Tube Guitar Amp #3 made from Hammond AO-44

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The Hammond AO-44 organ reverb amp can be made into a fantastic little guitar or harmonica amp and is reasonably easy to refurb. This one was in excellent condition as received and therefore I had less than normal to do to complete the upgrade. The transformers and tubes, are all original Hammond.
The AO-44 makes an excellent little guitar amp, producing about 8 watts and some beautiful tone, even at low volume. It makes a fantastic bedroom and/or recording amp.
My friend Buzz is playing the guitar. The amp is connected to a custom made speaker cabinet which holds an ElectroVoice EV12L speaker. Buzz built the cabinet to ElectroVoice specifications.

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12 янв 2011

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Комментарии : 3

@70moparbaby 12 лет назад

i really liked the last bit you were playing

@HammerToneAmps 13 лет назад

@ihventura Thanks for your comments. The organs these are found in are the A-100 and M-100.

@AdamRainStopper 10 лет назад

Pretty cool, I have one, all I did was rip out the low-pass filter on the input....along with the transistor that Hammond seems to have thrown in as an afterthought (obviously to boost the signal up enough to fight its way through the h-p filter), and jumped the input to the grid of V1. Oh yeah, I also DC'ed the NFB loop. I didn't even bother putting in volume or tone controls, it's clean with my tele and slightly crunchy with my squier black & chrome fat-strat. The clean is big, warm, open, and the crunch is just a little muddy, but I mostly use it as a clean power amp for my Frenzel pre, which has gain/master and 3 band eq. I eventually want to build a clone of either a Soldano pre or maybe try to create a standalone preamp version of a JCM-2000 preamp section, and I'll use the Hammond to amplify that. The AO-44's are nice, lots of people convert them to run EL84's, a kind of "18 watt lite" conversion, but I say save your 18 watt conversions for the AO-35's, and use these with the ECL86's and keep the mods minimal like this dude did. The P/P 2xECL86 output is a sort of 'best kept secret' to a wonderful medium volume clean recording amp, and it takes external preamps and pedals really well. And for you "audiophiles" out there, get a pair of these and do what I did minus disconnecting the feedback loop, and you have a perfect pair of monoblocks for all your old Dick Dale records....