Technical questions regarding 50 watt JMP

[beasleybodyshop]

Series. Adds variable up to 50k, right? the resistor mounts to one leg of the pot and then you wire the pot in where the resistor went.

The two white wires that go from lower left up to middle right on a 50 I have.

Err...I think I understand, I drew up what I think your trying to explain to me using the 1987 factory schem. It is attached. Is this right?

[Reeltarded]

yep

Jose

[Reeltarded]

hose b

[john l]

Careful OP Miles is sneaky bastard! It starts out with little tweaks on your main rig and before you know it you know it he has you building something that puts that thing on the shelf.

[beasleybodyshop]

Careful OP Miles is sneaky bastard! It starts out with little tweaks on your main rig and before you know it you know it he has you building something that puts that thing on the shelf.

Oh he is already talking me into diode clipping, variable slope, amongst other things!

I plan on re-doing my JMP build into a brand new chassis i built for a hiwatt type thing. My plan is to put to task the stock JMP circuit so I could familiarize myself with it intimately before I went to butchering it up.

[Reeltarded]

John has already been there.

The 1N914 diodes are what started me using clippers. I found them in my favorite transistor amp and used them just like it did. The transistors are my favorite, the 1N914s, then the red LED maybe, but they all sound very different. The LED is thumpy and driven but classic sounding, the transistors are dirty and extra thumpy, then the 914s are full dump and rage. Massive. Master wide effin open and gain on around 6-7.

The silicon 20v-5v diodes are nice and in the middle tone wise. Balls and crush.

When I found the Jose circuit it became the default way I insert diodes but that does complicate some effects rigs. There isn't a hotter signal available to split from in a standard Marshall thing, but in a 4 stage amp you can get as much dump as you want out of that third stage and make up the gain before the TS. Clippers sound like crap in an amp with few stages. Plexi nono.

[john l]

Shit Im too late...youre a goner.

All I can say is that 5 way rotary switches are wonderful things.

[Blindog]

When I found the Jose circuit it became the default way I insert diodes but that does complicate some effects rigs. There isn't a hotter signal available to split from in a standard Marshall thing, but in a 4 stage amp you can get as much dump as you want out of that third stage and make up the gain before the TS. Clippers sound like crap in an amp with few stages. Plexi nono.

Miles,

I was thinking about trying the Jose master in my 50W Plexi build, but to be clear, you're saying it won't work too well there?

Thanks!

Mark

[Reeltarded]

The diode component of the sound is gritty and the full drive of a normal 4 holer is sort of cleaner so when the clippers are in on a 4 holer it sounds a little blended cleaner with dirty whereas on an 800 with cascaded stages it sounds more together... does that make sense?

Ever use a blending distortion unit? Like that!

If you did the one-wire cascade on an input and added the clipping rig you'd have a do almost everything kind of amp, something to consider.

[martin manning]

Is this where I need to put a 50KL pot for that slope control mod you were describing to me? put it in parallel or series with the resistor?

Wot I would do is take out the 33k slope resistor and replace it with a 100k linear pot, but connect the outer lugs where the resistor was. Then, put a 47k resistor from one of the outer lugs to the wiper. That will give you a range of 32 to 100k ohms. Which outer lug you ask? I'd try it on both to see which way has better function, because the shunted pot's "taper" will be non-linear.

[beasleybodyshop]

John has already been there.

The 1N914 diodes are what started me using clippers. I found them in my favorite transistor amp and used them just like it did. The transistors are my favorite, the 1N914s, then the red LED maybe, but they all sound very different. The LED is thumpy and driven but classic sounding, the transistors are dirty and extra thumpy, then the 914s are full dump and rage. Massive. Master wide effin open and gain on around 6-7.

The silicon 20v-5v diodes are nice and in the middle tone wise. Balls and crush.

When I found the Jose circuit it became the default way I insert diodes but that does complicate some effects rigs. There isn't a hotter signal available to split from in a standard Marshall thing, but in a 4 stage amp you can get as much dump as you want out of that third stage and make up the gain before the TS. Clippers sound like crap in an amp with few stages. Plexi nono.

So...what your saying is in my plexi amp the clipping diodes arent going to cut it? maybe just go to one channel and use the other half of V1?

[Blindog]

The diode component of the sound is gritty and the full drive of a normal 4 holer is sort of cleaner so when the clippers are in on a 4 holer it sounds a little blended cleaner with dirty whereas on an 800 with cascaded stages it sounds more together... does that make sense?

Ever use a blending distortion unit? Like that!

If you did the one-wire cascade on an input and added the clipping rig you'd have a do almost everything kind of amp, something to consider.

I gotcha, thanks for clearing that up for me...I was about to head down the cascade path anyway, so now it's a done deal I'll make the short trip down to Savannah someday and maybe we can try to blow it up!

Mark

[beasleybodyshop]

Miles, for some reason I couldnt send you this photo to a PM

Im trying to wrap my head around your diode clipper circuit, but just using a DPDT switch with two pairs of clippers.

Is this right?

[Reeltarded]

Yes, that will work. the switch just needs input on center (off) and then either leg of on for diode selection.

If you hook it up and want it to go more clipping at the lowest setting on the 25k just swap the 10k for a smaller value.. or even none at all. That is thumpy too. Way thumpy but serious attenuation.

Experiment. Everything in that circuit can be tweaked to cause interesting sounds. creative bypassing on the other side of the switch to affect highs is the first place some might go.. oh hell I can't focus.

Yep!!