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Additional Preamp Tubes

I am looking to purchase an additional matched pair of NOS tubes for my PS Audio BHK preamp. I currently own Brimar CV4003, Telefunken Medicals & Siemens Nickel Plate. 
When I began building my system 3.5 years ago, I wanted revealing - accurate. Now I want a tube that is more musical / warm, similar to the Brimar’s with a touch more warmth. 
My system: Aurender N150 > Briscati M3 > BHK > Moon 760A > KEF Reference 3’s. Rega P8 / Hana ML > Gold Note PH 10 on analog. Cables are Kimber Select from sources & Transparent Ultra’s pre > amp > speakers.  
ChatGPT recommended Mullard CV4003. There is a pair on eBay from Valve Tubes. Please let me know your thoughts on this and other potential tubes, and if you have any experience with Valve tubes. Thanks!

signaforce
bbroussard
206 posts
 

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.

buellrider97's avatar
buellrider97
1,002 posts
 

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. 

markmuse
337 posts
 

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.

thecarpathian's avatar
thecarpathian
6,236 posts
 

@buellrider97 ,

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

Man, what a score...

buellrider97's avatar
buellrider97
1,002 posts
 

@thecarpathian , Ha Ha , I should have bought Microsoft when it first was available. The guy had 10 of those tubes at $125 each , bought 4 should have bought them all. It’s sad what’s happened to nos tubes in the last 10 years. 

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