Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Not sure where this should go.. Please move if its not in the right place
Question about a 50L6 tube.. I have 5 tubes that all check bad for shorts.. Is this normal ? Does this tube have high leakage? I cannot seem to believe all the tubes are shorted.. Or is this a common problem...
Thanks
Skip..
Posts: 16,298
Threads: 567
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
I forgot but in one of Kirk's radios where I had a 42 tube in the output I had the 42 that had a filament short (and was working). I bought another one and it was shorted too. And then another (the short disappeared after a while....????) Eventually I got one that was not shorted.
I do not think it could be normal for a tube to show a short. Even if it works (which is quite possible depending on the arrangement).
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: 1,196
Threads: 83
Joined: Jan 2014
City: Annapolis, IL
State, Province, Country: USA
Maybe your tube tester? What tester(s) do you have? My Hickok did something weird like that on a 6SN7GT recently, even with the tube out of the socket... haven't gotten into it yet..
If I could find the place called "Somewhere", I could find "Anything" 
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
Posts: 16,298
Threads: 567
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Possible....though a similar suggestion was expressed to me back then and no, it was not the tester.
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: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Ok I used a Hickok 600A tester and a Heathkit IT-17.. All showed short on 5 tubes.. Doesn't seem right. But maybe all 5 are bad? I wouldn't think so But who knows..
Going to see if I have any 25L6 or similar to see what they read..
Skip..
Posts: 16,298
Threads: 567
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
I think all 5 are bad.
This said, you might be able to use some of them in some circuits. It depends on how they are powered.
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: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
Ok plugged one of the tubes into radio the Zenith 5D011. All is well plays good with load and clear volume... No excessive current draw 117 Volts at .25 amps...
Thanks
all for the help..
Skip...
Posts: 5,129
Threads: 271
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
I'm curious. If there is a short in the tube, does that mean that there is an unwanted connection between elements inside the tube? For example, between a grid and the plate. If so, shouldn't you be able to detect a short by putting your ohm meter across the various pin combinations? Or is there something else that can cause tube shorts?
Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale
State, Province, Country: PA
I tried that. The tube I am using I checked for shorts pin to pin Tube cold. No shorts.. But when put in Tester showed short I think between Cathode and Filament according to the chart with my Hickok 600A..
Tube works in radio No problems..
Skip...
Posts: 16,298
Threads: 567
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
The short is mostly between the filament and the cathode, and this could be benign in some arrangements. In some others you might have hum. If it works, you are fine.
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: 2,031
Threads: 367
Joined: Jun 2010
City: Dover, OH
It can be amazing how you sometimes find faulty tubes in groups. Usually that doesn't happen, so it can throw one off when it occurs and it can be easy to blame the tube checker. One reason why my friend always said to keep a couple testers around. I have had a similar issue with type 47 tubes lately. I've managed to get three radios with push-pull 47s now and in all three cases one 47 in each radio was burnt out or would burn out as I was testing it. Tapping the tubes lightly would cause an arc inside them, but nothing else. I actually watched one burn the filament out on my tester when I tested the tubes in my Philco 90X.
No matter where you go, there you are.
Posts: 670
Threads: 11
Joined: Sep 2014
City: Bellmawr, NJ
THAT is what ,,I was show,,was to flick your finger against the tube ,,in tester,,while pushing the test button,,for any kind of short,,be-side the short test,,,CHEERS
Posts: 1,238
Threads: 30
Joined: Jan 2014
City: Wellborn Florida
50l6, 50C5, 35W4, 35Z5, If working on a All American set (AC DC) that has a bad tube good chance one of the following. David
Posts: 4,413
Threads: 416
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
Outputs and rectifiers often are candidates to go, if they were pulls maybe they are all bad, really.
Paul
Tubetalk1
Posts: 462
Threads: 40
Joined: Jun 2010
City: Lehighton
State, Province, Country: PA
I have 7 50L6GT here and none test as a short.
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Philco model 60
|
| Yes, Mark belongs to the same Michigan Antique Radio Club that I do. I suspect that the oscillator coil is in need of a ...Radios1340 — 03:10 PM |
|
A Marconi model 86
|
| Yeah. I am dreading the thought of what to do with all my consoles when I will no longer be able to move them around.
I...morzh — 02:51 PM |
|
1947 Silvertone 7086 Wire Recorder/Phono/Radio on YouTube
|
| Cool gadget, Buzz.
I took me a couple of second to undestand that that oscillating thing makes the wire to spool correc...morzh — 02:50 PM |
|
A Marconi model 86
|
| My back hurts already, you could build a house with all the wood. PaulPaul Philco322 — 02:49 PM |
|
1947 Silvertone 7086 Wire Recorder/Phono/Radio on YouTube
|
| Part 4 of this series now uploaded
link below to anyone interested
Buzz — 02:39 PM |
|
Philco model 60
|
| Welcome to the Phorum, Radios1340! The oscillator coil on the 60 is a common culprit. I just bought a 60B (June 1934) ...GarySP — 02:33 PM |
|
Philco model 60
|
| Yes, standard alignment procedure. I can get the minuscule tone to vary when adjusting the trimmers. But you almost have...Radios1340 — 01:40 PM |
|
A Marconi model 86
|
| An imposing-looking radio, for sure.morzh — 12:43 PM |
|
Philco model 60
|
| Model 60 struck again :lol:
Welcome to the Phorum!
Above is the article on Model 60. Could be of some use.
Now...morzh — 12:38 PM |
|
A Marconi model 86
|
| Ooh, very nice!jrblasde — 12:19 PM |
|
Who's Online
|
There are currently 6702 online users. [Complete List]
» 2 Member(s) | 6700 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
