RCA 5963 12AU7 Tube Pair. HP Label. Matched and Balanced.
- 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 5 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.