No announcement yet.

Hammond AO44 to "near-Match" Spitfire

  • Filter
  • Time
  • Show
Clear All
new posts

  • Hammond AO44 to "near-Match" Spitfire

    I snapped a key contact in my second craiglisted $50 M100 while attempting to adjust the bus bars. Since I'm getting an M3 this week, I made quick use of the parts.

    This was a sister build to the other AO44 amp. I reused the PT, OT, chassis, 6CA4, and 6GW8's adding a 12AX7. Circuitwise, it is darn close to a Matchless Spitefire with a few substitutions based on what parts I had on hand.

    Pics 1 & 2 show how far I stripped it down. Sometime long in the past there was trouble near the rectifier and a repair was made. Everything worked quite well before teardown thankfully.

    Test fitting the parts.

    First test run and it was too much amp for the C12R. It's now sporting a screamer of a ceramic speaker I pulled from my CL'd Leslie 225.

    This amp was a fun build and challenge to layout but fired right up the first try and sounded so dang good doing it. I sometimes think I go overboard with the shielded signal wire but the amp is dead silent despite the very close quarters.

    Next up on my list is a Conn 541 amp to bass amp conversion. I'll try to document it a bit better.
    Last edited by chris937; 07-08-2015, 11:03 PM.

  • #2
    Aren't you short a 12AX7 for a spitfire?

    I have a Davis 201A PA that I need to convert to a guitar amp. It's got 2 EL84s and I was going to replace the 6EU7s with 12AX7s. Maybe a spitfire circuit would be a good one to follow. I think the voltages off the transformer are within about 10V of the spitfire... It has three 6EU7 sockets, so I might even be able to add tremolo and reverb...


    • #3
      Nope! I'm one of the 6GW8's triodes (equivalent to a half 12AX7) for that first gain stage and using the 12AX7 I added as the phase inverter.


      • #4
        Doh! I forgot you mentioned the 6GW8s. So you've got a spare triode from the other 6GW8. If you've got the current to spare, you might want to add a tremolo. Pretty simple circuit and it only requires a single triode.

        I have a little amp with a 6GW8 SE (somewhere in the 3-4W arena). It's a nice sounding little amp.


        • #5
          You know, I'm not particularly inclined to squeeze anything in there that I already haven't. This was my first time using 6GW8's but I like them. I still have the pair and OT from the other AO44 I should do something with.


          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 gaziantep escort
          atasehir escort
          antalya escort bayan escort atakoy
          izmit escort
          ankara escort
          replica watches