After much flailing and gnashing of teeth the next Tortuga Audio product is coming out of hiding as it winds its way through the latter stages of development. This time I'm going to take a different approach insofar as I'm going to be sharing quite a lot of information early and often all the way up through release and early production. So get your popcorn out ...
For now I'll be referring to this preamp as our LDR Tube Preamp. The official product name may differ.
This preamp is the culmination of several years of work on both our LDR based attenuator/preamp controller used in our passive preamps plus our hybrid tube buffer. The LDR Tube Preamp combines the most current/updated versions of these into a single integrated LDR preamp/enclosure. I'm unequivocal that this LDR attenuator/tube preamp marriage will sound outstanding because it already does sound outstanding as separate components linked together externally.
Here, in abbreviated form, are the highlights of this upcoming preamp:
1) LDR (light dependent resistor) based 100 step balanced attenuator - 60 dB range. Will probably use our existing V25 preamp controllers/attenuators but we'll move up to the V3 once it's available.
2) Unity gain hybrid preamp with a tube (6922 family) input stage and a discrete solid state JFET output buffer stage using an updated/improved version of our existing TPB.V1 tube preamp buffer
3) Flexible - handles both balanced (3) and single-ended (3) inputs in a single model so you don't have to choose between what signal type.
4) Rugged heavy-walled extruded aluminum casework/panels. Could probably run it over with a car and it would still keep going.
5) White on black 256x64 bit OLED graphical display for control located behind dark acrylic front panel lens - invisible when off.
6) Simple 7 button generic Apple remote
7) Powered via AC mains with toroidal transformer and linear supply into switching DC-DC regulated tube heater circuit and split voltage tube plate power circuit with very high PSRR
Eight) Approximate dimensions excluding knobs/jacks/feet etc. | 12 inch wide x 8 inch deep by 3 inch tall. Knob and jacks will probably add no more than 2 more inches to the depth. Feet will probably add no more than 1 inch to the height.
9) Unit weight will likely be somewhere in the 10-15 pound range.
I'm not going to speculate on an availability date yet because I've always been wrong in the past but you'll know when I know if you follow this thread. But I'm committed to getting this done as soon as we can. Also not going to discuss final price yet but early adopters signing up for pre-orders will secure a substantial discount.
The pics below are 3D CAD screenshots. Final appearance and physical details are subject to change but I doubt it will look much different than depicted here.