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Lets get Technical > All Things Tube All about preamp and power amp Tubes.

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 1 
 on: Time Format 
Started by Luke Gibson - Last post by rnolan
 :thumb-up: :whoohoo!:

 2 
 on: Time Format 
Started by Systematic Chaos - Last post by rnolan
Hey RG, the line input jack is balanced if you want to use it, just make a lead XLR female to stereo jack (wiring is on page 10 of the manual), or buy a XLR > Stereo jack adapter, they're not expensive.  You can plug into the mic input, it's just not ideal gain structure pumping a line level signal into a mic input (kind of going backwards from a gain point of view), sure you can turn the Rockmaster output down and the mic channel gain right down and make it work, but just use a XLR > st Jack adapter and use the line input, keeps it balanced and much better (correct) gain structure.
The MP1 Fx send always has a signal (comes just after the tube > Eq section but before the chorus).  Taking a feed from there won't break the serial chain, the loop on/off in the MP1 patch toggles the Fx return jack path. You can do the same with the Rockmaster but use a Y lead so the dry signal is fed back to the return and also to the Fx input so you don't break the serial chain.
You'd only need a cab sim if you are going direct to a desk and full range speakers and you want to use the same patch as you use with cabs.  A patch adjusted for cabs will have/need much more tops than a patch tweaked for full range as the live cabs are 12" speakers and don't (usually) have a horn tweeter so they (the speakers) roll off the top end, thus we boost the tops so it sounds right.
(balanced output provides 600ohm, transformer balanced signal to be used as "direct" patch into mixing consoles, tape recorders, etc.  The signal at this point has been frequency compensated for low noise operation.)I read this as they have reduced the tops to compensate, which is the main thing all cab sims do and also what the MP1 does on its headphone out for the same reason.  (BTW you can use the MP1 headphone out direct to a desk etc for recording).  So using the line out XLR and going to cabs (as is what you want) you'll have less tops and have to compensate in your patch (or IIRC correctly you use an Eq before the amp ?).  If you just use the Rockmaster L/R outs into ch 2/3, Y lead to split off the Fx send and Fx L/R outs into ch 4/5, you now have parallel Fx and maintain stereo.
Anyway, try it all these different ways and see/hear what sounds best for you.

 3 
 on: Time Format 
Started by mqqse - Last post by mqqse
I really want a Voodoo Modded JMP-1, I saw Def Leppard last year and Vivian’s tone out front was fantastic. I believe he’s still using the Voodoo Modded JMP-1 with the Axe-FX for effects....  Awesome!!!

I was lucky to find mine for the price I paid.   It’s hard to find with any Voodoo mods now that the service isn’t offered anymore.

 4 
 on: Time Format 
Started by rabidgerry - Last post by bunkyloo
And Winger IV

 5 
 on: Time Format 
Started by rabidgerry - Last post by bunkyloo
Ratt Reach for the sky
Queensryche rage for order

 6 
 on: Time Format 
Started by mqqse - Last post by Luke Gibson
If it were me, I'd keep the MP1 with the B200s for posterity, unless it sounded particularly better with a different amp.

Tone before fashion ;)

I really want a Voodoo Modded JMP-1, I saw Def Leppard last year and Vivian’s tone out front was fantastic. I believe he’s still using the Voodoo Modded JMP-1 with the Axe-FX for effects....  Awesome!!!

 7 
 on: Time Format 
Started by Luke Gibson - Last post by Luke Gibson
I bought another MP-1 older unit with Rev D board V1.38  looks to be made around 1988.  Still digging my original unit but now feels nice to have a spare.... 

 8 
 on: Time Format 
Started by Systematic Chaos - Last post by MarshallJMP
The MP-1 has a serial loop. The MP-2 has a parallel loop.

 9 
 on: Time Format 
Started by Systematic Chaos - Last post by rabidgerry
Well when I said designed for a mixing desk I was simply reiterating what the manual states
Quote
balanced output provides 600ohm, transformer balanced signal to be used as "direct" patch into mixing consoles, tape recorders, etc.  The signal at this point has been frequency compensated for low noise operation.

To me it would be easier to plug the xlr into the xlr on the 502 since the connection is the same.  And I figured mixer input tolerances are a lot more forgiving than older equipment, well at least that's what I have been told.  But regardless of that, I'm fine putting a balanced output into a balanced input.  I have already tried this xlr out into an xlr input on my multitrack and there was no issue with levels as I expected.

Not sure why you think I need a cab sim either, I'm using guitar cabs.  A speaker sim would be a hindrance to my setup.

The Mp1 loop is parallel then?  If I have a send come from the rockmaster the signal needs to return other wise I'd get no output as they are series.  So I wouldn't use a send to have a signal for dry sent to the mixer.

 10 
 on: Time Format 
Started by Systematic Chaos - Last post by rnolan
Hey RG, I assumed (since you said the XLR out is designed to plug into a desk) that it would be cab simmed as otherwise you wouldn't want to plug it into a desk unless you change the patch(s) to have less tops than you need for going into 12" speakers.  The pix I saw of it says balanced line out, so as you say not cab simmed.  Now you are plugging a line level signal into a mic input so be careful with levels.  It would be better to plug it into ch1 line input (as it's designed for it).
MP1 is easy, MP1  A/B outs > ch 2/3, MP1 Fx send to Fx L mono in, Fx L/R out to ch 4/5, main out > amp > cabs.  You could also plug the Rocmaster in this way and it would be how I'd do it.

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