Recapped My Predicta Tandem, I don't know what to do
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
Two of the wires are for the AC tube filament supply.
Sounds like your horizontal frequency is way off. The frequency is determined by one of the couplates near the 6CG7 tube. There is also a coil with a mica cap in parallel that should be set to resonate at 15,750 Hz to help the oscillator stay in tune.
When you are feeding a signal the AFC circuit is trying to get the frequency right. Predictas tend to freak out like in you photo when the horizontal get too far off frequency.
Have you tried adjusting the slug in that horizontal coil? The frequency range control plays a part here too.
You should go through the horizontal setup procedure outlined in the service info.
(This post was last modified: 01-05-2022, 09:33 PM by Bob Andersen.)
Messages In This Thread
RE: Recapped My Predicta Tandem, I don't know what to do - by Bob Andersen - 01-05-2022, 09:33 PM
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
Philco model 38 code 121 not receiving signal.
|
| Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| morzh
Short-circuited turns can be considered as a half-dead transformer.
But on this case transformer will hot and s...Vlad95 — 11:01 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM |
|
Philco model 38 code 121 not receiving signal.
|
| Good news everyone! I think I have found everything I need for rewinding the antenna coil primary.
I found some pla...Stormlord5500 — 09:40 AM |
|
Philco Battery-WWII vintage
|
| My younger sister went to SUNY Plattsburg NY, (BS, MS, RN) in the late 1970sabout 10 min from the Northern NY / Canada b...MrFixr55 — 07:59 AM |
|
Philco Battery-WWII vintage
|
| Hello Bob,
What Amazing find!
Sincerely Richardradiorich — 10:19 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| Hi Murf,
Do this:
Monitor between ground and one plate of the rectifier while playing the radio. Do the same with ...MrFixr55 — 09:51 PM |
|
Philco Battery-WWII vintage
|
| Mike;
I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM |
|
Philco 42-345 Restoration/Repair
|
| The more the better. (Within reasonable limits.)
2-5 times more is no problem in this case.Vlad95 — 03:50 PM |
|
Philco 42-345 Restoration/Repair
|
| Thanks, RodB and Vlad95,
I was mainly trying to figure out this capacitor to locate a replacement, Vlad thank you for...osanders0311 — 03:44 PM |
|
Who's Online
|
There are currently 1473 online users. [Complete List]
» 1 Member(s) | 1472 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
