3 Channel guitar preamp

[gtudoran]

Hey guys, this is my latest build. A 3 channel guitar preamp. Main features:

- 3 switchable channels (it can be done MIDI compatible);
- Separate EQ and Gain/Volume controls for Clean / Crunch-Lead

- preamp schematic https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/PREAMP_SCH.pdf
- hv psu schematic https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/HV_PSU_SCH.pdf
- pcb transfer for both of them https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/PREAMP_PCB.pdf  https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/HV_PSU_PCB.pdf
- topsilk for both of them https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/HV_PSU_TOPSILK.pdf  https://dl.dropboxusercontent.com/u/15275178/Preamp_Rack/PREAMP_TOPSILK.pdf

Any question will be answered

Best regards,
Gabriel Tudoran
Analog Sound

PS: the PSU requires a Xformer with this data: primary 120 or 220v, secondary: 6.3v @ 1.2A and 190-0-190 @ 20mA
PPS: the switching mode is one of your choice (you can use relays or you can use switches), the lead channel use all triodes form the top


Pictures:

[tca]

Sound samples?!?!

[gtudoran]

A small sample: clean and drive

@tca: https://soundcloud.com/analog-sound/tubepreamp

Sorry for my sloppy guitar skills.

Best regards
Gabriel Tudoran
Analog Sound

[tca]

^ Thanks.

[Gus]

Looks like you are loading the first tube with a tone control/volume circuit and a 470k with a 180K plate resistor?

[J0K3RX]

Missing some cap values..

[gtudoran]

The decoupling caps from the cathodes are not missing. As you can see, i've put one on every stage. They are not necessary, you can tweak according to your taste (1u  to 2.2u will be more the ok).

Regarding the first tube: @Gus can you continue with the idea   i didn't notice any problems.

Best regards,
Gabriel Tudoran
Analog Sound

[gtudoran]

General request; some guts pictures.









Best regards,
Gabriel Tudoran
Analog Sound

[fastbreak78]

Man, that's sounds fantastic! If you think your playing is sloppy, gtudoran, then you may have never heard mine!