NAD: I love surprises. Marshall content

scottosan

scottosan

Well-known member
It seems to be a variation of the one wire mod. When I tried it out a few days ago, my translation app said it was a switch to combine the channels, so I thought it was just a switch instead of an external jumper cable. I also thought the MV on the back was PPIMV, so I set it like a would a jumpered NMV Marshall with a PPIMV and I didn’t like it right off the bat. Also there were no staff available and I couldn’t stick around. I went back today and asked one of the workers that I’ve bough quite a bit of stuff from, and he showed me how it worked and then I was able to conclude it was a one wire mod. I’ve always seen those on a push pull, so it didn’t click with me.


I was really on the fence. It sounded decent, but not my favorite. It dated to 1988, which would make it a 1988. That also meant pub mounted pots.

Ultimately, the $700 price tag :D was too much temptation. I was talking about this amp with @LPMojoGL and I asked him to send some turret boards that I left him and I was simply going to put in a new board.

Fast forward…. Plot twist……

I get it home dial in some good tones and then time to open it up. 💥 the hard work is already done! Now I just need to decide on a mod. Original drake transformers.





 
Nice score! They even outer-foil-oriented the caps. How is the noise floor? I usually stay away from carbon comp on those first two plates but it's usually not that bad.
 
SpiderWars said:
Nice score! They even outer-foil-oriented the caps. How is the noise floor? I usually stay away from carbon comp on those first two plates but it's usually not that bad.
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I saw the markings and was shocked someone actually outter foil oriented the caps but did so on a Bakelite board. Why on earth would you outer foil ground orient caps and then use fucking Bakelite which is known to be electrically leaky 😑
 
glpg80 said:
I saw the markings and was shocked someone actually outter foil oriented the caps but did so on a Bakelite board. Why on earth would you outer foil ground orient caps and then use fucking Bakelite which is known to be electrically leaky 😑
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It looks the same color but i thinks it’s G10 epoxy board.
 
You can't buy the parts to build an amp for $700 dollars let alone a Turret board converted 2203 to 1959 with original Drake transformers.....Good score there Scottosan....:2thumbsup:

The lead dress is a little messy but nothing worse than what Marshall put out over the years.............

So from a quick look it has a Pre PI/JCM800 single 1 Meg pot as the master volume, it works but does not allow the CF and PI to clip as well as a PPIMV but I am sure you will be modding the crap out of this anyway.......:rock:
 
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harddriver said:
You can't buy the parts to build an amp for $700 dollars let alone a Turret board converted 2203 to 1959 with original Drake transformers.....Good score there Scottosan....:2thumbsup:

The lead dress is a little messy but nothing worse than what Marshall put out over the years.............

So from a quick look it has a Pre PI/JCM800 single 1 Meg pot as the master volume, it works but does not allow the CF and PI to clip as well as a PPIMV but I am sure you will be modding the crap out of this anyway.......:rock:
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It’s not even 2203 spec. There’s some deviations than have me scratching my head, but easily fixable.
 
scottosan said:
It’s not even 2203 spec. There’s some deviations than have me scratching my head, but easily fixable.
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I know it's not a 2203 but I've seen that pre PI master used in some SL amps, the Tom Mitchell book used to use it for a master in 1959/1987 amps. It comes off the Treble pot to a single 1 Meg pot and then back into feeding the PI input grid cap. I had a pic of one of Curt Mitchell's Marshall's that ran it but somehow that pic was corrupted when I migrated my data over to my new computer.

You said the amp had a cascade switch so that's probably why they installed that master.
 
wow, score! I don't know Marshall prices very well, but aren't the actual vintage ones big money these days? 😲
 
harddriver said:
I know it's not a 2203 but I've seen that pre PI master used in some SL amps, the Tom Mitchell book used to use it for a master in 1959/1987 amps. It comes off the Treble pot to a single 1 Meg pot and then back into feeding the PI input grid cap. I had a pic of one of Curt Mitchell's Marshall's that ran it but somehow that pic was corrupted when I migrated my data over to my new computer
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I just cross-referenced it. It the Randy Rhoads preamp with a pre phase inverter MV
 
700?? Yep, take it and run.....

Had an 86 100w SL that Nick K made into a beast. Those 800 NMVs are underrated amps.
Congrats!!
 
scottosan said:
Fired it up for a few minutes. Pretty meaty tones. Both pre 1&2 on 7. MV on 2


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Sweet!
The loudest amp I ever heard was a JCM800 4 holer.
To be able to get that kind of crunch out of that amp at decent volumes in badass.

Perfect base to shape tone using guitar volume and pedals.
The power amp alone is worth the price.
 
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