Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: thetragichero on January 19, 2021, 11:03:57 am

Title: even MORE AO44 fun
Post by: thetragichero 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

(https://i.imgur.com/6nR8H1Q.jpeg)

(https://i.imgur.com/x479roa.jpg)

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

(https://i.imgur.com/7m6iCHP.jpeg)
(https://i.imgur.com/c9q1dGE.jpg)


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

(https://i.imgur.com/KuAjbA3.jpeg)

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

Title: Re: even MORE AO44 fun
Post by: SILVERGUN 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.