Have had this television since I was 12 what model is it?
Posts: 1,002
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
No pic but have sound. Do you have high voltage? Ground a good, insulated screwdriver at the blade to the chassis with a long wire and carefully hold it near but not on the CRT Anode connection. Work with one hand; keep the other hand in your pocket. You should be able to draw an arc about 1/4 to 1/2 inch or more. If no HV, don't go rushing to buy a CRT. Look at the horizontal output tube (the fat one above the HV cage). If the plate is glowing red, SHUT DOWN fast. The Horizontal Output tube depends on a signal from the Horizontal Oscillator. If the coupling cap is shorted, The Horizontal Output tube will draw too much current and burn out, possibly taking the flyback along with it.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
I will definitely try that tonight. So just having the wire near the anode connection will draw an arc even with the rubber boot on it?? Thanks for the tip! As always its appreciated
Posts: 1,002
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Yes, it will, think of testing the spark on a lawn mower or car. Do remember to GROUND the screwdriver shaft to the Chassis! and use a screwdriver with a rubber handle and that the shaft does not extend out the back of the screwdriver. Don't directly touch the anode clip, but if the circuit is good, you should get a nice blue spark at between 1/4" and 1/2". If no spark, shut down and perform the same test at the plate cap of the HV Rectifier in the cage. Again, BE CAREFUL! Use the 1 hand in the pocket technique and ensure that the screwdriver is well grounded to the chassis.
Early Television Museum has a very short guide on working on TVs which may be helpful:
https://www.earlytelevision.org/restoration_advice.html
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
Gonna have to buy you a drink after all this help! I'll be safe. Fully understand about grounding (and not completing the ground through myself!) I'll be sure to let you know how this works out. Appreciate the link I will read this 1st.
Posts: 1,002
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Hi Brian,
I surely apologize for being repetitive about safety, it comes from my current position as a "Customer Technical Specialist" for the company that I worked for, for 40 years. Our calls are recorded and we fail our call quality if we do not give appropriate safety statements to our customers that are attempting a repair that we would otherwise have to visit the Customer to fix the issue ourselves.
The second reason is to protect myself and the Phorum as well as the person that I answer.
Good luck, let us know the outcome and don't give up.
Best Regards.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
You're a good guy. Thank you. Dont think for a second about being repetitive on safety. Im sure many oh "novice repair person" has arc'd themselves because of not knowing and I appreciate you looking out for everyone. Thanks again and not a chance im giving up on this ole girl.
Posts: 1,130
Threads: 79
Joined: Jan 2014
City: Annapolis, IL
In post 10 I recall you mentioning you had a wire break off the tube flush with the glass? If that's the case, the tube is toast. No way to put that back on and it wont work if the wire is broke off. You may not have wires out for each pin tho, only the pins that are used (the pins that have a wire coming from the socket to the chassis). Any others don't matter. I don't be a pessimist but with that brightener, I'm not holding out a lot of hope. You might get a picture, but if the tube is weak, you wont get a good bright sharp pix. However you may still be able to use it to troubleshoot the rest of the set before replacing the tube. Sometimes a tube will go "go to sleep", and wake up after it's run awhile. Is it glowing inside near the socket? If you could, shoot us a close up of the socket where it is broken so we can have a look.
If there's HV, as Mr. Fixit said, then there's hopes for the chassis. His advice to check works well if you don't a probe. You can also listen to see of the horizontal is running. Some people may not be able to hear it, but I can. Ditto on the output tube red plating, and the low voltage rectifier(s) red plating. Pull the power if you see that. It'll be a high piched sound, almost a whistle coming from the flyback/horizontal area. Also know 1B3 HV rectifiers are notorious for going to air - thus no HV. You should have in the 12-14kv range for proper HV.
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: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
Appreciate the follow up TV MAN. Yes I figured with the wire breaking off that the tube is toast and have posted on numerous sites and classifieds to hopefully find a NOS piece. I checked for high voltage last night as suggested by Mr FiXIT and yes I have a strong arc when brought near the anode connection. I guess patience needs to take over and hopefully as I continue to look ill find a replacement CRT. You all have been such a big help in working my way through this and cant thank you enough.
Posts: 1,130
Threads: 79
Joined: Jan 2014
City: Annapolis, IL
That's a very good sign, means your horizontal is working, good flyback, probably good yoke. Do you hear the vertical running? It'll produce a 60 cycle buzz in the yoke and output transformer. It could be off frequency so it might be faster or slower. You can turn the vertical hold control and listen for it to change speed. It it possible to get a close up of the connector on the tube itself showing the damage and possibly the broken wire? Is it lit up (yellowish orange) in the neck when on?
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: 1,957
Threads: 146
Joined: Jan 2013
City: Westland, MI
Brian, you might want to check out this site: https://www.earlytelevision.org Their inventory lists three 21EP4 CRT's available for sale - all used. It's a start! Take care and BE HEALTHY! Gary
"Don't pity the dead, pity the living, above all, those living without love."
Professor Albus Dumbledore
Gary - Westland Michigan
Posts: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
Awesome Gary going there now to see what I can get. Thanks for the tip!
Posts: 1,002
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Oops, sorry, Brian, I forgot to recommend the ETF Website to you, glad that Gary SP did!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 21
Threads: 1
Joined: Jan 2023
City: rocky point
State, Province, Country: NY
No worries whatsoever! I've contacted them and awaiting a response. Cannot wait to move ahead and see where this leads me. Excited to try and put life back into the old girl!
Posts: 1,002
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
While waiting for the CRT, connect the set to a VCR or the "RF" Output of your cable box to verify that you have audio. That will give you an idea as to whether your tuner, video and audio circuits work.
I expect that the CRT is not going to be cheap. in addition, it would have to be professionally packed, possibly "foamed" into a box and double boxed. In fact, you may have to drive 10 hours to central OH to get it.
I cannot stress more strongly the danger in handling one of these CRTs. Wear a face shield, eyeglasses, gloves and complete covering. Discharge the 2nd anode connection on the CRT to its outer "aquadag" covering. Have nothing in pockets that can fall out and strike the CRT. I had one break on me as a kid when it fell out of its mount on the set. There was glass everywhere. I was standing at the side of the set. If I was in front or of the set, I stood a good chance of being blinded, NO $#!^
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 1,130
Threads: 79
Joined: Jan 2014
City: Annapolis, IL
I'm glad you have a lead on a tube. They should know how to pack it. I've received several in good shape packed in cardboard & foam. Main thing it to protect the neck from being snapped and the front from scratches. Yes, do handle with care and discharge before you grab on, even ground it several times. They are like a capacitor and even tho the shock wont kill anyone it can startle you and cause you to drop the tube. Then the fun begins. I've discharged a tube several times and still get a little bit of a spark if I do it again, mostly on color tubes, which operate at a higher voltage. Do be careful! You want your eyes working properly so you can enjoy that 21" black & white picture!
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
Users browsing this thread: 3 Guest(s)
|
Recent Posts
|
Jackson 715 not working
|
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM |
HiFi (Chifi) tube amp build - but my own design.
|
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM |
Jackson 715 not working
|
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM |
Restoring Philco 37-604C
|
Yep. F5 is green, D5 is Red.
Red is Bad.
Green is Clean.morzh — 01:30 PM |
Jackson 715 not working
|
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM |
Restoring Philco 37-604C
|
(Insert Homer Simpson "DOPF" Here.)
When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM |
Philco 91 Speaker Replacement
|
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil.
It wo...morzh — 08:44 AM |
Philco 91 Speaker Replacement
|
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM |
Philco 91 Speaker Replacement
|
As Rod said, it is OK to use a fitting speaker, and then look for an original one.
If you buy a Hammond 125 output tr...morzh — 08:15 AM |
Philco 91 Speaker Replacement
|
Yes, I often have to substitute, then keep an eye out for an original. In the meantime, the radio is working and being e...RodB — 08:02 AM |
Who's Online
|
There are currently 4281 online users. [Complete List] » 1 Member(s) | 4280 Guest(s)
|
|
|
|