Shorted During Voltage Checks [Solved]

[Paul Birkeland]

Oops, I'm mixing up threads a bit with that one.

In any event, I would test with another tube to see if T5 drops.

[ssenesy]

Well, tube rolling was on my to-do list, so I guess I'll get some on order now.  Makes sense to have some backups, just in case   

Out of curiosity, what brand of tubes typically come in the Crack?  There was a piece of masking tape on the 12AU7, but nothing legible and no printing on the glass.

Thanks again!

Stan

[Paul Birkeland]

Out of curiosity, what brand of tubes typically come in the Crack? 

Usually RCA, GE, or Sylvania, with an odd sprinkling of others here and there.

[ssenesy]

Thanks Paul.

I ordered a RCA cleartop 12AU7A, a Mullard ECC82, and a Svetlana Winged C 6AS7G.  Should help for troubleshooting at least 

[ssenesy]

The new tubes came in the mail Monday, and I've been anxiously awaiting the opportunity to try them.  I finally got some free time tonight and swapped in the RCA clear top 12UA7 and removed the jumper that I'd put in from A3 to A8.

As soon as I powered up to do the voltage checks, I knew something was different.  The heater on the 12AU7 was much stronger than before.  All voltages checks were good.  I tested the tip voltage and that stayed at zero.  So, hook up the DAC and listen to some tunes!

I'm now happily enjoying some Van Morrison and wondering how long it'll take me to go through and re-listen to my entire collection.  The clarity is amazing and the background is absolutely black (without the Speedball).  I've got the Speedball built, and will probably swap it in after a week or two.

Mark this one solved!  Thanks Paul.