JMP 2203 build

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iff
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JMP 2203 build

Post by iff »

I've been planning this one for a while since I knew I had time off coming up, which really worked out because half of the stuff is out of stock now. :lol: It's the Metro 100W MV kit from ValveStorm and I'm having a headshell built by Sourmash with the extra rounded corners on the front cutout, but that hasn't made it here yet since I left it a bit late. The transformers are Heyboer from AmpPartsDirect. I actually started last week so I'm done a bunch of it, but here are some progress pics anyway. The full album is here if anyone's interested and I'll be adding photos as I go: https://imgur.com/a/W4GLG8d

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Last edited by iff on Mon Sep 13, 2021 11:18 pm, edited 1 time in total.
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Devin
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Re: JMP 2203 build

Post by Devin »

Sensual :love:
Whatnow2012 wrote:try humberck piskup is bettor for metal than singlecpoil for blues


Unstrung wrote:ya it am bast


Rampage wrote:When life hands you distortion, fuck everything else.

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itchyfingers
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Re: JMP 2203 build

Post by itchyfingers »

Very tidy! Keep those pics coming...
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GuitarBilly
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Re: JMP 2203 build

Post by GuitarBilly »

Damn!! Looking good!!! Are you going to keep it stock or hot-rod it a bit?

And I can attest to the quality of the Sourmash headshells, that's what I had on my Ceriatone 2204 (which was actually a kit that guys at SM put together).
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iff
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Re: JMP 2203 build

Post by iff »

GuitarBilly wrote:Damn!! Looking good!!! Are you going to keep it stock or hot-rod it a bit?

And I can attest to the quality of the Sourmash headshells, that's what I had on my Ceriatone 2204 (which was actually a kit that guys at SM put together).


No plans yet, but I'm sure I'll play with it a bit once I have it up and running. Not really hotrodding, but I do plan on switching to 6550s at some point.
iff
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Re: JMP 2203 build

Post by iff »

Oh yeah, I also picked up a used HotMod recently so that'll hopefully satisfy any hotrodding itch at least short term
iff
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Re: JMP 2203 build

Post by iff »

The chassis wiring is pretty much done and I've installed the bus wire on the board. The instructions are missing the page with the ~30 board-to-chassis wire lengths so I'm spending some time figuring those all out to post on the Metro forum for anyone who builds this in the future.

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iff
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Re: JMP 2203 build

Post by iff »

I've got the board wired and in the chassis now, with the preamp sockets hooked up. I have to take a break for a few days so I'll be finishing next week. The headshell is scheduled to be delivered next week so it'll be right on time!

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iff
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Re: JMP 2203 build

Post by iff »

Hopefully done wiring! I had to cut the testing short last night, but so far everything is all good. I'm just scared to screw up drilling the headshell now. :lol:

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itchyfingers
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Re: JMP 2203 build

Post by itchyfingers »

Again, looking tidy AF man. Good luck on the headshell! :pray:
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TurboPablo
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Re: JMP 2203 build

Post by TurboPablo »

Damn that is gorgeous. Great work!
iff
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Re: JMP 2203 build

Post by iff »

All the voltages are as expected except for V3, where they're way too high. Pin 1 and 6 seem reasonable based on other voltages that I'm measuring, but 2/3/7/8 seem totally off. I've tried swapping the tube and it made no difference. Not sure what's going on here...

Measured (Expected):
Pin 1 - 276 (218)
Pin 2 - 98 (28)
Pin 3 - 151 (42)
Pin 6 - 270 (214)
Pin 7 - 105 (28)
Pin 8 - 151 (42)
skybluegary
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Re: JMP 2203 build

Post by skybluegary »

Very nice :love:
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Marc G
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Re: JMP 2203 build

Post by Marc G »

damn that's coming together really nicely....
iff
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Re: JMP 2203 build

Post by iff »

Someone on another forum pointed out that I got the colours backward and mistakenly hooked up a 270K resistor to the presence pot instead of a 4.7K one (red-violet-yellow instead of yellow-violet-red). :facepalm: After swapping that, the readings are good and I'll hopefully get a chance to play tomorrow!
iff
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Re: JMP 2203 build

Post by iff »

It's alive! Here's a quick boosted clip while I put off drilling the headshell.

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itchyfingers
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Re: JMP 2203 build

Post by itchyfingers »

Fuck yeah man, sounds mean as hell! You gotta be stoked. :love:
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Devin
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Re: JMP 2203 build

Post by Devin »

Fuck yea
Whatnow2012 wrote:try humberck piskup is bettor for metal than singlecpoil for blues


Unstrung wrote:ya it am bast


Rampage wrote:When life hands you distortion, fuck everything else.

_________________
Rigs:
Bauer-Burny-Dark Matter-Hamer-Ibanez-Starfield-Warwick
Fryette PowerStation, Peavey 5150 2x12, Peavey VTM60, Starfield VPA-1, Sound City Master Lead 50, VVT Simo-Plex, Taurus THD450
iff
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Re: JMP 2203 build

Post by iff »

I realized that I never posted the final result - here we are:

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2tallmusic
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Re: JMP 2203 build

Post by 2tallmusic »

Good stuff - looks and sounds great!
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mortatone
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Re: JMP 2203 build

Post by mortatone »

Fantastic job! :clap:
VTM
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Re: JMP 2203 build

Post by VTM »

Way to bring the action!

:cool:
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Aurora
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Re: JMP 2203 build

Post by Aurora »

That looks fantastic.
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GuitarBilly
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Re: JMP 2203 build

Post by GuitarBilly »

Man the amp looks and sounds great!! Amazing job!!
Guitars:
'78 Les Paul Pro / '89 SG Special/ '04 Gibson Les Paul Classic 3 pickup / Jackson Star/ Endres Tele / Fernandes Rhoads/ ''74 Hohner MIJ strat/ 2 Partscasters

Amps:
Depends on when you ask. I got tired of constantly updating this section lol

Cabs
Marshall 1960A w V30s/ Seismic 2x12 w Redback and V30.


Questions about the forum: please PM here. Can't access the forum? Need a password reset? Please access our Facebook page https://www.facebook.com/GuitarGearForumOfficial and message me through it.
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TurboPablo
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Re: JMP 2203 build

Post by TurboPablo »

That is definitely unreal. Beautiful work!
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