GTFO - Full tube high-gain pedal (2x 12AX7)

[pravudh]

For the L1, The 100uH inductor...this spec means it needs to be a 2-3A inductor?
I am pretty sure I have the right ones in mind but just making sure.

inductor current about 2.1A. here is link for detail that i use.
http://www.es.co.th/detail.asp?Prod=63800017
there are some point for trim adjustment, you may get HUM if adjust voltage too hight.
just decrease it lower until HUM is gone.

[gtudoran]

The PCB in the documents is ready to be printed - no scale, just print it , but FYI the size is: 83.19 wide by 74.6 high (size is in mm).

Best regards,
Gabriel Tudoran
Analog Sound

Hi , I am wanting to build this curcuit but I have a few questions/clarifications on the project .....

Firstly I can"t seem to find the dimentions of the PCB layout , in inches or centimeters is fine .......

The mosfet , will any 400v+ mosfet work ??

I have some toshiba TO-247 2sk2698 that are 500v , will they work ??

Thanx a lot !!!

[lespos]

Is it right?!

[gtudoran]

Thank you lespos for your correction.... hmmm that was strange as hell...

Here is the link with the SVG file (i've used SVG bc in PDF format the groundplane appears as horizontal stripes): http://dl.dropbox.com/u/15275178/blast%20from%20the%20past/BFTP_brd_ok.svg
Do not hesitate to put out anymistake that you find.

Best regards,
Gabriel Tudoran
Analog Sound

Is it right?!

[guitarrob]

Could you use a Toroidal-Inductor for the Boost converter or is it better to use a different type?

[gtudoran]

I don't think so, i'm using only rod type inductors.

Best regards,
Gabriel Tudoran
Analog Sound

Could you use a Toroidal-Inductor for the Boost converter or is it better to use a different type?

[guitarrob]

I don't think so, i'm using only rod type inductors.

Best regards,
Gabriel Tudoran
Analog Sound

Could you give me an example of the unit you are suggesting to use?

I appreciate your time.

[gtudoran]

No problem,

Here is one: http://uk.farnell.com/productimages/farnell/standard/42423153.jpg
Another one: http://media.digikey.com/photos/TDK%20Photos/SL1215-101K1R5-PF.JPG
SMD version: http://rocky.digikey.com/weblib/Sumida/Web%20photos/CDRH127%20SERIES.jpg

Best regards,
Gabriel Tudoran
Analog Sound

I don't think so, i'm using only rod type inductors.

Best regards,
Gabriel Tudoran
Analog Sound

Could you give me an example of the unit you are suggesting to use?

I appreciate your time.

[guitarrob]

Thanks for the links.

[J0K3RX]

gtudoran (Gabriel )

Did you order your caps from Digikey? I am having a hell-o-va time sourcing all the caps for this thing... You wouldn't happen to have the digikey part numbers or the link to the website that you got them from... I am talking about the HV caps of course... Sorry to be a pain in the ass but I really want to build this mutha!

Thanks,
~Jim

[gtudoran]

Hey Jim,

The caps ar bought from a local store from Romania, i'm afraid i can't help you there.

Here is the last GTFO with a custom artwork:






Best regards,
Gabriel Tudoran
Analog Sound

gtudoran (Gabriel )

Did you order your caps from Digikey? I am having a hell-o-va time sourcing all the caps for this thing... You wouldn't happen to have the digikey part numbers or the link to the website that you got them from... I am talking about the HV caps of course... Sorry to be a pain in the ass but I really want to build this mutha!

Thanks,
~Jim

[guitarrob]

Did you put some LED's by the tube for that Blue glow?

[Minion]

Hi , I etched my board and I drilled the holes and then went to install some components and realized that the Layout that shows the parts placement does not match up with the PCB ........ The traces and parts placements in the PSU don"t match up and also in other places ......

I"m using the layout and pcb from post #66 ....... Is there an updated layout ??

Thanx

[gtudoran]

Hello Minion,

Ahhhh %#$%#, you have missed the post #83 ( http://dl.dropbox.com/u/15275178/blast%20from%20the%20past/BFTP_brd_ok.svg ) this is the last PCB for GTFO (i've made a mistake: i've overwritten the general instruction PDF but i didn't erase the PCB PDF) i think that it will be the best practive to redo the PCB or you can use the schematic to populate the board it will be a little bit more complicated but you will not loose it  really sorry for this mistake. I will also modify the #66 post to have all the latest data.

UPDATE! USE THIS! DO NOT USE POST No. 66:

General Instructions: http://dl.dropbox.com/u/15275178/blast%20from%20the%20past/GTFO.pdf
Bom: http://dl.dropbox.com/u/15275178/blast%20from%20the%20past/bom.txt
PCB SVGfile: http://dl.dropbox.com/u/15275178/blast%20from%20the%20past/BFTP_brd_new.svg

Thank you again for pointing that mistake, 1000x excuses for this.

Best regards,
Gabriel Tudoran
Analog Sound

PS: @guitarrob - yes there are 2 x superbright blue leds under the tubes just for design

Hi , I etched my board and I drilled the holes and then went to install some components and realized that the Layout that shows the parts placement does not match up with the PCB ........ The traces and parts placements in the PSU don"t match up and also in other places ......

I"m using the layout and pcb from post #66 ....... Is there an updated layout ??

Thanx

[J0K3RX]

Well, whenever my caps come in from Futurlec I will build this thing... I will probably have to re-order them from another company since after I ordered from Futurlec I read the reviews and almost everybody was unhappy with their service... Orders never filled, months to get parts, wrong parts etc... 

[PRR]

Power supply explanation:
http://www.dos4ever.com/flyback/flyback.html

Abour 1/3rd of the way down is the "same" circuit used by Gabriel, but the divider trimmer implemented as 1K+470 so the trim covers 90V-280V (Gabriel's simple 5K trim covers 26V to "infinity").

Also a good justification for using a "dumb" 555 instead of one of the many-many dedicated controllers.

[J0K3RX]

Still waiting for caps   I guess no gut shots huh, anybody build one yet?

[guitarrob]

Still waiting for caps   I guess no gut shots huh, anybody build one yet?

I am waiting for components also but I am building a few different designs, this design is at the top of my list though.

[Minion]

Still waiting for caps   I guess no gut shots huh, anybody build one yet?

Good luck with that , I for the life of my can not find caps that have a small enough footprint that will accomodate the PCB , I also found that my eyesight isn"t good enough to properly solder components on this PCB ...... All those Verticle resistors and the traces so close to each other just made it too difficult of a PCB for me to work with ....... I ended up just redesigning the whole PCB to allow for bigger foorprint caps and for more space between the traces and to allow for the resistors to lay flat , and too alow for terminal blocks and pots closer to the edge of the board ......

Cheers

[gtudoran]

Hey Jim, hope that i can do some pictures today - but the only unit that i have is the V1 (but that would not pe a problem i hope).

Regarding the small foot -print of the PCB - that was the whole thing about ths design to fit in a 1590BB type enclosure - ofcourse that you cand make it a little bigger as you have some space to spare inside the box .... speaking about seeing - last week i'be broke my glasses... $#@$@#$^%^ c'est la guerre

Best regards,
Gabriel Tudoran
Analog Sound

Still waiting for caps   I guess no gut shots huh, anybody build one yet?