- Aug 14, 2020
- Reaction score
Are these 7581's ? can they be used as a replacement for KT66 ?
7581, like KT66 and 5881, are part of the 6L6 valve type family.
So there’s a fair degree of compatibility / interchangeability between them all.
Just to note that the rating system used for Soviet military valves there needs to be considered.Sovtek coin base 5881s. They have a rated max plate voltage of just 250 volts (That's what the docs say!) so no, they'd be a TERRIBLE choice for replacing KT66s.