Amperex PQ 6922 vs Amperex PQ 7308

There was also a military version of the 7308, no shield or PQ.

That said, if anyone is in need of some white or orange label Amperex 7308 PQ USA made I have a couple pairs I could part with. Also a single D-getter white label holland tube.

I've compared to a bunch of 6DJ8s (which are nice, and a lot more common), both are good but I'd rate the 7308 a fair bit higher.

-Ed

IMNSHO PQ=shield, it's the graphic that is on the tube. Sorry if I wasnt' clear. I have only had PQ with shield logo, not any that are either/or.

generally 7308s are quieter and better matched. they are selected 6922s, essentially.

the consumer versions pre-date the military versions in general. Age is by color of printing to a degree. white, orange, green for printing colors, oldest to newest. usually they have date codes on them too.

as with most tubes earlier=better.

-Ed

PQ = premium quality - it could just be a branding thing but then again it could be some extra selection for matched sections, etc. Likely impossible to say - much lore surrounding that sort of thing has been lost to the mists of time, alas.

-Ed