2nd IF Transformer Question
Posts: 189
Threads: 22
Joined: Aug 2018
City: Kewanee
State, Province, Country: Illinois
Good morning all, I’m working on my 60L and have been going though the transformers. Yesterday I rewound the primary on the oscillator: The antenna looked and tested great. The 1st IF tested to the specs on the schematic, but the 2nd IF tested bad unless the schematic is incorrect. It shows values of 34 ohms and 85 ohms and mine tests out at 35 and 46. Is the 85 on the schematic incorrect or is the one winding bad? If it is bad can I rewind it? If so what size wire and how many turns? Thank you!
1929 Victor R-32, 1933 60L, Phil 40-158, Phil 42-400X, Phil 47-1230 Radio/Phono,, 1950 Phil TV t-1104, Air King 4000, Philco 41-105, Philco 37-675, RCA Victor 9K2, PT-50, Phil 54C, PT-44 Cabinet, Phil 118X Cabinet
Gregg 
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
I would test it in operation prior to doing anything else. It is probably OK. They are tough to rewind.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 189
Threads: 22
Joined: Aug 2018
City: Kewanee
State, Province, Country: Illinois
Thank you sir, that’s what I will do then. What symptoms would I see if it is not great?
1929 Victor R-32, 1933 60L, Phil 40-158, Phil 42-400X, Phil 47-1230 Radio/Phono,, 1950 Phil TV t-1104, Air King 4000, Philco 41-105, Philco 37-675, RCA Victor 9K2, PT-50, Phil 54C, PT-44 Cabinet, Phil 118X Cabinet
Gregg
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
It will either work or it won't. Won't meaning - No or very low level to the 2nd detector stage - unable to tune.
That kind of winding on a secondary can sometimes have corrosion problems but there isn't usually much current so they don't burn open like a primary. SOMETIMES the tuning (caps) can be the problem.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 16,310
Threads: 569
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
It is rarely n RF coils that there's continuity and it is bad.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 189
Threads: 22
Joined: Aug 2018
City: Kewanee
State, Province, Country: Illinois
Ok, sounds good. I’ll see how it does once I get it all back together. Thank you both for your input.
1929 Victor R-32, 1933 60L, Phil 40-158, Phil 42-400X, Phil 47-1230 Radio/Phono,, 1950 Phil TV t-1104, Air King 4000, Philco 41-105, Philco 37-675, RCA Victor 9K2, PT-50, Phil 54C, PT-44 Cabinet, Phil 118X Cabinet
Gregg
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
91H Code 126 Restore
|
| When it comes to the cloth covered power cords, if they are not frayed, and are flexible, and if I can bend one without ...Arran — 06:21 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| Could be. The central cylinder is OK, but the sides are...well. What's done is done.
I wonder if some standard bobbine w...morzh — 06:02 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| Mike;
As I was saying it doesn't look like they used much of a bobbin for the field coil, not like a Magnavox one wou...Arran — 05:49 PM |
|
Atwater-Kent 84, restoration.
|
| This AK84 was bought, I think, last fall.
For a whopping $100.
It has been, according to the seller, restored.
As I go ...morzh — 05:48 PM |
|
Philco model 60
|
| Plus I forgot that I have a spare complete Philco FC speaker, that would work perfectly, now that I don’t need it. Got i...Radios1340 — 05:36 PM |
|
Philco model 60
|
| Duh! I guess I can’t read an ohm meter today. I took the oscillator coil out and will take some readings tomorrow.Radios1340 — 05:30 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| Well, I killed the coil.
Tried to get to the end of that oxidated spot, but while holding the coil in hand, i let it sl...morzh — 05:27 PM |
|
91H Code 126 Restore
|
| It does not require taking apart.
Find an opening, any gap that would lead inside, where the resistive element and the ...morzh — 04:59 PM |
|
Philco 70 antenna lead
|
| I agree. From the ones I've worked on its always been that green corrosion that causes the coils to open.Jim Dutridge — 04:34 PM |
|
91H Code 126 Restore
|
| Well I'm making good progress.
All the bakelite blocks have been recapped. I found that using a heat gun and skinny ...RealRider — 02:35 PM |
|
Who's Online
|
There are currently 3616 online users. [Complete List]
» 2 Member(s) | 3614 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
