Vox AC15 based on Hoffman AC30 layout

[Big_Mike]

Hi guys,

I am gathering materials to build an AC15 from a Hoffman AC30 layout.  I get that you simply remove two of the output tubes and increase the cathode resistor, but I would like some help modifying the Hoffman layout as follows:

1.  Change from tube rectification to solid state rectification.

2.  Add in a Lar-Mar PPIMV.

Could anyone help me with modification of the Hoffman layout?   Thanks.

[passaloutre]

Neither of those requires a change to the layout. You can put a rectifier on a couple terminal strips, and the LarMar is built on the pot.

[Big_Mike]

I guess what I am trying to figure out is how to incorporate diodes for the solid state rectifier on the board layout.  I think I figured out the wiring points for the Lar/Mar PPIMV.  Could anyone help me with a turret board layout diagram for a solid state rectifier?

[sluckey]

If I were using Hoffman's board I would just replace the two 100Ω filament resistors with two 1N5408 diodes and make a couple minor wiring changes. Like this...

[Big_Mike]

If I were using Hoffman's board I would just replace the two 100Ω filament resistors with two 1N5408 diodes and make a couple minor wiring changes. Like this...

Thanks Sluckey, much appreciated!

[Big_Mike]

Sluckey, to install a Lar/Mar PPIMV, I assume you remove the two 220K resistors after the phase inverter and install a dual gang 250K pot?  Thanks!

Mike

[sluckey]

Yes . Also put a 2.2m between wiper and ground lug of each pot for safety. If you will also have a cut pot then look at page 3 of this pdf to see a neat way to install the mv...

     https://sluckeyamps.com/dual_lite/dual_lite.pdf

[Big_Mike]

Yes . Also put a 2.2m between wiper and ground lug of each pot for safety. If you will also have a cut pot then look at page 3 of this pdf to see a neat way to install the mv...
     https://sluckeyamps.com/dual_lite/dual_lite.pdf

Cool, I was wondering how to incorporate a cut pot with a Lar/Mar master and plan to have it with this amp.  Thanks for the info!