LHX2 Mashall Perfboard Layout

[jishnudg]

Something I've wanted to sink my teeth into for a long time...made an LXH2 Marshall layout, with a modded LPB upfront (which I may remove or make switchable eventually)...I've also included some diodes at the input of the LXH2 to make it more "booster friendly" (something I saw in an ROG pedal)...I was wondering if forum members could just take a look at the layout, to iron out possible errors before I make this (hopefully this weekend)...also another query I have is regarding the last opamp (I've used one half of a TL072) - - is that bipolar supply as well?

Layout -

https://drive.google.com/file/d/0BwMVia471c4SQUYtV3BNZHdlclk/edit?usp=sharing

[jishnudg]

Also, I'm not sure how to wire the tonestack...where do the 2nd lugs connect to?

[samhay]

Help us help you:

If you post a schematic (or link to one), then you might find more takers.
Also, some of the pots in your layout don't seem to be labelled...

[jishnudg]

Sorry, I should have included this -

Schematic -

http://home.netcarrier.com/lxh2/web/marshprb.gif

[jishnudg]

No power supply has been mentioned in the .gif attached... I'm guessing the supply to all the opamps is bipolar +- 9V, but can this be verified? Thanks.

[samhay]

Looks like a bipolar supply as the signal is referened to ground.
I think you have too many pots in your layout - there should be 1 dual-gang gain pot, 1 (presence?), 3 in the tone section, and 1 level pot.

[duck_arse]

looks bipolar because there is no V+ splitter. look at this page for pot wirings.

http://www.runoffgroove.com/uno.html

[edit: ] your fifth and sixth pots should be a single dual pot. you've got a lot of doubled and series make-up-values there.

[Davelectro]

IIRC the circuit was designed for a +/-12V supply.

Search for the LHX website. I think it's still available somewhere.

[jishnudg]

Thanks, guys! I'm wiring this one tonight - - guess I'll try bipolar 9v and 12v and go with whatever sounds better let's hope this works, so we have a verified perf layout of this thing