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Old 03-04-2017, 03:40 PM
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VA561 VA561 is offline
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Join Date: Apr 2010
Location: norfolk,virginia
Posts: 210
High Voltage problem

This thread relates to the previous vertical centering thread. A'64 zenith console, chassis 25LC20QS. The hv should be 25K. With the brightness all the way down, I am getting 16K at the crt anode. When I turn the brightness up to a normal viewing level it drops down to 12K. The voltage regulator is a 6BK4 and the h.v. rectifier is a 3AT2. I am not able to check either tube on my tube tester. The hv adjustment on the back of the chassis is turned up as far as it will go. I currently have about a 1/2" gap at the bottom of the screen. When the brightness control is turned up to a certain point, the picture gets out of focus. Advice needed as to what steps need to be taken and in what order. Thanks in advance.
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