Old tubes

Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

Old tubes

TA Forbes
Deviate Emeritus

Posts: 2,353
Threads: 92
Joined: May 2010
City: Clayton, NC

06-13-2014, 01:22 PM

TUBE REJUVINATION.doc Size: 78.5 KB Downloads: 205

Here is one method of tube rejuvenation. This is mainly for triodes with a thoriated filament.

Early tubes that do not respond well to this method of rejuvenation: 11, 12, 00, 26, 27, 45, 50, 80, 81, 71A

Another method is to "flash" HV across the tube filament. While I am not exactly sure how this works, I have a Knight tube tester that has been converted into this kind of rejuvenator. With it I have had success bringing back many varieties of tubes, including 75s (triode section), 78s, 80s, 45s, 6A3s, and 6L6s. FYI the 6A3 went from 1300uMho to 4600uMho, as measured on my Weston 981-3.

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

Old tubes - by fields 100 - 06-13-2014, 06:06 AM

RE: Old tubes - by Eliot Ness - 06-13-2014, 09:04 AM

RE: Old tubes - by fields 100 - 06-13-2014, 09:47 AM

RE: Old tubes - by TA Forbes - 06-13-2014, 01:22 PM

RE: Old tubes - by Randy H. - 06-13-2014, 03:29 PM

RE: Old tubes - by fields 100 - 06-13-2014, 06:18 PM

RE: Old tubes - by Arran - 06-14-2014, 03:32 AM

RE: Old tubes - by Randy H. - 06-16-2014, 05:08 PM

RE: Old tubes - by Phlogiston - 06-16-2014, 07:42 PM

RE: Old tubes - by Phlogiston - 06-16-2014, 08:20 PM

RE: Old tubes - by fields 100 - 06-16-2014, 08:44 PM

RE: Old tubes - by Eliot Ness - 06-17-2014, 07:35 AM

RE: Old tubes - by codefox1 - 06-18-2014, 03:34 PM

RE: Old tubes - by Phlogiston - 06-18-2014, 03:40 PM

RE: Old tubes - by Tom Hamilton - 07-12-2014, 04:22 PM

View a Printable Version

Users browsing this thread: 1 Guest(s)

Recent Posts
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. S...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM
Philco Model 38-7: what caps & resistors do fail typically?
Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM
Philco 42-345 Restoration/Repair
The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM
Philco 42-345 Restoration/Repair
What does the resistor measure? I think it should be 3.3 Meg. If the oscillator coil has continuity and the resistanc...RodB — 09:03 PM

Who's Online

There are currently 1343 online users. [Complete List]
» 1 Member(s) | 1342 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me