No announcement yet.

Converting 1968 Traynor YVM-1 to marshallesque Guitar amp

  • Filter
  • Time
  • Show
Clear All
new posts

  • Converting 1968 Traynor YVM-1 to marshallesque Guitar amp

    I picked up this fine specimen of a 1968 Traynor YVM-1 (PA tube amp), and decided to modify it somewhat for guitar purposes.

    Here's the original schematic:

    Here's what I've modified it to be:

    Basically I have sort of a plexi front end with a few alterations, a pre phase inverter master volume. I upped the filtering somewhat, replaced all the electrolytics, added new individual screen grid resistors, added 5.6K control grid resistors, changed diodes to new 1N4007's, added a midrange pot to the existing tone circuit which I actually really like, added a depth control, and obviously changed the power cord to a grounded type.
    I still plan to change tube sockets just to make sure connections are nice and tight.

    The amp absolutely screams and is just perfect.. I was originally planning to do more of a 2204 preamp and tone circuit, but I like the slightly less gainy plexi modified preamp that I went with. Just thought I'd put this out there since it's a really great amp as it is, and if anyone's got one of these, I'd highly suggest modifying it as I have. Very simple to do, and able to keep almost all original mustard caps in place.
    I'm very pleased with the way it overdrives, and it keeps a lot of string definition even when the gain is cranked up. Very very happy with it. I'll post some screenshots when I get a chance.

  • #2
    Just an update for anyone interested in this subject.. Because I was only using 3 of my 4 12ax7's, I decided to wire up the 4th for trem, using the same circuit that Traynor uses in the YSR-1.
    It's a bias tremolo. Watching some videos on youtube of the YSR-1 the trem sounded pretty nice, which I didn't really expect for a bias tremolo with el34's. Anyways, I wired it up, and damn does it sound and work perfectly! I highly recommend this trem circuit for anyone converting one of these amps.

    Here's my updated schematic:


    • #3
      So, I decided to pull the trem out just to keep things simple.
      I really love the amp, super great sound.

      Here are some pics:


      • #4
        Greetings- I'm new here and looking around found your Topic. I've followed this schematic a little where posts on the Web are found occassionally. If I may ask: What does the Depth control do? I see it is some sort of filter added to the presence control?

        I'm guessing this amp gets a nice old 70's grit like I'd heard back then in the Taverns from Bands like Trigvee Ly- East Coast Blues Band.

        I'm here in search of information for a conversion I'm working on. I'll post that elsewhere.

        Nice build.



        bostanci escort
        sisli escort mecidiyekoy escort
        pendik escort
        sex vidio
        altyazili porno
        antalya escort
        beylikduzu eskort bayan eskort bayan escort antalya sirinevler bayan escort
        gaziantep escort
        atasehir escort
        antalya escort bayan escort atakoy
        izmit escort
        ankara escort
        replica watches