01-25-2021, 11:32 AM
I haven't turned this on for a while but recently when I did I discovered that when I perform the line test the meter pegs right. I Looked over the schematic and I am not seeing the reason for the issue. Regardless of line switch position the meter past off the meter is pegged. I have checked all resistors and all check ok with the exception of r107 which measures at ~45 ohms. Since r107 sits across the meter I disconnected the meter and I get ~270 ohms. High but not open. The meter measures 50 ohms. I decide to put a decade box in series with the meter and at about 500 ohms on the decade box the line test is able to be centered and the each of the positions of the line switch vary the meters response as expected. While that works I am not sure what the failure mode is or the effect the additional resistance would have on tube testing results.
Andy
Andy