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: 16,306
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
|
|
The speaker table error?
|
|
G 10-1/2" 65, 76, 87, 95
Push-Pull 45's
2766
0.7
550
3200
H 10-1/2" 77, 96
Push-Pull...morzh — 09:26 PM |
|
A Marconi model 86
|
| I have a Stromberg, one of the early ones, seems early 30s.
This is what I call a back breaker. None of the early Philc...morzh — 08:28 PM |
|
A Marconi model 86
|
| A backbreaker.....PaulPaul Philco322 — 08:12 PM |
|
A Marconi model 86
|
| >>What a behemoth!
A Juggernaut.morzh — 07:47 PM |
|
Philco 70 antenna lead
|
| I am not sure I understood about the coils and the mush. I looked an more than one coil in 20, 70, 90, 60, Zeniths and ...morzh — 07:46 PM |
|
A Marconi model 86
|
| :e_biggrin: What a behemoth! I hope the final result is as much a quality sounding example! Keep us posted on your pro...GarySP — 07:32 PM |
|
A Marconi model 86
|
| I should add that the double conversion may only be used on the shortwave bands, but I haven't looked at the schematic t...Arran — 07:27 PM |
|
Philco 70 antenna lead
|
| Yes, that wire will not pick up much interference as routed - the RF at that level won't be affected, and if you have st...radio1 — 07:26 PM |
|
Philco model 60
|
| I'm also a member of MARC. Did you attend the Vintage Electronics Expo in Waterford, MI last month? That's where I got...GarySP — 07:22 PM |
|
A Marconi model 86
|
| Dan
Double conversion is using two IF converters instead of one. This improves the image response.
morzh — 07:15 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
