Bottlehead Kits > Mainline
Mainline final volt test fail
Tbar:
So I have finished my Mainline 1.1 build but appear to have a final volt test issue. All resistance tests and the early volt test passed without issue. However, I am now getting wonky readings off the 6.3v pads. Initially I was getting 8v on the + and 1.4v on the -. I found a thread here with a similar issue that was resolved by clearing touching contacts on one of the socket pads; so I had a look those and found one spot where there could have possibly been cross contact (but not 100% clear there was - either way I adjusted it). When I put things back together my problem had reversed! Now I am getting upwards of 330v on the 6.3 pad. Resistance check and all other volt checks still pass. Pulled the tubes . . . same result.
Paul Birkeland:
Can you post some build photos?
You should see about 50V on one of those terminals and 56V or so on the other. If you are seeing 330V, then you may have your black meter probe in the wrong spot, there may be a missing ground wire, or some unusual soldering problem exists. Definitely don't attempt to use this amp until this is resolved.
Tbar:
I rechecked everything around the sockets, reinserted the tubes and now I am getting ~260v off both +/- of the 6.3v pads. They were dead on 6.3v at the page 52 test.
Paul Birkeland:
What do you measure on the power supply board where the black wire leaves (the - terminal)?
Tbar:
-275 reads 0.
-6.3 reads 263
Navigation
[0] Message Index
[#] Next page
Go to full version