Here is a very rare tube,  offered in an even rarer balanced and matched pair, the type 5998 made in the USA by Tung Sol.  These are a superior version of the 6AS7G or GA, the 6080, and the 421A.  I have a limited stock of 1967 dated military issue tubes like the one in the picture, and they are unused new old stock.  This tube is in super high demand and supplies are very scarce today.  Prices are likely to double in the next 5 years for this tube.  Balanced internally within 5% Gm, and from tube 1 to tube 2 also within 5% Gm.  These test as unused at 14,500 to 15,000 Gm on our Hickok USM118B where 9000 Gm is minimum good. 30 day Satisfaction Guaranteed warranty.  IL residents pay 10% tax, outside of IL there is no tax.  We ship worldwide, all shipping is by first class mail only.

TERMS OF SALE: Serious bidders only, please.  Payment by PayPal is expected at auction close, and you must have a PayPal account in order to bid on our auctions.  We ship by first class mail to the name and address of the winning bidder provided to us by PayPal and/or eBay.  We declare the full value on the customs forms for any international shipments.  We add $1 to the shipping to cover handling fees.   Please use the eBay shipping calculator to estimate the shipping fee BEFORE you bid.  International bidders should be aware that first class mail cannot be tracked and that processing delays up to several weeks can occur in customs, which is beyond our control.