I used to be able to pick up NOS Amperex 845's for about $60- at K-Mart until they went Chap. 11. Of course, I'm just kidding! However, the man that you want to speak with is Andy Bowman at Vintage Tube Services. (www.vintagetubeservices.com. Tel. # is 616-454-3467). You'll definitely be impressed. Since he is a one man operation, it's best to CALL, not email, but definitely check out the website! I've used other so called "tube gurus" who fall way short when compared with Andy. Happy Tunes!
