question on vox ac30 cc

[ACDCG400]

Hey guys ive been looking at a friends ac30 cc and it keeps blowing the power tube grid stoppers, the 1.5k ones. they start smoking then the ht fuse blows. any thoughts? i thought it might be dead tubes so i replaced them with good ones, but nothing. is it the ot?

[Raybob]

What are the voltages at power tube pins with no power tubes in?

[phsyconoodler]

There is a short somewhere,maybe the tube socket itself.I can't think of anything else that could cause a low voltage grid resistor to burn up.Are you sure they are grid resistors that you are talking about?

[ACDCG400]

Raybob, ill check in like 10 minutes, i didnt even think of checking! and im certain, its the resistor on pin 2 of every el84. thats odd tho, a short with every socket? 

[LooseChange]

Does it happen with the tubes removed?

[ACDCG400]

Sorry for the really late reply guys! It doesn't do it with the tubes out, but I replaced the it and still they are smoking. I'm gonna fiddle around with it more but do u guys have any other ideas? Ill check the cathode bias and make sure its working

[PRR]

>> What are the voltages at power tube pins with no power tubes in?

> ill check in like 10 minutes

Checked yet?

There's way too many things can go wrong, we (and you) need to buy more clues.