Hi I have two pairs of metal based EL34's first pair test 4600 and 4800 on my Hickok 539C (min new 3800)
$325
Second Pair tests 4000 and 3600
$275
Buy one pair you pair shipping ,buy both i pay shipping and insurance .
Will go to EBay with these if they don't sell in a day or so .
5B
SYN two have this marking
BYO
56E one has this marking
BYO
56K one has this marking
Alway open to offers