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  1. Timo V

    Marshall Origin Clipping

    Here's a tip if your amp is too mushy. Put an EQ in front of your amp and set sliders like in this image. This way it accentuates just the right frequencies. This effect cumulates downstream in the amp making it feel much "gainier" and crispier. And BTW, my six-band MXR handles 18Vdc for power...
  2. Timo V

    Marshall Origin Clipping

    I like the boost! I've modded it to be very close to 1987 but without cathode follower, and always play it little animal killing volumes master volume at 7 or 8.
  3. Timo V

    Marshall Origin Clipping

    If you are wondering is there diode clipping, there's not. There is less attenuation between first and second gain stages at certain frequencies when boost is on. Boost also switches on the cathode capacitor of the second gain stage. It's tube all way down.
  4. Timo V

    fav amp you own

    OR15, the biggest sounding little amp on Earth.
  5. Timo V

    I'm Drunk And

    And now i'm drunk with a moonshine from my own still, and cranking my modded to hell Origin 50! What kind of the Hell loop is this?!
  6. Timo V

    Marshall Lead 100 Mosfet 3210 - replacement mosfet subs

    I bought them just in case. They test good and look absolutely identical to those in my 3210, patina and all.
  7. Timo V

    Marshall Lead 100 Mosfet 3210 - replacement mosfet subs

    How about these? Should be originals. I ordered a pair and got them within a week. https://www.ebay.com/itm/Hitachi-MOSFET-2SK134-2SJ49-TO-3-1-Stk-1-Paar-o-2-St-ck-Transistor-Audio/254033483187?pageci=733dd323-634a-42b0-8b35-2f4d64af4a2d&redirect=mobile
  8. Timo V

    Show your stash, OR "the great tube panic relief thread"

    Yes, and for B+ and bias voltages too. There's a high voltage boost converter on the PCB.
  9. Timo V

    Sound coming out of amp head (jvm)

    Loose laminations? Tighten up the screws holding the transformer stack together.
  10. Timo V

    Western Electric considering adding more tubes to their current USA production

    At the ancient ax84.com site we experimented quite a bit to eliminate blocking distortion and duty cycle shifts caused by the grid current. After so called "DC drive" was introduced by CarlB, the differences between "good" and "bad" tubes (in other circuits) were inaudible. Schematic of the...
  11. Timo V

    Western Electric considering adding more tubes to their current USA production

    Yes. If two tubes are in nominal specs and in a same circuit, differeating factor in sound is grid current.
  12. Timo V

    Show your stash, OR "the great tube panic relief thread"

    Schematics and instructions came with the PCB. I don't remember if they were in french, but it was easy enough to put together...
  13. Timo V

    Show your stash, OR "the great tube panic relief thread"

    I have tubes to last my lifetime, but most valuable tool to manage my stash is a tubetester i build ten years back. I'll never part with it. http://koti.japo.fi/~tivahal/Tubetester/Tubetester.html
  14. Timo V

    Anyone have a clue what this is??

    146028699373 If that's the case then it's a huge overkill. There's two same sized PT's lurking in shadows in the right side of the chassis.
  15. Timo V

    Anyone have a clue what this is??

    Man, i did not know Bonk Industries were in amp business... https://en.m.wikipedia.org/wiki/Bonk_Business https://www.bonkbusinessinc.com/ Anyway, it would be fun to bring it back to life!
  16. Timo V

    Anyone have a clue what this is??

    WTF?!! Is there two power transformers in there? Who the hell do things like that? Old one apparently burned, but why leave it there?!
  17. Timo V

    A schematic of Origin 50H pre-amp, and a usefull mod.

    I just dug in little deeper into my ORI50, and i can now confirm that PI and power stage are close to conventional Marshall values. Couple things though; MV to PI coupling cap is 100n instead of 22n, PI grid resistors are 470k (1M), bias feed resistors are 150k (220k) and NFB is taken from OT 16...
  18. Timo V

    A schematic of Origin 50H pre-amp, and a usefull mod.

    Nothing weird in power amp, just what you would expect to see in Marshall. 150 kOhm grid reference resistors were nice find when i was trying 6550's, but i may actually change them to 220 kOhm as i prefer EL34's. Can't say for certain about presence-circuit, otherwise your drawings are spot on.
  19. Timo V

    A schematic of Origin 50H pre-amp, and a usefull mod.

    Sorry, no schematic for a whole amp, but power amp is a stock Marshall one, except for power scaling and 150 kOhm bias feed resistors. Power scaling works by dropping screen grid and PI voltages with MOSFETs, "low" and "mid" settings have set bias voltages which can't be adjusted, and that's why...
  20. Timo V

    Will this work in my Origin50?

    We have a saying in our country that goes like: "Luke was a great apostle, but one fucking bad electrician."

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