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Bonjour, info ici (audiokarma.org) :
"7189A is higher rated, but possibly of bigger concern is how the amp is wired. 7189A has some internal connections to multiple pins not done on the 7189 or 6BQ5.
It has to do with pins 1 and 6 (and how hard the tubes are working). 1 and 6 are not used on 7189 or 6BQ5 tubes so sometimes those unused socket terminals are used as tie points. However, on the 7189A, pin 1 is common with pin 2 and pin 6 is common with pin 9.
So, it really depends on how the tube sockets are wired (to heyraz's point) and how hard it's pushing the tubes"
les brochages disponibles sur le NET confirment :
7189A : respectivement pins 1-2 et 6-9 connectés intérieurement. 7189 : pins 1 et 6 libres.
M
"7189A is higher rated, but possibly of bigger concern is how the amp is wired. 7189A has some internal connections to multiple pins not done on the 7189 or 6BQ5.
It has to do with pins 1 and 6 (and how hard the tubes are working). 1 and 6 are not used on 7189 or 6BQ5 tubes so sometimes those unused socket terminals are used as tie points. However, on the 7189A, pin 1 is common with pin 2 and pin 6 is common with pin 9.
So, it really depends on how the tube sockets are wired (to heyraz's point) and how hard it's pushing the tubes"
les brochages disponibles sur le NET confirment :
7189A : respectivement pins 1-2 et 6-9 connectés intérieurement. 7189 : pins 1 et 6 libres.
M