Using Helix Ext Amp Switch feature to switch Reverb/Vibrato aka Tremolo on a Fender Princeton Reverb

[Chris-7777]

I want to switch the Reverb/Vibrato aka Tremolo of a vintage Fender Princeton Reverb with my Helix, using the Ext Amp Switch function. The footswitch connection of the amp has been upgraded from 2x RCA to TRS. Unfortunately, none of the Helix Ext Amp settings seem to work. I assume that the Helix Ext Amp Switch does not work with vintage Fender Amps. Has anybody had success, maybe by using additional third party equipment?

[rd2rk]

I can't imagine that the switching circuit in that amp is any more than a mechanical ON (circuit CLOSED) and OFF (circuit OPEN) which is what the Helix Ext Amp switch does.

 

Are you using a TRS cable?

Are you sure that the "upgraded" jack even works?

If you have a FS that works (how else would you know that the jack is functional?)  use a multimeter to know which button switches what.

You'll need two switches - one set to TIP and the other set to RING - both set to LATCHING.