Biasing a Fender Blues Junior Question

[jar0ahr]

Is there an adjustable bias on the blues junior or is it fixed bias? I have biased many of my bigger amps with 6l6's and el34's but not an el84 based amp yet. I just ordered an el84 bias test lead.

Thanks. John

[52 Bill]

Is there an adjustable bias on the blues junior or is it fixed bias?
The original circuit is non-adjustable, but you can either change resistor values or find a way to add a trimpot to make it adjustable.

[stokes]

The schem I have is very fuzzy,but it looks like you could change R31 to a 50k cermet pot to make it adjustable.