Solo/"Volume Boost" for JMP??

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V-Killer

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Recently I picked up a minty '77 JMP. Looking for the obviously elusive single channel "volume" boost for solos. My chain: Turbotuner-Keeley ts9-Boss Ge7-Bad Horsie 2-Isp Decimator. I use the Eq for my main sound. I don't really want to use a 2nd eq pedal for another boost. I know that another "boost" type pedal may/will just add more gain...but is there any way to kick up the volume for solos? I do step on that wah halfway quite a bit and it surely cuts, but looking for an overall solution. Anyone try something like a Electro Harmonix line booster/MXR Micro Amp/ Keeley Katana????? Modding the amp is absolutely out of the question, it looks lilke it has been sitting in a roadcase for 34 years!
 
Simple... Creation Audio Lab Mk 4.23... most transparent clean boost you can buy.. I use one with my 79 JMP Friedman for lead work and love it. Suhr Koko Boost is also an amazing pedal. Cant go wrong with either.
 
I have a Koko I am trying to sell, does that Mk 4.23 boost the volume that much???
 
To truly boost the amp's output/volume for solos, you're going to need to have a foot-switchable 2nd Master added. Using OD/Boost pedals in the front end will simply drive the front end harder giving you more gain. It will not boost the amp's actual output/volume.
 
In my honest opinion.. The Mark 4.23 is plenty enuf volume boost for solos... no gain whatsoever.. If you turn it all the way up, the only gain you get is actually from the amps preamp tubes. I keep my 4.23 at no more than 10 o'clock and my solos are plenty loud and cutting in my live mix...and I have a 2nd guitarist who likes to be loud :lol: :LOL: You could crank it to noon or 1 and have MORE than enuf volume without any gain added at all. Check out their website and see for yourself... No color toning or sucking at all. Creation Audio Labs
 
suhrimmetal":1pwon39q said:
In my honest opinion.. The Mark 4.23 is plenty enuf volume boost for solos... no gain whatsoever.. If you turn it all the way up, the only gain you get is actually from the amps preamp tubes. I keep my 4.23 at no more than 10 o'clock and my solos are plenty loud and cutting in my live mix...and I have a 2nd guitarist who likes to be loud :lol: :LOL: You could crank it to noon or 1 and have MORE than enuf volume without any gain added at all. Check out their website and see for yourself... No color toning or sucking at all. Creation Audio Labs
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Well here's the issue with that concept. If the amp is breaking up any increase of the input signal will result in more gain not more volume. Basically the only way to make this happen is running the amp fairly clean having a OD and then a clean boost, this will compress the signal by square waving the shit out of it with the OD, and then you have some extra headroom where you can hit the front with the volume boost and actually have an increase in volume for solos.

So it really depends how you're using the JMP if you gonna have any luck boosting the volume.
Alternatively, you can always load it down into a power amp and get the volume difference happening before the power amp.
 
MrDan666":2i9zuhbz said:
To truly boost the amp's output/volume for solos, you're going to need to have a foot-switchable 2nd Master added. Using OD/Boost pedals in the front end will simply drive the front end harder giving you more gain. It will not boost the amp's actual output/volume.
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Yup.

Any level increase into the font end will increase gain and probably cut as well and not raise the volume, you need a second master.
 
yup boosts will just squash your signal more...keeping the volume down on your guitar for rhythm and bringing it up for leads will work or a second master volume
 
I play a Marshall Vintage Modern which pretty much behaves the same way as far as boosting. Using my Mk 4.23 doesn't cut it for solo volume boost, particularly with me being in a two guitar band.

My solution is a footswitchable dual volume attenuator made by Ho. Never have problems being heard on my solos anymore!
 
This is really going to depend on how hot you have the preamp set. In many cases where the preamp is well into overdrive, boosting the front end will not yield you any more volume--just more distortion (or worse, more mud). Basically what everyone has been saying here.

The typical and ideal solo boost is an actual volume boost occurring after the preamp.
 
get a good effects loop installed. buy a mxr micro amp and you'll get your volume boost with no coloring and one knob. ive been doing this for over 20 years on my JMPs and it works PERFECT. this is not a gain boost, pure volume!
 
I had this problem way back when I played a JMP. There are two solutions, mod it or sell it.
 
CECamps":2er8f8cc said:
This is really going to depend on how hot you have the preamp set. In many cases where the preamp is well into overdrive, boosting the front end will not yield you any more volume--just more distortion (or worse, more mud). Basically what everyone has been saying here.

The typical and ideal solo boost is an actual volume boost occurring after the preamp.
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bingo! hence the effects loop option
 
Try an Xotic EP booster. I use one in the effects loop of my Marsha and Cameron Aldrich '78 JMP and it works great!! (most likely don't have a loop in a '77 though). The EP booster works great in front as well, but the hidden secret is to put it in a loop IMO.
 
I know you don't want to get it modded but an effects loop would take care of the problem for you.

You might be able to use one of the speaker jack holes in the back to add a secondary master, or the low z input on the front if you don't use it.

Funny every amp I have/had with a secondary master for solo volume I never used it but I could see being in certain situations where it might come in handy.
 
I asked Phil X this exact question and he told me he uses an Ultimate Attenuator with a footswitch to go between 100% for solos and 70% for rhythm
 
Yes.. as I forgot to mention. I run my Mk 4.23 in my fx loop(hence I have a Friedman KS JMP)..therefore it comes after the pres and before the powertubes.. So there is no extra distortion/mud/or gain. That is probably not an option for the OP since he has a stock Marshall with no loop. In that case, I agree with Dan and the rest of the posters about a 2nd Master volume mod.


CECamps":1ccu2xw2 said:
This is really going to depend on how hot you have the preamp set. In many cases where the preamp is well into overdrive, boosting the front end will not yield you any more volume--just more distortion (or worse, more mud). Basically what everyone has been saying here.

The typical and ideal solo boost is an actual volume boost occurring after the preamp.
Click to expand...
 
Honestly I've dealt with this and guys trying to make it work with pedals in front in a two guitar situation and it never really works. As said, either fx loop or 2nd master mod (which you don't want to do) or maybe try one of those footswitchable attenuators, that would probably work just fine but I haven't used one. The only way its going to work stock as Ed said is if you run your amp CLEAN and then get all the gain from a pedal (with the level down) so that when you hit your clean boost it'll actually give you some volume. But that will likely make your rhythm sound pretty meh IMO compared to how you usually run it.
 
As mentioned you'll get minimal volume boost but more gain. In a single channel amp you need to be creative with volume minipulation. Back in the day only owning one amp, a JCM800 2203, I hit the front with a Boss SD-1 and sometimes a GE-7. The trick I did was use a volume pedal take was rolled off just a bit and would open it up along with SD-1 or GE7 for solo's. You could also do this with the guitars volume pot but I personally preferred the volume pedal.
 
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