What's wrong with my Valve Jr.?

[davelowell]

When I play guitar it's ok.  But, when I play bass or bassvi, it gets this click, click sound.  It seems to be mostly on the low notes.  I tried taking the head off the cab ( the cab is ok, a ported bass 1x10) no luck.  This only happens with the lower register instruments.  I did do some mods, standby, high gain, bright switch.  Would bad solder joints be a possibility?  I really don't want to take it in, it's such a low priced thing right now, taking it in might double the amps cost from my pocket. 

Any ideas?  Thanks, Dave.

[pullover]

Maybe a cold solder joint? Try reflowing all the solder joints where you modded it.

[eggwheat]

??sure the speakers not flapping due to the low Hz? Or the gain of  the pickups/ low hz of the bass isnt just distorting the input?

[davelowell]

??sure the speakers not flapping due to the low Hz? Or the gain of  the pickups/ low hz of the bass isnt just distorting the input?

no, it's a tuned and ported cab with an eminence basslite speaker.  the cab can handle it nicely, i'm sure.  it's something else.

[davelowell]

I decided to fix whatever the problem may be, even if taking it to a shop was necessary.  When I did the mods I also changed the tubes to new JJ's.  But, I made a rare good decision first.  I changed out the preamp tube first, and viola!  I can't believe it!  The problem was the preamp tube.  I put in a vintage Magnavox I had sitting around from when I swapped out all of my SVT pre tubes.  So, there it is.  Sounds great.  I just hope that the tube in the pre doesn't get damaged after a while, maybe that's what happened to the JJ?  Fingers crossed, I don't know.