SOLD: DIY High-Gain Jose 2204/JCM800

Discussion in 'Member Classifieds' started by FourT6and2, Oct 5, 2019.

  1. FourT6and2

    FourT6and2 Active Member

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    50-watt 2204 circuit with Jose-style high gain mods.

    Built using a Ceriatone chassis and blank turret board. It's whatever you'd like to call it, but it's not a Chupa or Yeti. I've got a few of these built and just need to clean house a bit. Too many amps.

    This amp is angry and mean. It has snarl and aggression and it's tight and stops on a dime. But it also has a sweet and musical upper-mid range and slightly meaty in the lower mids. It can do cleans as well, but it's single channel and meant more as a modern high-gain machine. But it can do lower gain stuff all the same. Drop-tune or use a 7/8 string and it will do all the djenty heavy chugga chugga stuff no problem. Probably not the best choice if you like neon pink zebra spandex.
    • Custom power and output transformers by Marstran. JTM45 1202-55 PT and JMP50 784-139 OT.
    • F&T filter caps.
    • IC MPW signal caps, with NOS Vishay/ERO MKT1813 cathode bypass caps
    • High quality, low-noise, non-inductive Beyschlag MBE0414 thin-film resistors. 1 watt, 500v, 1%.
    • Vishay 1-watt, 500v, 1% metal film resistors in bias supply.
    • Mix of high-quality NOS caps in tone stack, PI, Presence, Depth, and voltage divider.
    • All hook-up wire is silver-plated PTFE and ETFE, rated at 600v.
    • Alpha pots.
    • Genuine UK Cliff jacks.
    • Shielded coax used in key places to reduce noise.

    Since I hate when people sell modified amps and don't actually tell you what the modifications are, I'm going to do the opposite. The changes compared to something like the Goat Sucker are as follows:
    • Input: 1M/33K
    • First gain stage: 2K7/0.68uF, 0.0022uF coupler, 330k plate load
    • Second gain stage: 2K7/0.68uF, 0.022uF coupler, 100K plate load
    • Third gain stage: 820R/0.68uF
    • Gain 1: 68K/68K voltage divider "Feel" control (bright switch deactivated, not connected)
    • Gain 2: 4700pF bright cap and 500pF bright cap on three-way switch
    • Presence: 0.1uF
    • Depth: 2200pF
    • No "Pussy Trimmer". Instead, typical Marshall voltage divider.
    • Tone stack: 33K/470K
    • Jose master volume with clipping diodes on three-way: 1N4746 on one side and MPSA06 on the other.
    • Passive insert FX loop
    • PI: 0.047uF caps, 120K grid leak
    • NFB: 47K/8ohm
    • Regulated DC heaters on V1/V2
    • Dual bias control

    Ok, so what does all of this mean? It means it's similar to many of the other Jose-style high gain 2204 mods out there. Just voiced a little differently. Depth control isn't as deep or boomy. It's shifted up a bit higher into the sub-low mids and more punchy and vocal. Amp is tighter and has more grunt than some of the other monster-named offerings on the market. The Feel control on Gain 1 is a push-pull and when pushed = full gain and low-end response. Pulled = tighter with more snarl and aggression. Tone stack is closer to stock Marshall so it has more of that "kerrrrrannggg" that people love instead of a scooped fizzy mess. Phase inverter passes more low-end than stock Marshall. So it has a deeper, more lush timbre.

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    Last edited: Oct 14, 2019
  2. Adrian R

    Adrian R Well-Known Member

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    Man, that sure looks awesome! Really nice work...like the external bias points... You should post a few audio clips...
     
    JCarno likes this.
  3. FourT6and2

    FourT6and2 Active Member

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    I'm working on a clip. Gonna be busy with work the next few days though. But in the meantime, it basically sounds like this other build I did but a little more full/deep/lush and a tiny bit more polite.

    Skip to about 25 seconds or so.

     
  4. NewReligion

    NewReligion Well-Known Member VIP Member

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    Great sounding Jose especially for the price. Awesome work. I see the Resonance, The Voicing tags right off of it and aids with different cabs/guitars.

    David...♫ :hbang:
     
  5. royslead

    royslead Well-Known Member

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    Very neat and tidy work, nice!
     
  6. FourT6and2

    FourT6and2 Active Member

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    Sale pending
     
  7. FourT6and2

    FourT6and2 Active Member

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