Switchable V1 bypass cap for 5G9... would this work?

To close the loop here, after I drew about 25 more DIYLC variants, I finally got around to clipping in various cap values.

Turns out I liked the 2.2uF a lot; as @dan40 says above, the 0.68 was just a bit fizzy. This amp/speaker/cab has tons of treble available; it's just that it also has just even more deep rich bass.

And then, there wasn't *as much* difference as I'd thought there would be between 2.2uF and 25uF, so I didn't feel a need to try 4.7uF for instance. Plus then clip-testing (as above) 10 v. 25, I found 10 gave me all the girth I needed.

Finally, (clang-style facepalm) I realized I had a beautiful big switch hole nicely plugged off at the standby location, and had a beautiful Carling SPST full-size switch that'd look perfect there. After a quick check with the forum, I confirmed I could run single-core shielded cable (as per @Jon Snell above -- thanks, Jon) even down there by the noisy AC / lamp / etc. Great solution especially with such a long cable run into noisy territory.

So I did it. And it works perfectly. The 2.2 uF subtracts the extra Darth Vader bass and brightens up my humbuckers and P90s; the 10uF sounds pretty darn stock and lets my Tele thump *and* twang.

 

Oh, and for masochists seeking further details, this post in my follow-on thread has diagrams showing the bypass mod in context...

 

Thanks, Jason. If you and @tubeswell and @dan40 are in the 2.2 Club, it's a club I’m proud to join.

Someone might ask: if 2.2uF is good, why did I keep 12.2 on a switch -- recall that 12.2 sounds like and basically graphs like stock 22 (Nichicon) or 25. My initial thinking was I always like to have an amp able to revert to its stock sound, and here I also liked the stock sound. But will I ever use it, you ask...

Last night I played my strat through the amp a long time with 'after-hours' settings -- plugged into bright at V3-4, normal about V10, guitar on 8-10. The 12.2 voice was *perfect* on some songs; the fuller bass (again, this amp never flubs out on bass) nicely balanced the strat's tenor on position 2. On other songs, or position 4 for comparison, the 2.2 voice was sometimes more balanced. And given that the volume knob was turned down, the tone knob made a useful and *nice* difference in both voices. And turning the guitar from 8 to 10 would introduce some rich creamy tweed-edged OD in both voices, but depending on the tonality of the song and the pick attack, sometimes the bass-rich version would be nicer there, too...

So the switch is a big win. I can imagine using 12.2 with high volumes, too, especially with SCs, maybe especially my lo-output Tele. One caution: This is a 5G9, not a 5E3. Really different amps. If you're looking to try a bypass-cap switch in a Deluxe, I'd for sure start with the smallest value you might want (? .68 or ??) and clip in parallel values like 1, 2.2, 4.7, at least up to 10 or more.