Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 09:41:04 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: even MORE AO44 fun  (Read 1550 times)

0 Members and 1 Guest are viewing this topic.

Offline thetragichero

  • Level 3
  • ***
  • Posts: 582
Hoffman Amps Forum image
even MORE AO44 fun
« on: January 19, 2021, 11:03:57 am »
hey why not add to the fun!
since the output transformer on this is the same as what comes on the ao-43 (which I'm a fan of) i swapped in the ot from a thomas organ (used the pt from that thomas in a 6l6g vibrochamp build). then i painted them red because... there was a little bit of red automotive paint left in a spray can. good enough reason for me





big sprague atom electro cap had been floating around my parts bin for years after removing from a 5e3 build i gutted... turned out to be leaky so that's gone along with some other swapped components

in the 1x12 combo cab with an alnico speaker pulled from a conn transistor organ





haven't updated the schematic to remove the preamp cathode bypass caps or adjust the power amp bias resistors



soundwise it's interesting. nice cleans but gets dirty fast like a tweed. has a tweedy "rasp" from about 3 o'clock until 9 o'clock on the volume and then somehow sounds like a metal amp with the volume cranked. digging the moonlight tone control. still wanna try a 5751 in place of the 12ax7 for more cleans
« Last Edit: January 19, 2021, 11:07:01 am by thetragichero »

Offline SILVERGUN

  • Level 4
  • *****
  • Posts: 3507
Hoffman Amps Forum image
Re: even MORE AO44 fun
« Reply #1 on: January 19, 2021, 11:21:05 am »
Nice!
Holy resistor pileup  :huh:

I will pray for you that you may never have to replace a tube socket.

I don't know how you did it, but I applaud your gumption. Thanks for sharing.

 


Choose a link from the
Hoffman Amplifiers parts catalog
Mobile Device
Catalog Link
Yard Sale
Discontinued
Misc. Hardware
What's New Board Building
 Parts
Amp trim
Handles
Lamps
Diodes
Hoffman Turret
 Boards
Channel
Switching
Resistors Fender Eyelet
 Boards
Screws/Nuts
Washers
Jacks/Plugs
Connectors
Misc Eyelet
Boards
Tools
Capacitors Custom Boards
Tubes
Valves
Pots
Knobs
Fuses/Cords Chassis
Tube
Sockets
Switches Wire
Cable


Handy Links
Tube Amp Library
Tube Amp
Schematics library
Design a custom Eyelet or
Turret Board
DIY Layout Creator
File analyzer program
DIY Layout Creator
File library
Transformer Wiring
Diagrams
Hoffmanamps
Facebook page
Hoffman Amplifiers
Discount Program


password