Additional Preamp Tubes

@bbroussard , I’m not an expert but they shipped in their original box’s. They are not rca logos but a light brown military JRC box with the production date below the other info. The tabs fell off the second time I opened them. I did try them then went on to 5-6 other pairs settling on  the black coated Tekefunkens. Regards , Mike B. @signaforce , Ha Ha , I still have the RP-1, I aquired a Rogue Hera and a pair of M-180’s that I had upgraded to Dark. Got ‘em done last fall and it’s all in the closet until I wall mount a yet to purchase TV, new rack built and a loom of balanced IC’s. Hopefully in the new couple months. Happy Hunting. 

It was not uncommon for the military to re-test and re-package tubes with then-current dates.  They are significantly better than actual 1962 production.

FWIW , RF Parts company in San Marcos, Ca has nos RCA 6189’s black plates for $34.91. Sorry I wasn’t able to post the link with my iPhone. 

Don't rule out 6V tubes. There is a jumper to change inside the chassis. When I had a BHK pre I liked 6 volt tubes best, though I don't remember which tubes in particular. But a problem I had with 6V in my unit was noise. But I think that was not universal.

@buellrider97 ,

Mike, that's right! You're the one with the legendary Telefunkens!

Man, what a score...