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Interesting... Well, I guess your original idea of using the FX mix pot as a switchable master was right on. :) I'm really interested in what your tech says about the amp.

Sorry for the confusion. For a switchable boost, simply set the two channels equally without the loop engaged. Then, engage the loop and turn the volume down just a little. With the FX loop engaged you have your rhythm volume. With the loop bypassed, you get your solo boost. Keep in mind...

Yes, Mesa's switches will work too, they're just more expensive. You could build a Mesa-type switch for about $10 using top quality parts.

Yes, the FS-5L will do the trick. I have one and it works great. It even has an LED powered by an internal 1.5V battery. When I first got my F-100, I built a remotely switching Master volume for the FX loop. It defaulted to attenuation, and if I pressed the FS-5L's button it switched to true...

If I owned a Tremoverb, you can bet I would've been doing this already! :) From looking at the schematic, you can see that the FX send pot is 25k to ground. The FX Mix pot duplicates that function with the FX return tip grounded. So, as long as the FX send pot doesn't cause a problem, neither...

LOL! I can understand how all the “Master Volumes,” “FX,” “Switching,” and “MIDI” can get confusing. Take heart though, it’s rather simple to understand when each piece is taken by itself. 1) You are correct that the F-series has no overall master for both channels, hence the mod which works...

Both channels are equally affected by this mod, so IMO, what you did last night had nothing to do with this problem. Does the second channel switch cleanly from FX loop BYPASS to ON such that the volume change is evident from the Mix pot?

Canon, can you describe the exact problems that you're experiencing with your amp? Perhaps the clean channel drives the FX recovery tube (V4a) so hard with the FX send pot cranked that it goes into cutoff.

Well, from your description, it seems you did everything correctly. The fact that it worked at all pretty much means that you did it right. Since I don't have a T-verb around to play with, I can't say for sure, but I think you might just have had a stinking case of coincidence or an...

If you could detail each step exactly like you performed the mod that would help. For instance, did you use a single cable or two jacks? Did you put the plugs in the correct jack? Did you verify conduction between the soldered points? Like I said before, I can't imagine anything in this mod...

The FX MIX Pot master mod and FX switching jacks are totally separate. Look at the schematic I posted. All the FX loop switching jack does is send a signal to the amp that the FX loop is to be taken out of the circuit. The jack simply needs the sleeve to be shorted to the tip, which is what a...

Yeah, the FX Loop switching jack is on the back of the amp and takes a 1/4" instrument cable. You can use any latching switch you have lying around. If you would also like to check out this mod so we can get some empirical data, that would be nice. I can step you through the process if...

Canon, I'm really sorry to hear you're having problems. I don't understand what happened with your amp? There's nothing you can do to the loop that will cause your tubes to fail. Of course, I can't guarantee that you performed the loop mod correctly, but a bad solder joint, intermittent...

I designed the FX Mix Pot master, so don't expect to find it in the manual for the F-series or the Rectifiers. :) The FX loops of the F-series and Tremoverb are fundamentally the same, so it will work. If I had a Tremoverb, it would only take me a few minutes to check it out. BTW, if anybody...

You can get a solo boost the same way with a parallel loop. Just set the FX loop mix to 100% and use the volume pedal as you described. In addition, you can use the parallel loop to better effect by turning the mix down to a low percentage such that the volume pedal only adds 3 dB or so of...

Yes, it ought to work. From the schematic I saw of the Tremoverb's loop, it's the same as the F-series (as are most Mesas BTW) with the addition of the parallel-foot-switched path. I didn't see the switching jack on the FX send jack, but I'm sure it's there. Do exactly the same mod as I...

I'm not particularly fond of the tone, but it works. For playing with headphones you'll have to adjust your EQ drastically. It's a nice feature that a lot of amps don't have.

Try these settings: If you're not using anything in the loop, this is a quick way to add an overall master so you can get the amp's channel master's up over 9:00 which is IMO where the amp starts to sing. A volume pedal, EQ, Multi-FX or equivalent in the loop will also give you an overall...

That cable will work as long as ground is shared. You need to make the measurements above to figure out what we need.

Cables aren't going to do us any good until we find out what we need for the design. If the jacks all share ground, then a five conductor cable will work fine. He's what you need to do. Connect a 1/4" instrument cable to on of the external plugs (let's use Channel). Now, looking at the...