Sheppard Designs

Sheppard Designs Devoted to the engineering development and manufacture of professional grade guitar effect processors and tube amplifiers

12/15/2020

Looking forward to installing the tunnel diodes into my modified PROCO RATT II. Simple change-up as we're talking about hard clippers to ground. I made only a few of these as prototypes but there exist no tunneling topos.
Prof Whitten has one on the three but it has encountered a problem that begs investigation. SO...IT WILL BE HIS PEDAL TO TRY THE TUNNELS!!. Mounted the wires to the SO board and she's ready for v install. road tripppppp.

11/28/2020

Further studies and investigation of the tunnel diode....AKA " fear & loathing on the tunnel trail"...

It should come as no surprise (at least to the engineering sector) that clipping topologies, both hard and soft varieties, affect the upper (peak) portions of the sinusoidal waveform. *The "tops", if you will*.
This includes the entry signatures as well as full clip duration signatures. The variances occur for the reasons already known.
With tunneling diodes, things are a bit different due to the negative resistance regions of this component. One sees impact on the SIDES of the waveform AS WELL. This is directly linked to harmonic results. this is very different from the silicon or germanium world. Expectations are high in the ability to maintain a degree of dynamics with tunnel diodes. For now, the package is presented to replace the back to back topology of 2 diodes in opposite polarities. This hampers my interest in applying a compliance topo to swing between odd and even order content via a pot. Compliance, in terms of amount, can still be tested (luckily) and I'm looking forward to good results on the hard clipping side of various designs in mind. Wish to provision high degrees of versatilities, as always, ... allowing the player to paint a myriad of tonal possibilities.
hang tight.... it's coming..nothing like shaking things up and away from convention....
especially knowing that the change is based upon quantum mechanics. Very cool.......Will keep those interested updated as I move through testing phase.
Something very different, indeed.

11/26/2020

happy Thanksgiving to all. stay safe.

11/18/2020

Bruce....which clipping selector switch are you using?. one position is back back 914's....another position is stacked 914's and the latter is LEDS . 3 position switch

11/17/2020

well..the shop is torn down and a rework is in order starting tomorrow a.m.
hope the wife doesn't mind my use of stove should I need to solder thangs!!!!!!

11/17/2020

Glad to hear Brian has placed the Supro 16T emulator on his board. hell yes!!!!

11/17/2020

Touched base with professor Bruce Whitten tonight. Amp work to be done indeed.
Glad to hear he's using several of my pedals......that's a "feel-gooder"!!!!

Wage Huge assembly today.much more importantly (however) is the furtherance of the tube preamps.  gonna get a studio pie...
11/08/2020

Wage Huge assembly today.
much more importantly (however) is the furtherance of the tube preamps.
gonna get a studio piece together for my buddy's studio.
six (6) tube preamps in one rack mount.
voicings as follows :
1.) basic Fender, 2 stage then dump to the tone stack. fender tone.

2.) Dumble topo with extra drive levels to suit different players. definitely keeping the dumble tone stack.
3.) Marshall style voicing
4.) Vox style voicing
5.) hi gain topo... a'la SLO.
6.) CUSTOM tuned 2 channel that does many dances.
of course, these will evolve into specific tube pres with specific controls relevant to each. sure is nice to get true tube results instead of trying to get "close " with op amps and jfets. differences easily heard by these dog ears. then there's the switching housekeeping for each topo...geeze.

not to get too far ahead of myself... am still waiting on my pcbs for the various amp emulators and will get those built for those who are waiting (a lot!). have taken a pause on assembling perf boards. a couple are ready for the likes of Travis, Bruce, Fielding and Jeff (many others i would add) . Will get to it when the boxes eventually arrive.
Am having to review several previously designed op amp based pedals after tasting the quantum tunneling devices in order to ADD these to the existing clipping topos. pain in the arse as this could affect the board layouts. am considering an additional clipping select board design so as to not impinge upon existing pcb layout. it will be worth it however...
guaranteed. sometimes small or even large changes on the front end clipping requires some tail end tone stack modifications for the sake of balance.

the tube topos I'm definitely absorbed with... pcbs on their way. time to look at related enclosures to house these bad boys. tubes baby... nothing compares. never will, either.

here's what the 6 tube pres rack mount looks like. pro level indeed

11/06/2020

nanodevices. man-o-man. Game changer in the clipping world. These E/I curves are out of this world. Without question, I shall be making use of quantum tunneling in some upcoming pedal designs.
Look for this new approach to clipping to make some serious inroads to improving the old silicon or germanium schools of clipping.
I am blown away by this.

10/18/2020

Looking forward to creating several prototypes for Doug Peters in the very near future! I greatly appreciate his participation in testing out a few designs. Great player with good ears!!!! Valued feedback!
THANKS DOUG!!!!

10/12/2020

will be toying with 18 volt rails on the mesa mkI emulator. it must be tasted ..

Lots of perf board work today. A scattering of amp emulators being tweaked.  I see an 18 watt Marshall pedal......I see ...
09/20/2020

Lots of perf board work today. A scattering of amp emulators being tweaked. I see an 18 watt Marshall pedal......
I see a Dumble emulator....and I see a Mesa MkII in the works. JFETS biased so sweetly..
What a mess of toneful bliss....

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