Heinz Schmitz wrote:

N_Cook wrote:

Where would they have come from ? some batch of other double tetrodes and
markings removed ? all Chinese script so scrubbed off ?

Rumors say, that some tubes from me-too-ers have been remarked
to appear as from a high-quality producer.

4 presumably ECC83 in a Laney (not originals) all test bad C/H leakage and
bad/ low or marginally good gain.

If they have bad leakage, where they came from is irrelevant, other than avoiding
buying the same.


To be certain, you have to eliminate the "presumably"

Very likely ECC83 it has to be said.


(by measurement?).

If they're stuffed, measurement won't help.


Graham