Heathkit AA151 Volume Control Issue

[EmperorNorton]

Hello guys,

Thought that tubes would be more fun and end up with more problems as I go.   I noticed some variation in right and left channel on my Heathkit.  Seemed like the Heresys should be cranking at 12 oclock.   All the connections are good.   Sprayed a little DeOxit in the volume pot but made no difference.  Any suggestions before I take it out to Don at Phils TV?  thanks in advance

[rgpit]

Swap the right and left channel tubes and see if the volume issue follows the tubes. BTW you should not use contact preservative on any tube pins or sockets.

[OldiesButGoodies]

Hello guys,

Thought that tubes would be more fun and end up with more problems as I go.   I noticed some variation in right and left channel on my Heathkit.  Seemed like the Heresys should be cranking at 12 oclock.   All the connections are good.   Sprayed a little DeOxit in the volume pot but made no difference.  Any suggestions before I take it out to Don at Phils TV?  thanks in advance

They can be more fun but can also be a pain,  as you can be witness to now.  For now I am using solid state,  where I know I will get roughly the same result every time.  Do I miss tubes?  Yes,  particularly in the preamp section.  So would not be surprised  if I end up with tubes again there.   

Try Ron's suggestion - see if you have a weak tube somewhere. 

Pepe

[MacGeek]

What is your source?  Channel imbalance issues can come from anywhere in the signal chain.  If the tube swap doesn't identify the problem, I suggest swapping every wire pair, a component at a time, including the speakers

[EmperorNorton]

I will swap out components and swap the tubes.  The volume seems balanced but low.  I can listen to the Heresys with the volume knob at 3 o'clock and it's not too loud.

[Sir Thrift-a-Lot]

I will swap out components and swap the tubes.  The volume seems balanced but low.  I can listen to the Heresys with the volume knob at 3 o'clock and it's not too loud.

Yeah, that's not right.   I can drive my Hereseys with the headphone jack of my DAC.   Did you give a good cleaning to the mode switch?  That could give all of the symptoms you have described.

[MacGeek]

Tape monitor switches are notorious for causing problems as well, in my experience.  It may take more than one  cleaning.