@ Steve

[Anonymous]

Steve,

Are you sure that the Jose Master is correct? BTW--I am on Metro as Guitar Adjuster. Reason I ask is I have some photo's of a Jose master off a Cameron modded 2204 that does not look like that at all.......

Allen

I've talked with Mark about this Master (after I've built that into an amp looong ago). So I guess its corrct, but a link to the pic(s) would be nice to verfy.
The way Steve has wired his up definitely works.

Hey Allen - yeah, I'd like to see the picture as well. Where'd ya go?

Steve

 

[duesentrieb]

I'm not strange or crazy, just nuts

 

[Anonymous]

I think this is it (with final changes based on your last corrections)! Now I'll work on a quick schem page for the parallel 5 pin midi switching and a footswitch schem. Final (I think!) preamp and EFX Loop schems (at least until I get it built and start tweaking values

Steve

 

[duesentrieb]

Hi Steve,

I will have a close look tomorrow - its late over here (and busy ).

About the PTP: you can get pretty wide Keystone Turretboards (wider than a normal Marshall PTP). I will post a pic of mine a bit later. Thats just two straight lines of turrets. "Personalization" (for the PI "Vs" and such can be made with eyeletts (a la Larry Amps) and a 3mm drill. That makes orientation of the relays on the board and the additional parts (which are not that numerous) easy. Just an idea . . .

Olaf

 

[Anonymous]

Hi Steve,

I will have a close look tomorrow - its late over here (and busy ).

About the PTP: you can get pretty wide Keystone Turretboards (wider than a normal Marshall PTP). I will post a pic of mine a bit later. Thats just two straight lines of turrets. "Personalization" (for the PI "Vs" and such can be made with eyeletts (a la Larry Amps) and a 3mm drill. That makes orientation of the relays on the board and the additional parts (which are not that numerous) easy. Just an idea . . .

Olaf

Sounds like a good idea, Olaf! Would love to see pics... Thanks for checking my schem again, you've been a tremendous help. I'm sure I'll have some questions on the footwitch schem as well although it seems pretty simple...

Steve

 

[duesentrieb]

My pleasure Steve.

Here's a Keystone stock board (Mouser)

 

[duesentrieb]

And here's one "individualized" - you can see that I've added some eyeletts here and there for the relays and also for some other stuff . . . just drill a 3mm hole and kick the eyelett with a hammer in. Will last forever - as I've said: Larry amps are built like this (cleaner than mine of course - finest craftmanship - for me this is perfect - buying finished turretboard and then individualize - thats faster than layouting a whole new board (I did that several times before and it a PITA)

Just some ideas . . . a clean and full indiv. board is definitely cooler though (but ho knows, maybe you are already addicted )

 

[Anonymous]

This is all very cool, Olaf. I was getting a little nutty... Thought I'd do a complete component layout in photoshop and them buy the Weber board metal template and have a plexiboard guide of my layout built and hand drill my boards. Maybe this is a better idea, especially for the prototype...

Steve

 

[Anonymous]

My pleasure Steve.

Here's a Keystone stock board (Mouser)

BTW - the biggest board I could find at Mouser was a little over 13 inches long and 3 inches wide. I think a standard Marshall PTP board is 3.125" wide, no? I think mine will have to be longer than 13 inches to fit all this as well.

Steve

 

[duesentrieb]

Sometimes its cool to have some options, Steve. How can I explain that . . . well, once you have a layouted board - even with say Rockstah, Larry himself and me giving you some kind of absolution - you may run into probs with hum, grounding or whatever. So you are absolutely correct with your prototype statement.

Once you are retired - or everybody who couldn't rebuild your schem (just looking at the # of views here ) and wants one from you - you can still make a super clean board for series production or just for aestaetics (sp?).

Btw: decrease your input resistors (after you've tried your "Mojave" 33ks of course) At high gain with the amp running idle 33k is producing a lot of (annoying) hiss.

I will tell you (PM, not here) what to do then if it should hiss too much for your taste.

Inches: its a bit smaller, but Marshalls are wasting space like crazy. And you could make one board for rectification and bias (a smaller) and one for the preamp.

Here's a pic to give you the idea (yours won't be that huge of course)

 

[duesentrieb]

Some more ideas .. .

I wire the grounding on the bottom of the board. Grounding for input and the whole preamp. Then, the whole bus is going to the star (don't use anything else than a star for yours). Grond the input jack at the V1A cathode ground (turret). Ground the gain pot at the cath of V1B, and so on. Ground the pot's ground lug at the coreesponding cathode. Don't run a ground wire à la Marshall on the back of the pots.
Ground the PI (presence etc) seperately - means run a sep. wire to the star.
Don't ground the switching ground at the star, but elsewhere.
Ground the filter caps seperately.
If you should have a bridge rect. ground that at the minus of the first filter cap and run from there to the star.
You can ground the minus of the relay supply cap at the star of course.
Ground the speaker "0" at the powertubes. Run a wire off 8/1 to the star (not directly to the chassis).
Ground the loop and its filter cap seperately - to the star.

Well, thats what in my mind about grounding a higher gained amp right now (maybe more to come).

 

[Anonymous]

Sometimes its cool to have some options, Steve. How can I explain that . . . well, once you have a layouted board - even with say Rockstah, Larry himself and me giving you some kind of absolution - you may run into probs with hum, grounding or whatever. So you are absolutely correct with your prototype statement.

Yeah, for sure for the prototype. I'll try a prebuilt board - thanks for the idea

Once you are retired - or everybody who couldn't rebuild your schem (just looking at the # of views here ) and wants one from you - you can still make a super clean board for series production or just for aestaetics (sp?).

Well... as far as I can tell there are no secrets under the sun as far as amp building goes, so if anyone wants to take these schems and build the amp, I say go for it! I actually posted the schems over at Metro as well for anyone interested (gave you credit for all your help, of course!). The way I figure it there are plenty of people who play guitar who don't want to build their own amp and might be interested in one of these, however, I'm currently not looking to support myself as an amp builder. I think you need to be independently wealthy first - then it can be fun!

Btw: decrease your input resistors (after you've tried your "Mojave" 33ks of course) At high gain with the amp running idle 33k is producing a lot of (annoying) hiss.

The only 33k resistor I see in my schem is in the tone stack. Are you talking about the 68K resistors going from the input jacks to V1A?

I will tell you (PM, not here) what to do then if it should hiss too much for your taste.

You can bet I'll be asking you about that!

Inches: its a bit smaller, but Marshalls are wasting space like crazy. And you could make one board for rectification and bias (a smaller) and one for the preamp.

Gotcha!

Here's a pic to give you the idea (yours won't be that huge of course)

Looks great!

Steve

 

[Anonymous]

Some more ideas .. .

I wire the grounding on the bottom of the board. Grounding for input and the whole preamp. Then, the whole bus is going to the star (don't use anything else than a star for yours). Grond the input jack at the V1A cathode ground (turret). Ground the gain pot at the cath of V1B, and so on. Ground the pot's ground lug at the coreesponding cathode. Don't run a ground wire à la Marshall on the back of the pots.
Ground the PI (presence etc) seperately - means run a sep. wire to the star.
Don't ground the switching ground at the star, but elsewhere.
Ground the filter caps seperately.
If you should have a bridge rect. ground that at the minus of the first filter cap and run from there to the star.
You can ground the minus of the relay supply cap at the star of course.
Ground the speaker "0" at the powertubes. Run a wire off 8/1 to the star (not directly to the chassis).
Ground the loop and its filter cap seperately - to the star.

Well, thats what in my mind about grounding a higher gained amp right now (maybe more to come).

Awesome stuff man!

Steve

 

[duesentrieb]

Oh, I still had the Mojave in mind with its 33k input-Rs. 68k of course. (way too high )
The most famous mod for the SLO: replace the 68k with something smaller and "this and that"

 

[Anonymous]

Oh, I still had the Mojave in mind with its 33k input-Rs. 68k of course. (way too high )
The most famous mod for the SLO: replace the 68k with something smaller and "this and that"

Can you PM me on the something smaller and "this and that"?

Steve

 

[duesentrieb]

Are you sure? You know, the purists among the Marshaholics would freak if they had to change the holy 68k

Will do, Steve.

 

[Riddick]

Sorry Guys, went out of town for a High School Football game.....

 

[Riddick]

My pleasure Steve.

Here's a Keystone stock board (Mouser)

BTW - the biggest board I could find at Mouser was a little over 13 inches long and 3 inches wide. I think a standard Marshall PTP board is 3.125" wide, no? I think mine will have to be longer than 13 inches to fit all this as well.

Steve

Steve,

This place has turret boards in ALL dimensions, colors, also turrets, etc.

http://www.turretboards.com/

Also, Radio Shack has 5mm LED mounting rings like the metal one you posted and they also make a simple flush mount one in black that the LED snaps into. I just bought some, I think they are $1.49 for 4 or 5 in a package. The part # is 276-079

Allen

 

[Anonymous]

My pleasure Steve.

Here's a Keystone stock board (Mouser)

BTW - the biggest board I could find at Mouser was a little over 13 inches long and 3 inches wide. I think a standard Marshall PTP board is 3.125" wide, no? I think mine will have to be longer than 13 inches to fit all this as well.

Steve

Steve,

This place has turret boards in ALL dimensions, colors, also turrets, etc.

http://www.turretboards.com/

Also, Radio Shack has 5mm LED mounting rings like the metal one you posted and they also make a simple flush mount one in black that the LED snaps into. I just bought some, I think they are $1.49 for 4 or 5 in a package. The part # is 276-079

Allen

Allen,

Hey thanks for the scoop on this stuff. Yeah, I've been dealing with turretboards.com already for other parts - I'll check out their pre-built boards.

Thanks for the master pics as well... BTW - are you sure that master is a jose master? Where are the Zener diodes? All I see are caps and resistors unless I just can't see them...

Steve

 

[Riddick]

Steve,

Those rainbow looking things are Radio Shack diodes not resistors, the green caps are also from Radio Shack. I am not 100% sure it his "jose" mv, it was a one off built for someone that a friend bought. It was suppose to be a VHI type amp and it did that in spades. It was sold a while back on the gear page by my friend.