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[MarshallJMP]

Usually marshall uses chinese tubes.

[rnolan]

(I think chaining 2 mp-1's will give alot of noise.) I agree, (and it's not good gain structure) but you could try it, the patching options I posted will work but the 2nd MP1 will boost both signal and residual/inherent noise (and add it's own noise), so will it sound good ? maybe ok depending on the patch settings ?

[rnolan]

Thank you for the insight, always appreciated.
Since the YJM is a 1959 plexi does anyone have any tube suggestions for the MP-1 that would come close to the YJM100 sound? Mullard short plates?
I cannot find specifically which preamp tubes are in it.
Sorry for hijacking this thread.

The Mullard short plates (or long plates) IMHO will work well.  Will it give you the tone you're chasing ?? I put some Boogie STRs (JJs) in my 1972 Marshall 50, they are ok, I think the Mullards would be better, but then I compare it (and it was my main (only) amp for many years) with either MP1/2 and they (ADAs') are sooooo much better.
The MP1/2 came with Chinese tubes, not sure where they sourced them from but they were good, lasted very well and sounded great (although I do prefer the Mullards now I have them, which are Russian)

[RobbHell]

There is nothing to gain but noise from running two mp1's into each other. Running two.with different patches into a stereo power amp,two channels a mixer or two.separate heads to blend both mp1s together..honeatly one mp1 is more than enough.

[trader144]

So... I chained 2 MP-1's together

Gained a lot of noise just as everyone said.
Also gained infinite sustain...in between a lot of noise.

One thing it did well was act as a really good pre-MP-1 distortion pedal, driving the inputs just a little more hot; but I didn't stick around long enough to keep testing it.

[trader144]

Why don't we hear more about mod1?

Too old school?

The JMP has a nice thick tuby clean sound. Is that the cathode follower?

[trader144]

.
So....just dreaming about the YJM100 head, it has 4 EC833's in the preamp....got me thinking....has anyone ever chained 2 MP1s together?
I might just try it.

Actually only one tube is used for the gain section,it has 2 channels (in parallel) so each channel has a half tube,then another half tube for extra gain,then a half tube for the tonestack (gain = 1x),1 tube for effects and one tube for the phase shifter.
So an MP-1 will have more preamp gain then YJM100 head.

Really interesting about the half tube. That explains a lot about the sound.
What if I disconnected the cathode pin 8 of V1b and V2b?
Looks like I would have half tubes and still have signal flow.
Too risky?

David

[MarshallJMP]

Wouldn't do that.

[rnolan]

12AX7s are twin triode, so you can use each triode independently (like my TLA Ivory 4 ch tube preamp, with only 2 12AX7s), or (I suspect) do different things with each of them.
My understanding of MP1 V1/V2 is it's a serial progression (e.g. V1 td1 > V1td2 >> V2 td1 > V2 td2 >>) (and you could apply (and they do is my understanding) different eq and gain characteristics at each stage ??) . Summary MP1 has 4 tube gain stages (and an initial SS stage).

[trader144]

Thank you for responding and I will leave it alone.
just wondering if I could shut down the 2nd gain stage easily on each tube (cutting power to cathode or filament) as it looks like the 1st stage will still flow.

[rnolan]

I'm sure you could all sorts of stuff, if you have a good reason (or just to play). why??

[trader144]

Because I want YJM 100 head performance for a fraction of the cost and the guys on this site have forgotten more about the MP-1 and amp circuitry than I will ever know!

[rnolan]

Hey David, pardon my ignorance but what's a YJM 100 ?
Cheers R

[El Chiguete]

Isnt that the Marshall Yngwie signature head?

[trader144]

Hi
Yes that is it
David