12AU7 Pair. NOS. Short Grey Plates. China.
- Testing is done with Superior TW-11 Tester. This tester is a cathode emission tester. The results are useful for relative matching of same type tubes, and also a good/bad result. Tubes are checked for filament continuity. The results should be taken as a general indication of tube health.
- I am happy to combine shipping on multiple purchases. If it is just tubes, I will ship up to 3 lots for the single highest shipping price. Please wait for an invoice before paying. You will find the invoice, once issued, in your shopping cart.