This tubes according for Audio Research
REF 5, REF 3 series, CD8 player, REF2 phonostage
5 x superb matched 6H30 PI / 6H30 DR and 1 x 6550 tubes
(Total 6 tubes)
Made in Russia / Reflector Factory
1980 made ultra rare nos tubes.
Tubes tested and Guaranteed,
Tested by my russian millitary tube tester L1-3
I use audio research aniversary pre-amp, REF210 power and REF2 phono,
And I am sure, i am believe in that you will take very best sound.
If you need power amp. tubes please contact me.
Shipping from Moscow.
Shipping cost 20$,
Shipping time aproximatelly 12-16 days.