#1
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Making a socket 8 for my CR-70?
This came up once or twice in the past, but I cannot locate the post. My CR-70 didn't come with a socket 8 for testing 70* color roundies, so I'm hacking up an old brightener to make one. Going off the knob settings for a 21AXP22, I found heater voltage on pins 4 and 10 of the cord coming out of the unit. But the others I'm lost on, can someone please direct me to where the other connections must be made? I believe I only need the G1 and cathode connections in order to test a CRT, right?
Reason: I hate the universal adapter, and being able to do color tracking tests would be nice.
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#2
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I don't have a CR-70 but I think you need G2. My CRT tester uses G2 as the Plate. G1 bias is used for the Cutoff test.
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#3
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You might be right, I wish I could find a schematic for this thing to confirm.
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#4
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I thought I had a schematic of the CR70. But what I had was only a partial. Maybe someone else can help. I hope so...
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#5
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I took a little different approach and made an adaptor from a 90 Degree color brightner using it's male end to a female 70 degree socket. Even though some of the pins are different you can verify the connections as well as matching up the color coding of the wiring.
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Audiokarma |
#6
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Figured it out, here's the connections in case you find yourself in the same situation.
CR-70 knob position----------Output Terminal on test cable F1=1, F2=14 (heater)----------------------4/10 Red Gun K=4----------------------------------------14 G1=2---------------------------------------12 G2=13--------------------------------------13 Green Gun K=5-----------------------------------------5 G1=6----------------------------------------6 G2=7----------------------------------------7 Blue Gun K=13----------------------------------------9 G1=12---------------------------------------8 G2=11---------------------------------------3 Thus the following connections must be made, between the CR-70 and CRT socket: CR-70 Cable-----------------CRT Socket 4/10----------------------------1/14 14-------------------------------4 12-------------------------------2 13-------------------------------3 5--------------------------------5 6--------------------------------6 7--------------------------------7 9--------------------------------13 8--------------------------------12 3--------------------------------11 I hacked the socket #7 that came with the unit to install a roundie female socket, looks like factory and works like a champ.
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