Help needed in identifying an ECC83

[DaveW]

Hi,
Does anybody know what make these are, I have three from an old amp but they have no markings except for ECC83







Thanks for looking,

Dave

[kleuck]

RFT i think

[DaveW]

Thanks Kleuck, I have found some RFT pics on the web and I think you are spot on.

Dave

[Mr_dB]

This one's been ID-ed, but in the future it would be helpful to include a shot of the base, from the bottom. That way we can see if there's a symbol in the middle.