Matched pair: Ericsson 5591 / 403B vacuum tubes - made in Sweden - new old stock - original boxes - newest Swedish 6AK5 tube
Matched pair: Ericsson 5591 / 403B vacuum tubes - made in Sweden - new old stock - original boxes - newest Swedish 6AK5 tube, matched pair: Ericsson 5591/403B vacuum tubesnew old stock - wonderful conditionoriginal boxesgm (gain) matched.
Product code: Matched pair: Ericsson 5591 / 403B vacuum tubes - made in Sweden - new old stock - original boxes - newest Swedish 6AK5 tube
newest matched pair: Ericsson 5591/403B vacuum tubes
new old stock - wonderful condition
original boxes
gm (gain) matched (within 6%)
made in Sweden
tested on a Hickok KS-15874-L2 Cardmatic tube tester