Author Topic: What tubes do you hoard?  (Read 1302 times)

choppinrice

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Re: What tubes do you hoard?
« Reply #30 on: May 28, 2018, 03:34:42 PM »
Need some help with tube tester repair. It had a burnt resistor and showed all tubes as shorted. Replaced all the resistors and caps per parts sheet included with unit. Lots of the old stuff was out of spec.

Started the calibration.
Step 1  adjusted great
Step 2 not so hot. cannot adjust to -2.5vdc, can only hit -2.7vdc on terminal 5.
leaving terminal 6 at -7.8vdc should be -7.5vdc. The BIG issue is terminal 7 should read -13vdc and it reads -17.8vdc.

Where is the extra  -4vdc coming from ?
Resistors and caps are good quality and right on spec.
My unit does not have the balance control.