Kt120's won't work in a D115 so would be surprised if they would in a D70.
3 responses Add your response
The D-70 was never designed to use KT-120's. Winged C's are going away because the factory burned down so when they're gone, they're gone. That being said the 6550WE's are just as good and available. That is the tube ARC is using currently. Regarding Winged C's vs. KT-120. The KT-120 is just as reliable as the C's. The KT-120 is a very robust tube and capable of greater output power than the 6550 provided the filament supply is up to the task.