Bassman aa864 master volume mod

[Davebassman]

Hi,

I want to mod my fender aa864 to add a master volume ( post phase inverter ). But I have a question... The cable thick does matters? The cable that I have is a XLR mic cable.

https://ibb.co/Gd5DnpL

thanks.

[Helmholtz]

Cable thickness does not matter.

[Chuck H]

Cable thickness does not matter.

This^^^^^^^^^^^^^^^^^^^^^^^^^

But cable routing and shield grounding can. Try to keep the leads as short as practical and don't ground the shield with anything mains, power amp or filament related.

[pdf64]

I think that using such cable may make the job rather more difficult (and so likely to be unsuccessful, especially so if the operative lacks a good level of skill and experience).

[Davebassman]

I've done...

yes, it's a bit difficult. But I don't know if I prefer an attenuator or a MV...

https://ibb.co/wrfD9N3

https://ibb.co/wBy6NSH

[pdf64]

Well done, the cable look a bit more manageable than the 6mm dia type I envisaged.
Be careful with its screen termination, can't quite see what you're connecting it to, but you mustn't let it ever risk shorting the blue bias feed wire to chassis 0V.

[Davebassman]

The blue cable goes to the bias pot, and the shield to the pot ( only one termination ).

Thanks!!