Alembic F-2B Preamp with SMPS Supply

gtudoran · February 08, 2011, 04:32:49 AM

Hey guys,

Just finished my F2B preamp with Ecc83 tube - i used the stock schematic but i designed my own PCB (needed some specific dimensions). 12V DC supply @ 1.2A used for heaters and for SMPS supply - anode voltage is 280v.

Some pictures and 2 sound clips - one with cabsim and one without (directly into sound card, the guitar used was a Squier Strat SSS).

Best regards,
Gabriel Tudoran
Analog Sound

http://dl.dropbox.com/u/15275178/Pictures/250CC-NoCabsim.mp3

http://dl.dropbox.com/u/15275178/Pictures/250CC-Cabsim.mp3

gtudoran · February 10, 2011, 02:10:30 AM

Hey guys, just made another project, this time using 6N16B double triode - the main schematic is a Matchless HotBox (was done as an experiment ), the PCB it's done by me. The only difference between this and Matchless is that i used a BigMuff tonestack (i was a little lasy when i was making the PCB). So here there are some pictures and a little sound clip - the clip was recorded useing the ROG CondorCabsim.

Best regards,
Gabriel Tudoran
Analog Sound

http://dl.dropbox.com/u/15275178/Pictures/MasterDrive.mp3

MichelP · February 10, 2011, 06:48:17 AM

Great looking and sounding builds.

Especially the Matchless-type built with 6n16b tubes. I´ve got some lying around here, I want that sound too !
One question however :
Have you allready built one of these in an enclosure ? If yes is there any noise-issue when using this SMPS ?
I´ve built a McTube with this SMPS, cool sounding but when I assembled it inside an aluminium enclosure I got noise.

gtudoran · February 10, 2011, 06:51:59 AM

No noise in a Al enclosure - use a copper band over the SMPS and use a separate PCB for SMPS ... you should have no problems with that.. ohh and one more thing IF you use the enclosure as a termal radiator for IRF (or any other fet that u may use) don't it will act as a antenna - better go down with HIgh Voltage and keep them cool but don't stick it to the enclosure even if you use a ceramic foil and some thermal grease.

Best regards,
Gabriel Tudoran
Analog Sound

MichelP · February 10, 2011, 06:55:02 AM

:)Thanks for the quick response, I´ll be using these 6n16b´s soon then !

Renegadrian · February 10, 2011, 08:17:25 AM

Nice, I see you can get some quite cheap! I think I am gonna jump on that train too!!!

gtudoran · February 10, 2011, 10:11:34 AM

Wellcome in the boat

if you need any help don't hesitate to ask!

Best regards,
Gabriel Tudoran
Analog Sound

Renegadrian · February 10, 2011, 08:41:45 PM

I bought 4 of them for 10 $ today - hope they will be here soon!!!

karolisd · September 23, 2012, 11:34:52 AM

Hi, could you please post the schematic of the SMPS that you used? Thanks!

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Alembic F-2B Preamp with SMPS Supply