Arfa Daily wrote:

"N_Cook" wrote in message

Where would they have come from ? some batch of other double tetrodes and
markings removed ? all Chinese script so scrubbed off ?
4 presumably ECC83 in a Laney (not originals) all test bad C/H leakage and
bad/ low or marginally good gain. Not a trace of any marking , as low
power valves, presumably no marking originally. They look like any other
ECC83,
no bad cut metal/ broken mica or any other indication of bad manufacture.

ECC's are double triodes, not tetrodes.

Don't forget this is an N_Cook post !

Graham