Alembic F2B! (PCB and Layout)

edge11 · Post by **edge11** » 15 Mar 2012, 23:33

What transformer are you guys using for the pcb?
How much is the shipping for the tube town tranny to the usa?
Is there a cheaper alternative?
Thanks guys.

phatt · Post by **phatt** » 16 Mar 2012, 09:00

You may wish to consider a switchmode supply?
If so,,,This might interest you.
https://www.freestompboxes.org/viewtopic ... 28&t=15954

Phil.

ToneKarma · Post by **ToneKarma** » 25 Mar 2012, 13:33

Hasn´t anyone checked this site for another PCB layout of the F2-B aka Fender Showman preamp ?

http://www.lorcan.me/projects/tube-bass-preamp/

This supplies the PSU and tube board as PCBs.

However I´d use a CF after the last tube stage and not just a pot as suggested on the website.

BTW, the "infamous mod" done by Pete Cornish to Dave Gilmour´s F2-B was likely nothing else as a change of the cathode bypass capacitor to something more useful for guitar and by adding a CF (the "extra tube", that is) to get an output level that can be fed into FX (which is basically what DG does ... he feeds the processed signal into the power amps of his Hiwatt amps later on but not directly after the preamp).

ezugaru · Post by **ezugaru** » 03 May 2012, 15:48

Hey guys! I just found this thread, does anyone still have the files that Darkglass uploaded? the links are completely dead, thanks in advance.

BTW did someone else built it?

Fredenando · Post by **Fredenando** » 03 May 2012, 22:51

This is what I have:

https://www.4shared.com/zip/xBW44Qtz/Al ... LMD09.html

ezugaru · Post by **ezugaru** » 25 Jul 2012, 02:55

Hey thanks a lot!

phantombox · Post by **phantombox** » 29 Jul 2013, 17:57

Would there be another way to lower the outputs that doesn't involve a 2nd tube stage?
Maybe an L-pad or even a transformer to get a balanced output signal?

Phantombox

phantombox · Post by **phantombox** » 29 Jul 2013, 18:29

I built one of these Alembic F2B's. I paralleled the input jack throu a DPDT switch and this works fine for 2 separate outputs. But for some reason, the output jack for both channels (the one that is connected after a 47K resistor from channels A out and B out) doesn't work. Do they have to be 1% precision R's???

Phantombox

phantombox · Post by **phantombox** » 29 Jul 2013, 20:16

On the output jack for both channels, only one comes out. I triple-checked the connections with a digital volt meter. If nothing plugged in only one channel is present. If there is a cable (mono 1/4 plug) connected both channels are present but only one comes out.

Phantombox

delaystomper · Post by **delaystomper** » 09 Jan 2015, 06:20

hi does anyone have the pcb and schematic for the alembic project build by drakglass i would love to build it but i find no documents
can you provide them to me please?
email
crashedsatellite@yahoo.com

snofla1900 · Post by **snofla1900** » 09 Jan 2015, 09:34

You might be looking for this infomation , more behind this link:

http://moosapotamus.net/ideas/alembic-f-2b-preamp/