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  1. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    I installed the preamp tube and proceeded to measure DC voltages at each pin: They all seems to be within reason, except for the 25v on V3 pin 2 and pin 7 which I don't think is normal (should read 0 according to ceriatone voltage chart). I will have to dig deeper into that. Cheers
  2. pietro.castelli

    Simple Attenuators - Design And Testing

    This is great! Thanks!
  3. pietro.castelli

    Simple Attenuators - Design And Testing

    Sweet! I would greatly appreciate the printable drilling layout when you are done! 😉 I’m based in Europe, so mouser is definitely convenient for me! Digikey is also fine. I’d like to build the 8 ohm version with the additional 16 ohm output. I’ve already identified all the necessary resistors...
  4. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Today I plugged in the rectifier tube and proceeded measuring more voltages. This was the test setup: The light bulb limiter didn't glow and once again nothing blew up: GOOD 😀 I was able to get an healthy output at pin 8 of the rectifier tube, so I proceeded measuring voltages at the filter...
  5. pietro.castelli

    Simple Attenuators - Design And Testing

    I'm shopping for the components, but I'm having trouble finding the correct inductor. Would something like mouser 80-SCF25XV2402R006JV work? Also for switches: are mouser 691-6FB53-73 ok? For the enclose I was thinking an Hammond 1550J
  6. pietro.castelli

    Simple Attenuators - Design And Testing

    Thanks both for your precious help! This forum is absolutely great! I’ve a couple additional questions, If I may: -what’s the purpose of having out1 and out2 in the circuit? Just connecting two speakers in parallel? -would it be theoretically possible to add one more resistive stage to...
  7. pietro.castelli

    Completed JohnH Attenuators?

    Hi Folks, I’m very interested in the simple attenuator. I would really like to build one to tame the plexi 51 all access I’m finishing, but I’m afraid the 50w version will be struggling to deal with the amp. Has anybody succesfully built a 100w version of the attenuator? What changes are...
  8. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Thanks! There might be more errors for you to find though :) ... It is still a long way before it makes pleasing sounds :D
  9. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Today I've finished the sanity check of the layout. I managed to find three errors which have all been corrected already: - V1 cathode bypass cap with the wrong orientation (thanks so much @Marcomel79 for spotting it from the pictures!) - One diode with wrong orientation in the bias circuit -...
  10. pietro.castelli

    HELP WITH TRANSFORMER

    Terrific work!
  11. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    I’ve finally wired the effects loop and this officially marks the build as finished: It is now to start thinking about the startup, and that means getting equipped with some proper safety/testing equipment: I’ve purchased a used but good quality italian-made variac, that I modified...
  12. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    I’m also having some custom cabinets being built at the moment. Let’s see how they turn out:
  13. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    I've built one already! and I have also purchased a variac, so should be good for the first power-up. I'll also take my time and do a sanity check of all the wiring against the schematic beforehand.
  14. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Well, after a long business trip in the US, getting covid for the first time and many other issues I managed to find the time the continue the amp build and I almost finished it: I still need to wire the FX loop and tidy up a lot of wiring, but overall I’m satisfied with how this is...
  15. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    This week I was able to make some healthy progress. First of all I finished wiring the controls: Then I installed and wired the output transformer, the output jacks and the negative feedback control. I still have a lot of untidy wiring, but that will be improved at a further stage: Then I...
  16. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Thanks man! Your build is simply the definition of cleanliness! Before starting my kit I've been studying your build thread a lot! I'm sure you can definitely see I have taken inspiration from some of your super neat tricks! Cheers!
  17. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Thanks a lot for your comment! Looking at the detailed pictures of some factory builds from Ceriatone I think you are definitely correct! It looks like the symbols are there just to explain how to ground the shielded wire. I didn't know I could reach out to him for this kind of questions but...
  18. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    I have a question for fellow forum members, about the ceriatone layout: What's the meaning of the oval shaped symbols that I've highlighted with a red box? I appreciate it might be a very stupid question, but being new to amp building I haven't been able to figure it out yet. Thanks to anybody...
  19. pietro.castelli

    First amp build (Ceriatone Plexi All Access 51)

    Tonight I was able to do some more work after office hours! I initially redid the caps on the first tone stack switch as they weren’t neat enough for my standard, I then progressed with some more switches wiring: It was then time for the full power/half power switch:
  20. pietro.castelli

    Ceriatone Plexi 50 Build (First Build)

    Congratulation! It looks really neat! I’ve also recently started my first amp build but I have chosen the “all access” version of the plexi 50w kit. You can see my build progress here: https://www.marshallforum.com/threads/first-amp-build-ceriatone-plexi-all-access-51.127049/

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