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: 16,509
Threads: 572
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: 714
Threads: 9
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: 16,509
Threads: 572
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
|
|
Model 70 Cabinet Trim
|
| Hello musar,
First all welcome to the forum and yes that is true that steve stopped making trim .
Sincerely Richar...radiorich — 12:13 AM |
|
Model 70 Cabinet Trim
|
| I have recently come into possession of a Model 70. The trim around the base needs to be replaced. If this were years ...musar — 12:07 AM |
|
philcorepairbench.com - shadow-meter
|
| Anyone know of a way to recover these files from the repair bench? Thanks.
fenbach — 11:16 PM |
|
Philco model 38 code 121 not receiving signal.
|
| That's true. Of course If I were to get a vtvm I'd probably have to sink money in to it to get it working right. Probabl...Stormlord5500 — 08:44 PM |
|
Philco model 38 code 121 not receiving signal.
|
| A DMM is good enough.
One rarely has to measure indictance, but if you do, short of getting a serious LCR meter (I hav...morzh — 07:35 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| You guy's are right on. I found a broken wire on the speaker plug that I replaced and all is well now.
Have better volu...murf — 03:43 PM |
|
Philco model 38 code 121 not receiving signal.
|
| I need to get a vtvm. I think that little component tester is just more accurate. Plus it shows the inductance which is ...Stormlord5500 — 03:07 PM |
|
Philco model 38 code 121 not receiving signal.
|
| I use a pair of Mastercraft brand DMMs from Canadian Tire, from what I read most of those DMMs use the same main chip re...Arran — 02:36 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Thank you sir. Yes I feel good and also relieved because this one's been weighing on me a bit.Stormlord5500 — 11:18 AM |
|
Philco model 38 code 121 not receiving signal.
|
| It feels good don't it? Good luck on the rest.Paul Philco322 — 11:06 AM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
