Ever try one of these EL84 to 6V6 adapters? Geared toward guitar players. How about for hifi?
https://www.amazon.com/VHT-AV-SP-AD...kills&sprefix=el84+to+,alexa-skills,89&sr=1-1
https://www.amazon.com/VHT-AV-SP-AD...kills&sprefix=el84+to+,alexa-skills,89&sr=1-1
The EL84 and 6V6 tube parameters are quite different.
The 7591 parameters are closer to an EL84, versus to the 6V6.
Caution: the 7591 Octal pin-out is different than a 6V6 pin-put.
EL84:
Filament 0.76A; Gm 11,300 uMhos; g1 g2 u = 19
6V6:
Filament 0.45A; Gm 4,100 uMhos; g1 g2 u = 9
7591:
Filament 0.8A; Gm 10,000 uMhos; g1 g2 u = 17
After correctly wiring a 9 pin to Octal adapter
(One for a 7591; and one for a 6V6),
The 7591 might be "Plug and Play"
The 6V6 might be "Plug and Pray"
To prevent "Plug and Pray" . . .
I am guessing those EL84 to 6V6 adapters may have either a self bias resistor and bypass cap, or a zener, - from the tube cathode to the cathode output pin of the adapter.
A properly wired adapter for 7591 to substitute "as an EL84", would work with nothing more than wires; and would be "Plug and Play".
Depending on the rest of the circuit values, you may have to adjust resistors, voltage, etc. especially to get good performance from a 6V6.
The only thing to be careful of, is the increase of the filament current from 0.76A to 0.8A (not a problem unless the transformer is already overloaded and hot.
I have some New 7591 tubes that need to find new homes.
Just my opinions
The 7591 parameters are closer to an EL84, versus to the 6V6.
Caution: the 7591 Octal pin-out is different than a 6V6 pin-put.
EL84:
Filament 0.76A; Gm 11,300 uMhos; g1 g2 u = 19
6V6:
Filament 0.45A; Gm 4,100 uMhos; g1 g2 u = 9
7591:
Filament 0.8A; Gm 10,000 uMhos; g1 g2 u = 17
After correctly wiring a 9 pin to Octal adapter
(One for a 7591; and one for a 6V6),
The 7591 might be "Plug and Play"
The 6V6 might be "Plug and Pray"
To prevent "Plug and Pray" . . .
I am guessing those EL84 to 6V6 adapters may have either a self bias resistor and bypass cap, or a zener, - from the tube cathode to the cathode output pin of the adapter.
A properly wired adapter for 7591 to substitute "as an EL84", would work with nothing more than wires; and would be "Plug and Play".
Depending on the rest of the circuit values, you may have to adjust resistors, voltage, etc. especially to get good performance from a 6V6.
The only thing to be careful of, is the increase of the filament current from 0.76A to 0.8A (not a problem unless the transformer is already overloaded and hot.
I have some New 7591 tubes that need to find new homes.
Just my opinions
