@ Steve

[MrDan666]

Just from the info i have found over the last few years.. Mark's Jose master can vary from amp to amp and its not always the typical 2 zeners back to back over the pot type layout either.

Also Dave Friedman said a while back that he had seen many original Jose modded Marshalls and he said Jose didnt do that zener/cathode type Master on all that many of the mods.

I have actually had 2 Cameron HG Jose's (1 had the Jose Master and 1 had a normal JCM800 master) and also i added the Jose Master (just like yours) to my JCM800 2204.

My conclusion was that i actually preferred the Cameron HG Jose which had the normal 800 master compared to the other two amps loaded with the Jose master! Thats not to say though that the Jose master wouldnt kill in the right amp!!

 

[Anonymous]

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.

Interesting, so that is a 4 diode layout... Definitely different. Well... no layout is final. I'll prolly end up changing lotsa stuff by the end of this project...

Steve

 

[MrDan666]

Interesting, so that is a 4 diode layout... Definitely different. Well... no layout is final. I'll prolly end up changing lotsa stuff by the end of this project...

Steve

Steve!

My Cameron HG Jose had almost the same Master volume.. 4 diodes, and a few caps and resistors!

 

[MrDan666]

The one without the Jose master is not a HG Jose. Its one of my other goofy mods and has no diodes.

Hey Mark! Cool bro, i didnt know that.. So what is the name of the mod in my amp? Lets be creative..

 

[Anonymous]

Hi Olaf!

Can you check out my power amp schem? I'm trying to stay close to a '69 Super Lead power section with the added Line Out, Density and LarMar PPIMV. Something doesn't seem exactly right, especially with the filter caps and maybe the bias supply. The bias supply is 95V from the PT. I looked at so many different Super Lead schems and they all look somewhat different... The 1 OHM resisitors on the tubes are for bias measurement of course... A second set of eyes is much appreciated! I know I could hook it up correctly from the layouts when building, however I want to maintain an accurate scem. I've included slightly updated versions of the rest of the schems as well for reference. Everything look ok?

Added the Density control to the layout as well:

 

[duesentrieb]

Hi Steve,

the Density/Depth is after the 47k/100k.
(I would) wire the Presence pot with a 25k and a 4k7 to ground and the cap before - no DC on the pot, no scratching noises.
The PPIMV is wrong. I'll find a schem for you. No ground connection IMO.
Filter caps of the bias supply are vice versa (+ to ground)
Put the 47k of the bias supply to ground and keep the pot between the 47k and the rest.
Do you have the specs of that PT? Are you sure it needs a bridge rectifier, so full wave or not?
You don't have enough filter caps for the input/power supply, Steve - after the choke . . .

Take the filtering from this, Steve:
http://www.thinlizzy.de/Bilder/SuperBass.gif

100µF means 2x50µF (one cap) parallel. Add the symmetrizing 56k (or 220k) - 2-3 Watters.

 

[duesentrieb]

R24 should be (if you really want to use 20k there - may be good for the Plexi stuff, but the high gain sound will be muddy) - anyway: use 2x10k - and 5 Watters/ceramics there. A lot of volts dropped there and due to the extra tube these things get nasty hot - so its better to use serial Rs.
The filter cap for the loop may be too low - if you run into motorboating use 22µF instead.

 

[Anonymous]

Hi Steve,

Mornin', Olaf!

the Density/Depth is after the 47k/100k.

I don't understand. So add a 100K in series with the 47K before the Density pot?

(I would) wire the Presence pot with a 25k and a 4k7 to ground and the cap before - no DC on the pot, no scratching noises.

Ok, understand...

The PPIMV is wrong. I'll find a schem for you. No ground connection IMO.

I got that directly from the wiring diagram provided here by Rockstah and verified by Larry:

LarMar PPIMV

Where did I go wrong in my schem?

Filter caps of the bias supply are vice versa (+ to ground)

Ok, that didn't look right... Thanks...

Put the 47k of the bias supply to ground and keep the pot between the 47k and the rest.

Gotcha!

Do you have the specs of that PT? Are you sure it needs a bridge rectifier, so full wave or not?

All I have is a wiring diagram. I'll call them today. On the wiring diagram, the filament (on the Primary side) is labeled "6.3V @ 7A". Does that help? What else do I need to get info on?

You don't have enough filter caps for the input/power supply, Steve - after the choke . . .

Yup, I forgot those... Dumb!

Take the filtering from this, Steve:
http://www.thinlizzy.de/Bilder/SuperBass.gif

Very helpful - I'll use this...

100µF means 2x50µF (one cap) parallel. Add the symmetrizing 56k (or 220k) - 2-3 Watters.

Ok, cool...

Thanks a million!

Steve

 

[Anonymous]

R24 should be (if you really want to use 20k there - may be good for the Plexi stuff, but the high gain sound will be muddy) - anyway: use 2x10k - and 5 Watters/ceramics there. A lot of volts dropped there and due to the extra tube these things get nasty hot - so its better to use serial Rs.

Ok - what would be a better value for high gain?

The filter cap for the loop may be too low - if you run into motorboating use 22µF instead.

I assume you are talking about the 10uF/450V cap (which should be electrolytic, right?), correct? - Right next to pin 6 of V3A...

Steve

 

[duesentrieb]

Awake already?

About the presence:

It's: presence pot --> 47k (or 100k) --> Depth --> OT sek. (8 Ohms or 16 as in yours - 16/47k and 8/100k should be the same)



About the PPIMV:
The PPIMV has no ground connection!

About the PT: 6.3/7A is fine - it will have some headroom, you need 7.2 Ampêres from it (4x1.5 + 4x0.3).
The info needed is the high voltage - is it 360 - 0 - 360 or 180 - 0 ? Is it center tapped?

Here's a PPIMV:

 

[duesentrieb]

R24 should be (if you really want to use 20k there - may be good for the Plexi stuff, but the high gain sound will be muddy) - anyway: use 2x10k - and 5 Watters/ceramics there. A lot of volts dropped there and due to the extra tube these things get nasty hot - so its better to use serial Rs.

Ok - what would be a better value for high gain?

The filter cap for the loop may be too low - if you run into motorboating use 22µF instead.

I assume you are talking about the 10uF/450V cap (which should be electrolytic, right?), correct? - Right next to pin 6 of V3A...

Steve

You need to try here. I like very small values like 1k5. Try 10k, 5k, 1k5 and decide then . . .

Yup. Just get two of those caps if you have motorboating

 

[duesentrieb]

btw - don't be too confused that this layout for the PPIMV is a bit different to Larry/Rockstahs. They just add 2M2 for safety and instead of a 250 there's a 500k - and then (with a 250k) no 220ks are needed. Still no ground, you see

 

[duesentrieb]

I'll be back here later today - need to take care of the kiddies, wife is on congress. CU

 

[Anonymous]

Awake already?

Yup! Ready to do battle with this design again all day! Off from work this week and trying to finish the design, including the footswitch!

About the presence:

It's: presence pot --> 47k --> Depth --> OT sek. (8 Ohms)

you may want to make the 47k switchable (to 100k) - 100k is more common in 100s (or isn't it) Just use 2x100k parallel.

Ok, I see. The Depth I used is directly from the Egnater Seminar Head - it is wired exactly the way I showed and it sounds cool - 50 watter though... Could I just leave it where it is in the circuit like the Seminar amp and just up the R to 100K?

About the PPIMV:
The PPIMV has no ground connection!

Ok, I'll look at the schem you provided. Did you look at the Rockstah layout I linked to?

About the PT: 6.3/7A is fine - it will have some headroom, you need 7.2 Ampêres from it (4x1.5 + 4x0.3).
The info needed is the high voltage - is it 360 - 0 - 360 or 180 - 0 ? Is it center tapped?

It is 186V - 0V - 186 V - center tapped.

Here's a PPIMV:

Cool!

Steve

 

[Anonymous]

btw - don't be too confused that this layout for the PPIMV is a bit different to Larry/Rockstahs. They just add 2M2 for safety and instead of a 250 there's a 500k - and then (with a 250k) no 220ks are needed. Still no ground, you see

Ok. Sounds good...

Steve

 

[Anonymous]

I'll be back here later today - need to take care of the kiddies, wife is on congress. CU

Ok, sounds good - by then I hope to have the footswitch completely schem'd as well. I hope I'm not bothering you too much. Your help and experience have been invaluable in moving this project forward! VERY much appreciated!

Steve

 

[duesentrieb]

The black wire in the pic/link is going to the bias-supply (normally the two 220ks are there).
Will have a look at your schem again . .

edit: the black wire

 

[Anonymous]

btw - don't be too confused that this layout for the PPIMV is a bit different to Larry/Rockstahs. They just add 2M2 for safety and instead of a 250 there's a 500k - and then (with a 250k) no 220ks are needed. Still no ground, you see

Without the 220Ks where does the return wire from the pot go?

Steve

 

[duesentrieb]

I'll be back here later today - need to take care of the kiddies, wife is on congress. CU

Ok, sounds good - by then I hope to have the footswitch completely schem'd as well. I hope I'm not bothering you too much. Your help and experience have been invaluable in moving this project forward! VERY much appreciated!

Steve

Not at all, Steve. My pleasure.

 

[duesentrieb]

btw - don't be too confused that this layout for the PPIMV is a bit different to Larry/Rockstahs. They just add 2M2 for safety and instead of a 250 there's a 500k - and then (with a 250k) no 220ks are needed. Still no ground, you see

Without the 220Ks where does the return wire from the pot go?

Steve

Do you see the error in the schem now?