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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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4th Apr 2019, 6:35 pm | #1 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Radar 202 crt rejuvenator
I about to start rejuvenating a Radar type 202 rejuvenator. Unfortunately I can't find a circuit diagram.
There's a biggish, broken, neon lamp soldered inside an octal valve base. Does anybody know what I could replace it with? The heater current potentiometer has at some time in the past been replaced. Can anybody tell me if 10R is the correct value? The connector to the crt base is a metal cube with various types of socket. Mine has been messed about with and newer types have been fitted. Can anyone tell me what sockets were originally fitted. Thanks David
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4th Apr 2019, 6:50 pm | #2 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,987
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Re: Radar 202 crt rejuvenator
I have one of these and have used it to test CRT`s on most of my restorations, it has even brought back several mazda crm tubes that had no emission at all.
If you don't get your answer from someone else, I can take mine apart to measure the pot you need the resistance of. The Striker as far as I know can be replaced with one from a fluorescent light starter but you may have to search out the older style and even different values. The test sockets are Mazda octal, octal, B12, B8G loctal
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Stephen _________"It`s only an old telly" ___ Last edited by Freya; 4th Apr 2019 at 6:56 pm. |
4th Apr 2019, 8:18 pm | #3 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Radar 202 crt rejuvenator
Some info here, but no circuit: https://vintage-radio.net/forum/showthread.php?t=132530
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5th Apr 2019, 8:15 am | #4 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,987
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Re: Radar 202 crt rejuvenator
Heater control measures 7.5 ohms,
Included a picture of the "RE-Activator" in mine
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Stephen _________"It`s only an old telly" ___ Last edited by Freya; 5th Apr 2019 at 8:32 am. |
5th Apr 2019, 3:27 pm | #5 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: Radar 202 crt rejuvenator
Thanks for the replies.
10 ohms is close enough to 7.5 so I'll leave it, as long as wire wound isn't important because my replacement has a carbon track. Then again what's the worse that can happen apart from premature failure. My striker looks different to the one in the photo and other photos I've found online but again it probably doesn't matter. I did originally think it was a neon so there's a chance it still works, if not I'll use one from a florescent tube starter. I wonder why they went to the expense of using a valve base and socket to mount two resistors and a striker? Regards David
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5th Apr 2019, 9:21 pm | #6 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
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Re: Radar 202 crt rejuvenator
Under "CRT testers, or maybe Video circuits. I have posted a number of circuits there (NOT this one) but they should give some idea of using a florrie starter in the reactivate stage. I may have posted my own design, which came about from using the parts of an old Radar tester.
You DO want a wire wound pot for the heater, they easily burn out with up to 1A being resistively controlled. Les. |
20th Jun 2019, 10:12 am | #7 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: Radar 202 crt rejuvenator
A previous own had tried to modify it to test the three guns of a colour tube. I've snipped out what I think were the modifications and I'm now left with what I think are the original wires, connected to the octal socket (unless they've been moved ). Can anybody check this against their tester?
Pin 1 - white Pin 2 - black Pin 3 - N/C Pin 4 - N/C Pin 5 - green Pin 6 - blue Pin 7 - red Pin 8 - N/C The octal plug on the lead only has two N/C's and suggests that a connection should be on pin 4 but I have a feeling the connections in this plug have been fiddled with as well! Actually this connection lead is a disaster as well (see photos) but I'll deal with that later . TIA David
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20th Jun 2019, 10:39 am | #8 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
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Re: Radar 202 crt rejuvenator
This may helpful
Pin 1 = Heater Pin 2 = Heater Pin 3 = n/c Pin 4 = Cathode + A2 - this is on pentode tubes with the B12A base, connection is also made to pin 6 (marked i.c. in some books) Pin 5 = Grid Pin 6 = A3 - on the Radar this is a flying lead designed to connect to the final anode of the tube, and is a special 3-in-1 connector. Pin 7 = A1 Pin 8 = n/c
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Stephen _________"It`s only an old telly" ___ |
20th Jun 2019, 10:59 am | #9 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
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Re: Radar 202 crt rejuvenator
Thanks Stephen.
Unfortunately it proves I do have a missing connection to pin 4 and I cannot find any evidence where it might have been. Even though the other pins are connected I can't be sure they're in the correct positions. I think my only hope is someone will come forward with a circuit diagram . Regards David
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20th Jun 2019, 11:07 am | #10 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
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Re: Radar 202 crt rejuvenator
I can take some pictures of mine it would help.
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Stephen _________"It`s only an old telly" ___ |
20th Jun 2019, 11:22 am | #11 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
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Re: Radar 202 crt rejuvenator
Thanks, that might be helpful but please don't inconvenience yourself in any way.
Regards David
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20th Jun 2019, 1:06 pm | #12 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
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Re: Radar 202 crt rejuvenator
Just ready to strip mine and look,but mine is model number TT.
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8th Aug 2019, 9:36 am | #13 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: Radar 202 crt rejuvenator
I think I may have found where the missing wire should go. If anybody with one of these is willing and able to open theirs up I'd be very grateful indeed.
Please look at the attached photos. I've circled a tag on the re-activation switch. Should there be a wire from this tag to pin 4 on the IO socket on the front panel? I've carefully checked and cannot find any other disturbances to the original soldering, apart from the ones on the IO socket. Can anyone confirm the following connections are correct? Pin 1 - white Pin 2 - black Pin 3 - N/C Pin 4 - ? Pin 5 - green Pin 6 - blue Pin 7 - red Pin 8 - N/C Thanks David
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14th Aug 2019, 7:36 pm | #14 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
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Re: Radar 202 crt rejuvenator
Play spot the difference, you're right about the grey wire though.
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Stephen _________"It`s only an old telly" ___ |
14th Aug 2019, 8:05 pm | #15 |
Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
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Re: Radar 202 crt rejuvenator
Thanks Stephen, With your help I'm now sure I will have a fully working CRT tester.
Best Regards David
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