Pin 1 is connected to the metal envelope - that might cause some issues for existing designs (sometimes pin 1 of the socket is used as the turret for some parts - there might be the high voltage on it). Otherwise they are the same.
Electrically ?---- yes they were used by US/UK military communications equipment I have a lot of them .
They get hot but don't let that put you off and some have pin 1 connected internally so don't connect plate voltage to it before checking it out with a multimeter.
Yes many people with guitar amps in the USA "swear by them " just don't overrun them and (personal experience ) they don't like water (rust ).
One guy says (ex US military ) he fitted them to stop the shrapnel putting an end to his guitar playing.
They get hot but don't let that put you off and some have pin 1 connected internally so don't connect plate voltage to it before checking it out with a multimeter.
Yes many people with guitar amps in the USA "swear by them " just don't overrun them and (personal experience ) they don't like water (rust ).
One guy says (ex US military ) he fitted them to stop the shrapnel putting an end to his guitar playing.
All old style 6V6 (metal) and 6V6GT tubes have the same internal guts. The 6V6GTA's also have the same internal structure but the heater has a controlled warm up characteristic for series heater string applications.
Almost all metal tubes tie pin 1 to the metal shell. Pin 1 on the socket should be grounded to prevent a negative charge buildup on the metal shell. When stuffing metal tubes into amps made for glass tubes make sure that pin 1 is not used as a tie point for some high voltage connection. I had to learn this the hard way back in the 1960's with a Stromberg Carlson PA amp and some metal 6L6's.
As with most tubes, anything goes with modern new production tubes, but this is especially true with the 6V6 types.
I have 8 NOS metal 6V6 tubes. I have run them all in applications that produce up to 30 watts per pair. I always test the designs with old style glass RCA 6V6GT tubes just to make sure that nothing is glowing inside the tube before installing the metal tubes.
Almost all metal tubes tie pin 1 to the metal shell. Pin 1 on the socket should be grounded to prevent a negative charge buildup on the metal shell. When stuffing metal tubes into amps made for glass tubes make sure that pin 1 is not used as a tie point for some high voltage connection. I had to learn this the hard way back in the 1960's with a Stromberg Carlson PA amp and some metal 6L6's.
As with most tubes, anything goes with modern new production tubes, but this is especially true with the 6V6 types.
I have 8 NOS metal 6V6 tubes. I have run them all in applications that produce up to 30 watts per pair. I always test the designs with old style glass RCA 6V6GT tubes just to make sure that nothing is glowing inside the tube before installing the metal tubes.