Pinnacle Vacuum Tubes??

Originally Posted by InnerSpace 

IIRC Pinnacle was a kind of European broker or re-boxer operation back when a tube was just a tube ... they would pick up big stocks of tubes from random European and Russian manufacturers, sometimes from military surplus, relabel them "Pinnacle", and then sell them into the trade via mom-and-pop stores.  So they're a bit of a crapshoot ... some were excellent items, some weren't, depending on the source and the batch received.

Wow, that's interesting.  It's quite strange that there is no way to determine their source.  I left a message for Jack and Woo Audio asking about these tubes which he provided, but a little surprised that he would choose these if the source cannot be verified, although I suppose he could listen to each pair to judge for himself, but don't know if he does this.

I tried searching the internet on Pinnacle Vacuum Tubes, but absolutely nothing relevant came up, which is also odd.

Thanks for the info.

Originally Posted by InnerSpace 

^^ I didn't mean to worry you.  It's possible - easy, even - for an expert like Jack to determine the identity of the tube visually.  He's probably passing on only the good stuff.  Which is great - the best NOS bargains are always the premium-but-rebranded items.

Ah, no worries!  Just curious.  The power tube upgrade was not expensive, but trying to understand where these tubes fit in the performance scheme of things, and whether it would be worth exploring other NOS options.