Is My Marshall 1974x Cathode Biased?

[louderock]

Changing power tubes. Just want to be sure that this amp is self-biasing. Thanks.

[phsyconoodler]

Yes it is cathode biased.Swap away.

[louderock]

Thanks. The Ruby tubes sound a bit harsh. Back to the JJ's.

[cfdude]

You think JJ's sound good, put some NOS Mullards in there. Your jaw will hit the floor.