made in France in 1970 (all tubes have same code 7026)
Full Wave Rectifer Power supply tubes
Tubes are unused, NOS, high emission, perfectly balanced and matched.
all tubes have similar measurement
Black plates, O-getter
I think it would be the great idea to rewire the socket in your amplifier using rather poor sounding
Chinese 6Z4 or Russian 6C4P which are same tubes as 6X4
but have different pinout, as you can see at one of the pictures -
you will only need to rewire pin 7 to pin 6 and pin 5 to pin 7
or just use 6X4 to 6Z4 adapter
so you will be able to use great sounding 6X4 tubes
price is for one tube
I always send the tubes by priority registered mail with tracking number within hours after receiving payment