1) way into tone-you think w/tube switch, n maybe actual switches amp will be ok for studio/live rig? looking for amp to build for buddy jim to shut him up about damn cornfords. apologize for lack of punctuation, et al, but leaning over bed to type 1 handed.
2) that is tone i think i want-gotta play it myself, but was thinking about building zendrive or dumble type box-nah...might as well jump in.
3) 1 important thing..does it track fast, or mush if you play fast.
4) in summation---i want that tone........i think.
1) I'm gonna try to make it work with switching,,but right now, I liked the 5879 cranked and that definitely creates a volume balancing issue-
for me2) I really like the tone, but, this first clip doesn't do it justice...I've changed a couple things (and then changed them back)and it definitely sounds better the closer you stay to Tubenit's design!
3) Mine doesn't track as fast as it could...I originally set it up to be run with the 6K6 tubes,,,so I used a 4.7K dropping resistor between the plates and the screens (to be gentle on the screens),,,AND to act as a "sag resistor", so I could get a little bit of the sag feel .....
This is more of my "retirement" tone than any speed demon tone....I want to be able to feel the response and let the notes bloom
I've listened to your sound clips, and I'm no where near as fast and clean as you are

,,,, SO, I would recommend that you would stick with 6V6 or bigger bottles,,,SS rect., with a lower dropper there,,,, and another benefit would be higher voltages to make it through to your preamp, so you could get a little more headroom .....Tubenit's original design has the lower value dropper
4) It's definitely worth a listen...I've pushed 12AX7s pretty hard trying to get an ultimate OD tone,,,,BUT the 5879 adds a quality that you can't get from a 12AX7.......I'm using it as more of a "late stage boost", by running the "clean" channel pretty dirty, and then adding in the 5879 for the over the top tone....
I've spent a lot of time recently with this circuit on the breadboard,,,and some of the things I thought would work
didn't, BUT some of the new things I've tried have just improved slightly on my version of T's very nice design...
Here's a couple notes:
- The 10K shared cathode resistor in the PI (my idea to drop volume) works to reduce the output volume, but takes away from the purity of the tone (no surprise), and contributes to some of the "boxiness" that I described in an earlier post....I've now switched that back to more of a stock value of 820R and the amp sounds much more open and natural than it does in the clip
- The 6K6s sound better as they get cranked (and I really like the OD tone), but I think the 6V6s sound BETTER- (more articulate OD tone) across the board, in all volume settings (I just can't handle the higher volume)
Keep an eye on this thread....I'll continue to update the schematic as I tweak it further :
http://www.el34world.com/Forum/index.php?topic=16447.0