor necessary with this configuration?
73 de Bill
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
Philco Battery pack 41-8007 - by Guest - 03-11-2008, 10:35 AM
[No subject] - by Ron Ramirez - 03-12-2008, 06:51 PM
Philco 41-8007 - by Guest - 03-13-2008, 10:10 AM
[No subject] - by batterymaker - 03-14-2008, 10:02 AM
[No subject] - by batterymaker - 03-14-2008, 10:06 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
6TPZ and 5TPO Radio Help
Here are the links. 6TPZ and 5TPO The speakers are good. I've tried several known good ones. I just have to fi...R3Sons — 06:27 PM
Philco 91 Tuning Condenser
I just found a set screw. Was able to turn dial just enough to see it and loosen it. I have it off now.dconant — 06:14 PM
Philco 91 Tuning Condenser
Hello, Does anyone know how the dial plate comes off the tuning condenser shaft? The dial itself id so warped I can't...dconant — 06:01 PM
Eico 368 TV/FM Sweep Generator
Ron, for the future: In order to change the name of teh topic, 1. Go to the very first post. 2. Hit "Edit...morzh — 04:29 PM
6TPZ and 5TPO Radio Help
Transistors are easy. No converters. If you have input voltage, then just put some signal through. Or touch your fin...morzh — 04:25 PM
462ron
Hi Mike, I believe I tried different ways to change the header for my post but no luck. Anyway thanks for changing it fo...462ron — 04:02 PM
6TPZ and 5TPO Radio Help
Since these radios operated in harsh environments (temp changes and vibration) you could touch a soldering iron to all t...GarySP — 03:18 PM
6TPZ and 5TPO Radio Help
Thank you Gary. Hi Morzh. These radios are 6 transistor radios. Sadly no tubes. Thanks though.R3Sons — 02:19 PM
Heathkit Sweep Generator TS-4
Ron Instead of Quick reply, go to New Reply, then go to the title of the very first post, and change the title text the...morzh — 02:00 PM
6TPZ and 5TPO Radio Help
I am not a specialist in car radios. I suspect they might use vibrators to convert 12V to acceptable tube voltages, so ...morzh — 01:58 PM

[-]
Who's Online
There are currently 10081 online users. [Complete List]
» 1 Member(s) | 10080 Guest(s)
Avatar

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