6550 in Rocker 30

kpunk56 · Post by **kpunk56** » Mon Jul 17, 2017 4:42 pm

Can 6550 tubes be used in a rocker 30 without modification? I have heard alot of good stuff about 6550's

If not what all can be used without mods - 6ca7, Kt77,???

Jondog · Post by **Jondog** » Mon Jul 17, 2017 4:50 pm

6CA7 and KT77 can be swapped without modification. 6550 would need a rebias which is changing resistor values.

kpunk56 · Post by **kpunk56** » Mon Jul 17, 2017 5:23 pm

what would people prefer from 6ca7 to kt77 vs el34

Jondog · Post by **Jondog** » Mon Jul 17, 2017 5:35 pm

I've used them all. KT77 was my least favorite. Love 6CA7's, a fatter sounding EL34. EL34's will probably cut through in a mix better though.

a.hun · Post by **a.hun** » Tue Jul 18, 2017 10:54 am

Also love the (JJ) 6CA7 in the Rocker 30. Mine came with them stock.
Don't think those JJs are exactly typical sounding 6CA7s though, so can't comment on others. But these ones really do give the amp some proper grunt.

Andy.

pedecamp · Post by **pedecamp** » Tue Jul 18, 2017 9:55 pm

Oranges are dark sounding, stick with the EL34.

6550 in Rocker 30

6550 in Rocker 30

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