Making a socket 8 for my CR-70?

[miniman82]

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.

[Notimetolooz]

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.

[miniman82]

You might be right, I wish I could find a schematic for this thing to confirm.

[kvflyer]

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...

[marty59]

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.

[miniman82]

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.