A little technical question about VH4 tube fault indicators

  • Thread starter Thread starter nbarts
  • Start date Start date
nbarts

nbarts

New member
The light for one of the tubes is on, but the tube is glowing like the rest of the tubes. Is this normal?
 
I had this happen to me on my VH4 once. Is the amp sounding normal? My tube ended up going bad. I just replaced the tube and fuse to be safe and I was fine.
 
This just happened to me too in position #1, but the tube is still glowing. Is the tube bad for sure? Also, can I just place a new tube in, or do I have to have them all replaced and rebiased?
 
You can replace just the single tube, but it's normally wiser to replace a pair so that they are balanced, and often people will replace the quad if the tubes have been used for a while, again so that they are in balance with each other.

Largely depends on the age of the tubes.
 
Turns out it was a bad fuse, replaced it and the light went away.
 
The fuse isn't in the heater circuitry, but on the plate - so they still glow but don't produce any output (mismatch of your transfomer). Replace fuse, test again, if you have another fuse blown, replace tube (single, pair or all of them - the VH4 has just one bias pot, so either you find a matching or . . . ).
 
Yeah,

Once I replaced the fuse, I haven't seen the light come on again.

I'll keep an eye on it.
 
So does this mean that a tube fault fuse blowing doesnt necessarily mean a bad tube?
 
eonblue":kwx7ugti said:
So does this mean that a tube fault fuse blowing doesnt necessarily mean a bad tube?
Click to expand...

Yea, but more often than not it is.
 
You must log in or register to reply here.
Back
Top