Buzz/jingle in left channel. goes away when tilted

[keithpgdrb]

Thanks Adam,

yes, speedball is on my list.  I just wanted to make sure everything is working as it should before I add more variables.  I am probably more sensitive to the noises because I generally listen at pretty low volumes.

as far as tubes, I'll be reading the tube rolling thread extensively.  I'll make special note of those you mentioned.

 

[adamct]

I definitely applaud the idea of getting the stock Crack nailed down before moving on to any changes. And as you said, your tube might clear up after you let it cook a while. You can also rub the tube pins with a little steel wool or sandpaper, or apply some DeOxit, in case the pins are slightly corroded/oxidized.

 

[Grainger49]

Ok, if you have a grounding problem you should use a good meter and check all the resistances to ground.  Clip one meter lead to the chassis plate.  The other meter lead goes to the terminals or pins called out.  Check every point as called out.

If you have painted both sides or powder coated it, you must scratch off to get to metal to clip on.

This is a post I have made before:

The start of the grounding points is terminal 3.  This jumps to the 2 left lugs of the volume pot and back from there to the RCA jacks.  From the top left lug of the volume pot there is a grounding jumper to the two bottom lugs of the headphone jack.  This jack may be different than what is being delivered today.

Also from terminal 3 you go to the center lug of the 9 pin tube socket.  This is the ground route for the LEDs in the cathode circuits.

The power supply ground comes from those bottom headphone jack terminals to terminal 12.  From there it jumps to terminal 14 and ends at terminal 20.

The heater (AC) supply is a ground wire from transformer terminal 4 to terminal 22.

You should read zero to T3, Volume 2 left lugs, both RCA outer conductors, headphone jack bottom terminals, T12, T14, T20, center pin of the 9 pin socket, and to T22.

Other grounds that should be solid are pin 8 of the large tube, pin 4 and 5 of the small tube, T8, T11, T14, T16, T17, T20, T21 & T22.