Bad JJ valves

[Dmoney]

anyone else had problem?

I got an EL34 quad from a guy in south west london. brand new. dude works as a tech.
1 was arcing internally
had two spares. 1 of those was arcing internally.
got some new 6L6GC's last week
1 of those was arcing internally.

is it just me?
I use that online bias calc (http://www.ax84.com/contrib/biascalc.php) or the weber one and bias my valves using a bias rite to the colder side of 70%.

the 6L6's went in the deca with 500V on the plate, but that amp is built around 6L6's.


anyone else having issues with JJ's?
my 6L6's came from watford valves.

[Denim n Leather]

JJ EL34s are among the most reliable current production valves; they are also the closest thing to a current production Mullard.

I have JJs in all 3 of my amps now and they all behave flawlessly. I would think it's either law of averages or a less-than-reputable source.

[Dmoney]

they are from two different sources.
one being watford valves.
which I guess is the main place to get valves from in the UK other than Hotrox.

[Twinfan]

Just bad luck by the sound of it.