Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 38-3 alignment
#1

Completely following the instructions for aligning the Philco 38-3 on the schematic and completely getting nowhere.  Performing the IF align first, then moving to the RF.  The mag tuning switch is closed.  I have a digital frequency counter in line with my signal generator.  I connect the signal gen lead to the cap of the  6A8G, and have tried it with and without the usual lead also attached. Negative for the sig gen is attached to the chassis.  Once I think I've lined up the IF circuit, I can hear the tone continue as I turn the dial to the first position for starting the RF alignment.
The closest I'm able to get is about 60 KC away from where a station should be.  IE, 1080 is coming in at 1020, 650 is coming in at 590, etc.
When the rotary dial is fully closed, it's in line with the tuning gang, so I know it's not off.

I'm getting plenty of clear stations, they are just not in the right place!!!!! Icon_crazy


Messages In This Thread
Philco 38-3 alignment - by DuMont - 05-10-2020, 03:23 PM
RE: Philco 38-3 alignment - by RodB - 05-10-2020, 04:11 PM
RE: Philco 38-3 alignment - by DuMont - 05-10-2020, 04:15 PM
RE: Philco 38-3 alignment - by DuMont - 05-10-2020, 04:34 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT-6 antenna connections
Thanks. I never realized that was a notch noted in the schematic as described. I’ll recheck my wiring.bridkarl — 08:13 PM
Cannot Adjust an IF Transformer’s cores
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a ...jrblasde — 08:07 PM
PT-6 antenna connections
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4. Yes, pin 6 of the 7C6 is...RodB — 07:34 PM
bridkarl
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM
Cannot Adjust an IF Transformer’s cores
Joseph, now you are an engineer!!RodB — 06:37 PM
PT-6 antenna connections
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM
40-150 General questions
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM

[-]
Who's Online
There are currently 3374 online users. [Complete List]
» 4 Member(s) | 3370 Guest(s)
AvatarAvatarAvatarAvatar

>