A little technical question about VH4 tube fault indicators

[nbarts]

The light for one of the tubes is on, but the tube is glowing like the rest of the tubes. Is this normal?

 

[Duolos]

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.

 

[nbarts]

Is the amp sounding normal?

Yep.

 

[nbarts]

So what tubes are recommended by Diezel now?

 

[Simop]

So what tubes are recommended by Diezel now?

SED 6550's.

 

[battery198]

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?

 

[Ailean]

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.

 

[battery198]

Turns out it was a bad fuse, replaced it and the light went away.

 

[nbarts]

Turns out it was a bad fuse, replaced it and the light went away.

Fuses go bad for a reason.

 

[duesentrieb]

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 . . . ).

 

[battery198]

Yeah,

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

I'll keep an eye on it.

 

[eonblue]

So does this mean that a tube fault fuse blowing doesnt necessarily mean a bad tube?

 

[nbarts]

So does this mean that a tube fault fuse blowing doesnt necessarily mean a bad tube?

Yea, but more often than not it is.