Upscale Audio

russian 6c33-b

electro-harmonix 300b gold grid

tung-sol 6l6gc-str

tung-sol kt150

electro-harmonix kt90

sovtek 6550we

tung-sol el34b

mullard 6bq5 / el84 new production

gold lion n709 / el84 new production

western electric 300b vacuum tube

electro-harmonix 6sn7

sovtek 6h30pi

gold lion ecc83 / b759 / 12ax7

tung-sol 6sn7gtb

electro-harmonix 6922 gold pin

electro-harmonix 6h30pi gold pin

tung-sol 12au7w / 6189

tung-sol 12ax7 / ecc803-s gold pin

gold lion e88cc / 6922

tung-sol 12at7