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 #20
Hello again fellows , well I powered up the set this evening after I had changed every cap and resistor in this set and ...onlyrick — 09:34 PM
Zenith H725
Yes - better it happened on the repair bench than returning to the owner. The other question is - do I also dissect a...EdHolland — 09:08 PM
Zenith H725
That's a bummer but get them now. Paul BPaul Philco322 — 08:27 PM
Zenith H725
I completed the insulation on the cabinet interior (Al foil and hi temp silicone rubber), and reglued the speaker gasket...EdHolland — 06:18 PM
HiFi (Chifi) tube amp build - but my own design.
Tim - Photos of 8 octal tube sockets. (Top and bottom) Send me a PM if you're interested.RodB — 04:11 PM
VTVM meter moves when my hand is next to it & not on
Haha! I hope so. It seemed rather lost and forgotten languishing in the frozen Northeast of England.EdHolland — 02:36 PM
VTVM meter moves when my hand is next to it & not on
Ed - it's in the Cayman's enjoying the good life.RodB — 02:14 PM
VTVM meter moves when my hand is next to it & not on
Static electricity - but the other chaps beat me to it again. I've seen this before with analogue meters. I've also ...EdHolland — 01:56 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM

[-]
Who's Online
There are currently 1201 online users. [Complete List]
» 6 Member(s) | 1195 Guest(s)
AvatarAvatarAvatarAvatar
AvatarAvatar

>