Home Forums Design and Building 2 Stroke Amplifier Design and Building Modding the boost/voice switch

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    Hey guys: I built my amp with your help a couple of years ago. Its been awesome and I still play it a lot. I have been modding a silverface deluxe reverb and got an itch to mod my 2 stroke.

    Any suggestions for modding the 2 stroke to get a tweedier tone or a higher gain tone? (modding the boost/voice switch seems like a place to start maybe). I saw another thread on modding the 2 stroke, but didn’t see much in this particular area.

    Thanks for any suggestions!


    You could try changing the cathode bypass caps (C8 & C9). Remember you’ll have halve or double the value of the cap to hear an appreciable difference. You could also try lowering the plate voltage on the preamp tube to get a bit less headroom and add more grind. Also, you could easily add a solid-state full-bridge rectifier. It’s super easy to build using the 4 unused lugs on the rectifier tube socket and will cost about a dollar (4 diodes and some hookup wire). The SS rectifier will tighten the bass and punch up the mids (and it’s a little louder too). I put up a schematic for a switchable tube/SS rectifier version for the 2 Stroke here a long time ago.
    Good luck.


    Robin, I looked for this link (or thread or whatever) but couldn’t find it…any chance you could give us a couple of gutshots of how you did this? T’would be cool!


    Here’s the schematic for the switchable rectifier, build it on the back of the rectifier socket, using the 4 unused lugs. 1N4007 diodes work great.

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