Posts: 189
Threads: 22
Joined: Aug 2018
City: Kewanee
State, Province, Country: Illinois
Hi guys, I have an Eico 324 that I bought off of Ebay a few months ago. It had been recapped (mostly) and a few resistors changed. Anyway I recently got a counter hooked up to it and found that on all frequencys it was a dead at the same point about 430KC and after, like the tuning cap has a short or something. Anyway, I went ahead and changed the remaining caps and resistors that the other guy didn't, tested the tubes and removed the silicon rectifier and replaced it with a 1N4007 diode resistor and new electrolytic caps. Today I started setting the alignment and it is pretty dang close, but I still have a dead spot on all frequencies and then it comes back. On B setting it is dead between 430K - 600KC and then it comes back and it pretty dang close on the counter. It is the same spot on all knob positions. Any ideas as to what is causing the dead spot? I see no contact on the plates of the tuner cap. Does anyone have any ideas?
Terry if you remember when I was using this when you helping set the 60L I was experiencing the drop out.
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: 7
Threads: 2
Joined: Jul 2017
City: Myersville MD
You might try using an ohmmeter and measure the resistance of the tuning cap (should be open always) and see if it shorts at those knob locations in questions.
With out power of course.......
Posts: 16,188
Threads: 562
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
>>>>removed the silicon rectifier and replaced it with a 1N4007 diode resistor
Didn't quite get this.
That is I think I know what you meant by that, but .....
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
Hey morzh, I left a few words out, sorry about that. I used the 1N4007 diode and a 2.4K resistor and two .22 electrolytic caps to replace the selenium rectifier. (I also said silicon rectifier). Duh!
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: 704
Threads: 8
Joined: Apr 2018
City: S. Dartmouth
State, Province, Country: MA
The contact of the rotor wiper on the tuning cap may have a spot of corrosion where it sat for years. Using a blade of stiff but very fine sandpaper, slip the paper under the contact blade with the paper side facing the blade. Gently pull the sand paper through. Do that to both blades at the point of the "flat-spot"
YMMV
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
(This post was last modified: 01-11-2019, 09:39 PM by Chas.)
Posts: 16,188
Threads: 562
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
It actually needs 2.4K resistor to compensate or is it the combined new value?
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
Hi morzh, I used a 2.2k 1% resistor with the 1N4007 diode. I didn't have a 2.4k. My choices were 2.2k or 2.7k. I was replicating a selenium rectifier replacement a guy sells on Ebay for the 324. I figured I had the parts, so why buy his when I can make my own.
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?)
Might not be dead at that spot - might be noisy. The counter I installed won't lock if the signal is too low, too high (level) or if modulation/noise is above about 20% (mod turned on and about 1/4 turn). On the higher freq settings the unit uses harmonics that can be accompanied by noise and birdies (missing bird imogi)  .
"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
Ok I got it fixed, yay! It was a slightly bent plate/fin on the variable capacitor. It was a definite dead spot, as my capacitor tester would drop out when I hit the spot and would stay dead until I hit a good spot again.
I had looked at it really closely as best I could with it still installed, but couldn't see any defect. I completely removed it and on my bench got the same result when testing it. Using my large magnifying lens and light, i finally saw one fin on the bottom side that was just slightly bent and touching the one next to it. I carefully straightened it and bench tested it and SUCCESS!
I reassembled everything and got it all aligned using the counter. It is now working great on all ranges.
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: 1 Guest(s)
|
|
Recent Posts
|
|
The list of my radio & TV collection!
|
| Hello Peter,
Thank you for posting that !!
Sincerely Richardradiorich — 09:40 AM |
|
Eico 232 VTVM Schematic
|
| It's a microwave antenna. ?;-p?. I substituted 1N4002s off the 6.3 vac winding for the 1.5 volt battery. Uniprobe is the...RodB — 05:50 PM |
|
Eico 232 VTVM Schematic
|
| Try BAMA for a schematic.
Looks like a replacement power source for the D battery has been installed. The tube may be...Chas — 04:51 PM |
|
Eico 232 VTVM Schematic
|
| Is that a battery holder?morzh — 04:43 PM |
|
Eico 232 VTVM Schematic
|
| A friend gave me this Eico 232 VTVM and I'm having trouble locating the schematic for it. This one seems to be a later v...RodB — 04:17 PM |
|
Var resistor id
|
| Considering what it is in series with, I doubt there should be any power requirements. Of course, we should
know wher...morzh — 03:23 PM |
|
Var resistor id
|
| Trim pot, about 1/2 watt part of focus divider. As stated 2k ohms.
This appears to be a rusty chassis, resolder all ...Chas — 03:19 PM |
|
Var resistor id
|
| Its a Sylvania 400 oscilloscope. here is a clip of r-100. Would be nice to know the current required. Not listed in part...Martinj — 02:10 PM |
|
The list of my radio & TV collection!
|
| Thanks Richard. I hope you enjoy it.
Here I have created an English section on the history of radio with videos in Engl...RadioSvit — 10:23 AM |
|
The list of my radio & TV collection!
|
| Hello RadioSvit,
first all happy new year !
I will watch your new videos this week.
Sincerely Richardradiorich — 09:19 AM |
|
Who's Online
|
There are currently 9816 online users. [Complete List]
» 3 Member(s) | 9813 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
