choosing Sylvania 6L6gc

[zodiac272]

hey,

when looking for sylvania output tubes, like the str 415 or str 387 how will i know if they are plug and play in a mark series amp? what values should i look for?

thanks
scott

 

[thunda1216]

since these tubes were most often original equipment in the Mark amps, they should all be plug and play. Tolerances were a *lot* tighter back in the day. We never even thought about *biasing* an amp. When a tube went down, we just bought *one* to replace it.