Additional Preamp Tubes

buellrider97,

8/62 seems pretty late for a triple mica blackplate tube.   I think both GE and RCA phased this design out around 1958 or 1959.  It might have been stored without printing or possibly re-printed at the time.  Regardless, it is a very good tube, although not in the same class of some of the others mentioned above, IMHO.  Just for the record, my opinion doesn’t count.  Plug them in and see how YOU like them.  Best of luck.

@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.