oh , i missed the thread, thanks !
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Okay, we're opening a can of worms here, just for you HF'yers.
Makers of 5670/2C51 on record: (we are not going to do a sonic ranking between the valves in each category - way too subjective).
WE USA (as 396A) (there are D and O getter versions) - probably the best of the lot but good luck in finding original 'good' ones from reputable sellers for £££
Bendix USA (as 6385) - very rare and hyper expensive
GE 5670 USA - as used in iTUBE
Tung Sol USA
Soviet Russia (as 6N3 - mostly Reflektor Saratov, marked in Cyrillic so looks like 6H3)
China (as 6N3)
The 5670/2C51 has similar data and application as the later European ECC88 and variants, so European valve makers concentrated on that type of valve.
Some valves marked "England" have been sighted, these appear mostly remarked Russian units.
Sylvania also made a 5670 which was also seen remarked as "Mullard" but it isn't a true Mullard as they never made this version of valve, just a rebranding job.
To conclude, with the iTUBE, we would not spend our hard earned on anything but the WE396A or Bendix USA.
Note 1 - some background, the 5670/2C51 from a technological point of view, the "premium version" of the 6922 tube. Better design, strong plates, lower microphonics etc etc...
So if you have the 6922, you can roll the valves in your non-iFi device and get better sonics but with the 5670/2C51 family, you are already running with the big guns.
Note 2- the 5670 and 6922 have the same physical pins but are not interchangeable as they different fundamental designs. So DO NOT insert a 6922 into the iTUBE. Or vice versa!
We have not tried the 6385 but the iTube has space for full-size noval tubes (e.g. Soviet 6N3PE) so it should fit, there is even enough heater current available so electrically, it is okay, and probably mechanically too.
BUT both WE and Bendix are nowadays extremely overpriced and do not always sound better than the GE5670. The GE5670 is in the top group of a premium tube that is unloved because its pin outs are different.