'SPITFIRE' Metal 'n' Blues Pedal...

[J0K3RX]

All these cool mods/updates... anybody gonna post any sound clips?

[mr_deadmaxxx]

Can't say for sure about the noise since some is due to construction, but just looking at Dr. Boogie again and with all those resistors and gain stages the Spitfire is surely quieter and easier to build.  The basic design has been around awhile and is used in some of the most popular DIY boost overdrive/distortions.  

Check this out for some theory and Mu mod to SRPP for more gain.  Look for 7.7.01 article.  

http://www.geofex.com/

SRPP mod (for more gain and lower output impedance) and Hiss Reduction, if needed.    

http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1

Whoops, did I already suggest trying it at 18 volts with 2 - 9volt batteries.  No need to rebias.   

is that schematic verified already?

[WGTP]

The original schematic is, unless I have messed something up in the drawing, the mods should work.  Might start with the original and may not need mods. 

[WGTP]

For more mod ideas, check out the Okko Diablo at the other forum.  Also, the Catlinbread Formula 5.  Didn't realize there are so many dual Mu/Srpp designs around. 

Robert, I apologize for so many posts. 

[Maik]

pcb of this mod? 
http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1

[J0K3RX]

pcb of this mod? 
http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1

Sure, I would like a pcb with this mod! How long will it take you to draw? 

[deadastronaut]

@wgtp: don't apologise man!...its all good stuff!.... i take it thats an on/on/on for the cap switching!...

@maik:  go for it!...

anyone breaded it yet?...

[WGTP]

No, the switching is pick the 2 you like best, but it could be done.

Remember boys, use sockets in strategic locations.   

Sorry, I don't do pcb's, just breadboards and point to point.    

[mr_deadmaxxx]

since it's posted on the schematic, will a 2N5457 work the same as J201's in the same pcb board as spitfire v3? less gain?

thanks..

[deadastronaut]

yep, less gain though....socket em, and try a mix or just j201's....

[mr_deadmaxxx]

I read somewhere that a 2SK117 has much higher gain than J201? Different pin-outs though..

[Maik]

Sure, I would like a pcb with this mod! How long will it take you to draw? 

Don´t know. Never done it before 

[J0K3RX]

Sure, I would like a pcb with this mod! How long will it take you to draw? 

Don´t know. Never done it before 

No worries... I was just joking with ya. I may try to draw it up if I get some time.

[Maik]

No worries... I was just joking with ya. I may try to draw it up if I get some time.

[mpv]

Hi all,

I am planning to build Spitfire (probably the v1 with all switchable options).

Thinking of 2 separate Gain pots and they would be switchable using a footswitch (like I have in my Carl Martin PlexiTone).
Any suggestions where to put the switch in schematics?
Will there be any side-effects while operating the switch, like loud pops?

And what about 2 totally separate "channels" with Gain, Tone and Volume pots in the same box?
Is it easier to use 2 separate boards+pots and use a switch to select the outputs from them?

[deadastronaut]

hi mpv and welcome!...

i did this to a dr boogie, i had 2 vol/ 2 gains...
heres how i wired that up...it would be pretty much the same...look at the gain pot switching..
http://www.aronnelson.com/gallery/main.php/v/chickpea/twinboogie+wiring+guide.png.html?g2_imageViewsIndex=1
http://www.aronnelson.com/gallery/main.php/v/chickpea/pedal+builds/P240511_12_54.jpg.html


might i suggest just using a volume pedal with adjustable max/min vol pot.....it will then back off the drive or max it out.....thats what i do and it works fine...

this pedal cleans up really well just with guitar volume backed off....then full on distortion with guitar volume up...just my 2p...

[mpv]

heres how i wired that up...it would be pretty much the same...look at the gain pot switching..
http://www.aronnelson.com/gallery/main.php/v/chickpea/twinboogie+wiring+guide.png.html?g2_imageViewsIndex=1
http://www.aronnelson.com/gallery/main.php/v/chickpea/pedal+builds/P240511_12_54.jpg.html

Thanks for a fast response!

I will check those out when starting actually building the board...

Off the topic, does anyone know good links for infos on etching aluminium enclosures?
Those examples I found look really nice but I have never done it...

[Maik]

http://www.scribd.com/doc/24250149/Making-a-Multicolor-Etching
But I think it is easier with HCL 30%, H2O2 30% and water mixed 1:1:1, but remember to fill in the water first.  No need to make it warm. But use safetyglasses and rubber gloves.

[deadastronaut]

just a quicky note about etching, i etched 2 boxes yesterday...the eddystone came out fine...but those rounded ones from the usa/hammond, didn't etch at all..diifferent blend of metals.....be warned.

[Maik]

therefor I use HCL and H2O2...