Mojotone JTM45 Build - Last Step - Bias Pot

[ThreeChordWonder]

I'm a little confused how I should be wiring in the 50K bias trim pot.

The pictorial circuit diagram seems to show only two wires going to the pot.

The schematic circuit diagram, however, shows a different arrangement, with all three lugs on the trim pot connected

Help please!

 

[Marcomel79]

This is how you should wire it.

By the way, are you running EL34s in your JTM45? Usually it would use a pair of KT66...

 

[ThreeChordWonder]

Thanks for the answer.

The Mojotone kit uses EL34s. Marshall switched to EL34s at some point too. See

History of the JTM45

The first amp ever made and sold by Marshall. It's got a bit of a history and we have a go at telling it.

marshall.com

 

[Vpvalmus]

Where do you find the laid out schematics v. the traditional? Those are awesome.

 

[Phoenix1]

Where do you find the laid out schematics v. the traditional? Those are awesome.

I built a JTM 45+ from Tube Depot and the tech documents are in there ! Only two pins are connected in that also.