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You run an 8877 at 4 kw out in class B or AB the plate will be overdissipating.
Class C cop out won't help this time because in this class you will be overdissipating the fragile grid.

Pair of 4-400s if cathode driven has a combined screen grid and control grid dissipation of 45 watts for each tube. 90 watts combined verses 25 watts for an 8877. You can make mistakes with that that will take an 8877 out in 2 seconds.

Poor choice of tube to kick the crap out of. Why not for once build a CB amp with a large tube and run the thing so it will last a while?

A friend had one of those Ameritron amps. It hummed for 2 years. The mic didn't pick up the hum and he is a war vet with lousy hearing.....

[QUOTE="HiDef, post: 134216, member: 7734"] You run an 8877 at 4 kw out in class B or AB the plate will be overdissipating. Class C cop out won't help this time because in this class you will be overdissipating the fragile grid. Pair of 4-400s if cathode driven has a combined screen grid and control grid dissipation of 45 watts for each tube. 90 watts combined verses 25 watts for an 8877. You can make mistakes with that that will take an 8877 out in 2 seconds. Poor choice of tube to kick the crap out of. Why not for once build a CB amp with a large tube and run the thing so it will last a while? A friend had one of those Ameritron amps. It hummed for 2 years. The mic didn't pick up the hum and he is a war vet with lousy hearing..... [/QUOTE]

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