I'm looking for a durable 811A for a Steve Bench A2 amp build: http://diyaudioprojects.com/mirror/members.aol.com/sbench/a2part3.html
Since the SV572-160 seems to have reliability problems and 811a is equivalent (+ top cap), I'm steered towards NOS G811 (Ryazan or Rzep plants?).
I'm surprised to find tubes with a getter flash and others without, sometimes even in the same auction:
What's the deal and which ones should I get for a solid vacuum when not using them cherry red?
Cheers
Simon
Since the SV572-160 seems to have reliability problems and 811a is equivalent (+ top cap), I'm steered towards NOS G811 (Ryazan or Rzep plants?).
I'm surprised to find tubes with a getter flash and others without, sometimes even in the same auction:
What's the deal and which ones should I get for a solid vacuum when not using them cherry red?
Cheers
Simon
There will be a complete vacuum in either of them but I would choose the getter oxide coated glass because it proves there is no gas in it.
The other is probably perfectly servicable.
The other is probably perfectly servicable.
Thanks Electronic, that makes sense. You consider them as equal, but one with a mine canary asset. Are you implying that the lack of getter oxide in some versions (i.e. sv572) isn't the culprit of the alleged longevity (gas) problem? Just curious, as I still am about why it's there in some otherwise identical tubes and not in others.