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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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Old 4th Apr 2019, 6:35 pm   #1
Radio_Dave
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Default 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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Old 4th Apr 2019, 6:50 pm   #2
Freya
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Default 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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Old 4th Apr 2019, 8:18 pm   #3
AC/HL
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Default Re: Radar 202 crt rejuvenator

Some info here, but no circuit: https://vintage-radio.net/forum/showthread.php?t=132530
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Old 5th Apr 2019, 8:15 am   #4
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Default Re: Radar 202 crt rejuvenator

Heater control measures 7.5 ohms,

Included a picture of the "RE-Activator" in mine
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Old 5th Apr 2019, 3:27 pm   #5
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Default 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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Old 5th Apr 2019, 9:21 pm   #6
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Default 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.
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Old 20th Jun 2019, 10:12 am   #7
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Default 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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Old 20th Jun 2019, 10:39 am   #8
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Default 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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Old 20th Jun 2019, 10:59 am   #9
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Default 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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Old 20th Jun 2019, 11:07 am   #10
Freya
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Default Re: Radar 202 crt rejuvenator

I can take some pictures of mine it would help.
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Old 20th Jun 2019, 11:22 am   #11
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Default 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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Old 20th Jun 2019, 1:06 pm   #12
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Default Re: Radar 202 crt rejuvenator

Just ready to strip mine and look,but mine is model number TT.
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Old 8th Aug 2019, 9:36 am   #13
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Default 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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Old 14th Aug 2019, 7:36 pm   #14
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Default Re: Radar 202 crt rejuvenator

Play spot the difference, you're right about the grey wire though.
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Old 14th Aug 2019, 8:05 pm   #15
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Default 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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