Quote:
Originally Posted by Polaraligned
Do you have any other CRTs you can test with the CR70 ?
I just tested 2 - 10BP4's and on one the cutoff set would not budge the needle. The other I was able to set the needle in range with great difficulty. The needle wanted to jump higher or lower. Both of these test good on my Super Mack. Pulling a set with a known good tube is a little difficult at this time as my back is acting up and I don't want to move my 8TS30
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If the cutoff set will not budge, try dropping the cutoff bias range switch in the lower right. If you are seeing the same jumpy behavior with other CRTs, I'd suspect your CR70 isn't working properly.
Maybe try hooking up a voltmeter between G1 and ground while you change the cutoff control and see if it's changing smoothly or jumping around.