LOL, I think you mean "wiper", not "viper"!? A viper is a kind of poisonous snake!? Such is the confused but fascinating mess that is the English language.? ?Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone
toggle quoted message
Show quoted text
-------- Original message --------From: "adesilva_1999 via groups.io" <adesilva_1999@...> Date: 1/1/21 1:30 AM (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] Grid Bias Adjustment on 475A Happy new year guys!C 1374 is a possible culprit. You can always replace it and give it a try. If not, you could solder a couple of leads to the viper and the 50 volt ends of the pot and bring them away from the HV area to test. Since one end of the pot is grounded, you should be able to easily check the other end for 50 volts. If that is OK, then see if the viper has a voltage that is somewhere in between 0-50 volts. The issue is that it might be close to one end and the best test is to observe that lead while the power is on and turning it slightly with a plastic screw driver. If you decide to do that, make sure to mark the initial position as it is.
