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

tuning question
#1

Hi All;
I ask this question because I am unsure.. Which is the Tuning Capacitor set at for about 600KC, is it mostly open or mostly closed (plates meshed together) ??
When I have my Tuning cap mostly closed (plates meshed together) I have my Oscillator at 1010KC, but If I am at the wrong end of the Dial, then I need to reset my Oscillator with the tuning Capicator set almost fully open for my 1010KC.. I am happy that I can get this to operate at all on the Breadboard setup..
I have both the RF coil and the 1C6 converter tube and the Oscillator coil, as well as my Tuning Capicator all on the Breadboad.. My Oscillator coil is one I wound on a Blank (junk) form.. And the fact that it is working at all is encouraging.. I figure I need to get it working correctly on the Breadboard, before subbing parts from the Radio or trying to make this part of the Radio work.. I can make my trial and Error progress on the Breadboard first, it is much easier to change things arround..
THANK YOU Marty
#2

Fully closed is ~530 KHz. Fully open would be between 1500 and 1700 KHz, depending upon design. 1010 would generally be just a bit past the middle, toward the high end. I've found the middle to generally be around 950 or so. These of course are very course approximations, usually one would use the dial scale on the radio. If the dial scale is attached to the cabinet, you can place a piece of tape on the dial scale, pencil in the primary frequencies, then move the piece of tape to the chassis.
#3

Hi All;
THANK YOU Brenda Ann, that is exactly what I need to know.. So I have it correct.. Sorry about the confusion about the 1010KC, that is the Frequency that I have my Oscillator set to, If my math is correct..
1010KC - 460KC (IF Frequency) == 600KC.. or 600KC + 460KC = 1010 KC.. Right now I am persuing why I am NOT getting a louder tone from the Audio Amplifier, than I am..
I found out why my audio wouldn't go thru, I had the "Tone Control" on the wrong setting, the tone control was filtering out the Audio "HUM" I was sending to the Radio..
I can now send from my 1st IF all the way thru the Radio, but not a signal fed from the "RF" Grid of the mixer Tube, it comes thru but very weak..
THANK YOU Marty
#4

Hi All;
I can now get the signal from my Oscillator to come thru the Plate, Via a Capacitor to my scope.. So the Oscillator signal is being passed thru..
Now to find out what or why the "RF" signal is not going thru or maybe not strong enough signal to affect the outcome..
THANK YOU Marty




Users browsing this thread:
[-]
Recent Posts
Philco Model 38-7: what caps & resistors do fail typically?
Since you stated earlier, you have a console 38-7XX.  They also had a 38-7T (table), and 38-7CS (chairside).  A very nic...GarySP — 01:18 PM
Part numbers to model cross
That I wouldn't know, but sometimes the radio document itself shows one, same as the capacitor cans' etc pinouts.morzh — 12:46 PM
Part numbers to model cross
Thank you morzh, that is exactly what I was looking for. Now , is there some where that shows pinouts for Philco power ...Jim Dutridge — 11:37 AM
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM

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

>