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Unread 01-08-2012, 12:00 AM   #1 (permalink)
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Modding a Plexi. Advice Please.

I want to get a 1959sl or a 1987 and mod it. I'm relatively new to amp mods so bare with me. I'd like to install a MV and increase the gain into VH, and Randy Rhoads territory. I'd like to keep the low input channel and mod the lead channel. On the lead channel I'd like to be able to go from ACDC to RR and maybe even a bit hotter. I would just keep the rhythm channel stock. Are these mods possible? Could you recommend some mods that would do this? Thanks in Advance!
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Unread 01-08-2012, 07:31 AM   #2 (permalink)
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Re: Modding a Plexi. Advice Please.

Adding another gain stage maybe? Get the amp first and see how you go, maybe just boosting it with a pedal is the way to go?
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Unread 01-08-2012, 09:13 AM   #3 (permalink)
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Re: Modding a Plexi. Advice Please.

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Originally Posted by Goosey View Post
Get the amp first and see how you go, maybe just boosting it with a pedal is the way to go?
I agree. You seem to have a sound in your head, so before you start trying to reinvent the wheel, see what some pedals will do. Then maybe add the MV. Unless you just want to "mod an amp"; in that case your finished product is a moving target..

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Unread 01-08-2012, 12:18 PM   #4 (permalink)
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Re: Modding a Plexi. Advice Please.

I actually had the chance to try out my buddy's 1987x. It sounded awesome but there wasn't enough gain for me. It sounded ok with a TS but I'd like to be able to get those VH/RR tones from the amp itself. Would Adding a gain stage make a huge difference?
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Unread 01-08-2012, 02:08 PM   #5 (permalink)
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Re: Modding a Plexi. Advice Please.

but you have a 2204?, RR played a cascaded 1959, the same amount of gain you'll get through a 2203. He just cranked he's more.
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Unread 01-09-2012, 03:15 PM   #6 (permalink)
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Re: Modding a Plexi. Advice Please.

adding just one gain stage, WILL make a huge difference imo.
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Unread 01-09-2012, 03:32 PM   #7 (permalink)
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Re: Modding a Plexi. Advice Please.

Before you buy, you may want to try out a Vintage Modern, it is almost exactly what you describe. I first bought a VM because I realized I'd have to add all sorts of mods to a 1987 or 1959 to get what I wanted (gain boost, master volume, gain switching, etc). The VM had all that stock. I could not be happier with the VM.
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Unread 01-09-2012, 03:33 PM   #8 (permalink)
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Re: Modding a Plexi. Advice Please.

I generally tell people never to mod until they've had time to learn to live with an amplifier first off, so as they can really be sure of what they want to change.

And only change one thing at a time, and again, learn to live with the changes before moving on to the next.

Many people have been in a hurry to destroy perfectly good sounding amps.

Never buy an amp your unfamiliar with, with the idea that your going to mod it in exactly one direction, because things often turn out different. Sometimes less is more, and these things occasionally cause revelations that cause you to rethink everything, even the way you play. I've seen it happen many a time.
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Unread 01-09-2012, 03:47 PM   #9 (permalink)
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Re: Modding a Plexi. Advice Please.

I've been down this road recently and was given a solution that works perfectly WITHOUT modding either my 72 SL or my 74 1987. Was originally going to mod it from the same guys who do Green Days/Sum 41's amps, crunch mod - Martin Golub and Doug Aldrich's high gain mod (this mod adds a fourth preamp tube) here. L.A. Sound Design

BUT instead realizing I love the natural sound of the amp as it is and what I really needed was both clean and crunch and even into high gain. Dave over at LA Sound Design ended up selling me a pedal they distribute that worked PERFECTLY for what I need and I tell you it not only does not change the character of the tube amp but it replicated both the Green Day AC/DC crunch and higher gain lead tones. It was as if I had modded the amp. Sounds awesome at very low volumes, cranked stage volume or through an attenuator.

Take a look. Welcome to XAct Tone Solutions

I would highly recommend this for any early or late Marshall non master volume amp.
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Unread 01-09-2012, 03:59 PM   #10 (permalink)
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Re: Modding a Plexi. Advice Please.

check out the lar/mar thread, the guys have been discussing the 'one wire mod', which i have just learned, is the cascaded V1 mod.

when i was scrapping my JTM45 clone together, since im only using one input, i cascaded V1....to me, it was too much, i put it back stock.

but im sure with a little planning, you could install that mod on a switch, which i still might do myself, since ive got a gainstage sitting and doing nothing right now. id like to be able to install it to operate with a footswitch. but i havent put much thought into how to do that yet.

seems like it should be doable w/o a lot of fuss though...at a minimum, with a manual switch mounted on the chassis.
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Unread 01-09-2012, 05:13 PM   #11 (permalink)
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Re: Modding a Plexi. Advice Please.

You could always purchase an already modded one. I believe modded ones go for less or the same price as regular ones, and you could just buy it with the mod pre-installed. I agree with Ken, though. You should try some pedals on your friend's amp or at guitar center. Also, you will need to crank it to get a good distorted tone. The reason Randy and Eddie's tones were so good was because their amps were cranked, so you'll have to crank it somewhat to get near their tones
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Unread 01-09-2012, 05:24 PM   #12 (permalink)
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Re: Modding a Plexi. Advice Please.

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The reason Randy and Eddie's tones were so good was because their amps were cranked, so you'll have to crank it somewhat to get near their tones
not with the PPIMV mod. it kicks ass. turns a roaring marshall into an amazing home recording amp. just gotta get a moderate volume to push the speaks and get some nice hot levels.
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Unread 01-10-2012, 03:19 AM   #13 (permalink)
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Re: Modding a Plexi. Advice Please.

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Originally Posted by scat7s View Post
check out the lar/mar thread, the guys have been discussing the 'one wire mod', which i have just learned, is the cascaded V1 mod.

when i was scrapping my JTM45 clone together, since im only using one input, i cascaded V1....to me, it was too much, i put it back stock.
you should have posted a soundclip before you went back to stock, just to show how much gain is actually available from the standard JTM 45/1987/1959 platform, with the one wire mod and the PPIMV.

and just how right they got the design the first time, without knowing it.



But at the end of the day to get VH tone you need to crank it and overdrive the output tubes.


if any members here need help to do the one wire mod, easy steps. pm me.
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Unread 01-10-2012, 01:16 PM   #14 (permalink)
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Re: Modding a Plexi. Advice Please.

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Originally Posted by Strateuphoria View Post
you should have posted a soundclip before you went back to stock, just to show how much gain is actually available from the standard JTM 45/1987/1959 platform, with the one wire mod and the PPIMV.

and just how right they got the design the first time, without knowing it.



But at the end of the day to get VH tone you need to crank it and overdrive the output tubes.


if any members here need help to do the one wire mod, easy steps. pm me.

unfortunately, i dont have an easy computer recording setup. i have to record to tape, then burn it to cd, then dump it into my computer. not a dealbreaker, but im usually too lazy to bother with it...im still getting used to the extra gain in that 45 with a typical non-cascaded layout...i was playing much cleaner tones before, but the JTM45 just doesnt sound great to my ears on the cleaner side, it sounds best roaring.

i have to change my whole approach to playing thru this monster. its fun though. i would imagine i will eventually do the cascade again, but put it on a switch.

do you happen to know off the top of your head, if the cascade can be installed to operate on a ftswitch w/o having to use a relay? in some sort of short to gnd type of arrangement?
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Unread 01-12-2012, 11:56 AM   #15 (permalink)
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Re: Modding a Plexi. Advice Please.

What rjtm said it would be cheaper to buy one already modded. It would be cheaper. Goodluck.
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Unread 01-12-2012, 01:33 PM   #16 (permalink)
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Re: Modding a Plexi. Advice Please.

they do make amps for that
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Unread 01-12-2012, 02:17 PM   #17 (permalink)
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Re: Modding a Plexi. Advice Please.

(foot)switchable 1 wire mod, lar/mar ppimv, zero loss FX loop, switchable bright cap. Heaven.
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