Xenrelic Luminary Overdrive Hi Gain Plexi Mod.

[joey]

Chris came here a few years ago (Ski vacation with his lady) we went to eat at a good restaurant in Montréal, was the first time I actually met Chris in person (we talk on phone a lot) anyway, he then start explaining me that the most you can get from a 12ax7 is 55-60% of the gain more then that that is «noise»

You can only achieve 60% of a 12ax7's MU because its intrinsic resistance is too high to allow anything more in any practical circuit. The noise floor has nothing to do with the theoretical limitation.

he has a mod/way to go up to 100% using a transistor....I don't have a clue how you do it still!! lol maybe it is a «diode clipping» thing a la C e rrem, it was still is experimental he says, might not sound right ...I don't know.....

That's a very easy thing to do. You can use a transistor, MOSFET, etc and do a few things with it in order to achieve that. You can use it as a current mirror/sink, or you can set it up as a follower and bootstrap it, which is a form of mirror.

[mightymike]

How would you wire that up? That sounds really interesting

[joey]

How would you wire that up? That sounds really interesting

You just take that bootstrapped cf in your other thread and replace the tube cf with an enhancement or depletion mode MOSFET and that's it. you might also want to add a stopper to the mosfets gate.

I wouldn't use this as a last stage though only first where the signal is low.

[xenrelic]

Version 5: http://home.comcast.net/~xenrelic/XLO_Schematic_V5.pdf

[biggs]

I have built up a version three and it's Awesome! I have a question However. I'd like to add an effects loop. I have taken the center wiper of the Treble to the send and the return to the PI .022uf. The top end is rolled off significantly. Where would you suggest I add one or what would you suggest to fix the HF roll off?

Thanks so much for sharing!

[xenrelic]

I have built up a version three and it's Awesome! I have a question However. I'd like to add an effects loop. I have taken the center wiper of the Treble to the send and the return to the PI .022uf. The top end is rolled off significantly. Where would you suggest I add one or what would you suggest to fix the HF roll off?

Thanks so much for sharing!

Which loop design are you implementing?

I've found that the only loop that works well with this design is the Metro Zero Loss FX loop. You can add a 1MA volume control after the Zero Loss loop as well, or just use a LAR/MAR PPIMV.

Here's version 3.3 of that circuit you're using:

[biggs]

Which loop design are you implementing?

I've found that the only loop that works well with this design is the Metro Zero Loss FX loop. You can add a 1MA volume control after the Zero Loss loop as well, or just use a LAR/MAR PPIMV.

Here's version 3.3 of that circuit you're using:

Schematic: http://home.comcast.net/~xenrelic/XLO_S ... c_V3.3.pdf
Layout: http://home.comcast.net/~xenrelic/XLO_Layout_V3.3.pdf

It was just a passive loop. I was planning on grabbing one of the Zero loss loops and trying it. I assume I use the same connection points as I mentioned above? Are you going to put out a ver 5 layout? Ive had a few folks hear this ver 3 and they were all very impressed with it. You do good work man!

[Jeremy1283]

DO you have any sound clips of your amp?

[rjsamplification]

Every Picture layout link is broken.

[tubekiller007]

schmetic is not available.
share or link?

[tubekiller007]

Where is the wiring diagram available?