In this video I walk through a Hammond AO-29 Organ amplifier that I converted to a Trainwreck Express style clone. It needed some quality of life improvements like fixing the power cord and input jack. It needed to be rebiased. Then I chased an issue where the volume would drop very low. I rolled some tubes to see if that was a problem and to see how they compare tonally.
Timeline:
0:00 - Intro
0:55 - What is wrong?
3:14 - Biasing the output tubes
5:58 - Rolling different 12AX7 preamp tubes
12:56 - Chasing the low volume problem
16:00 - Tone demo
The tube bias calculator I use by Rob Robinette - https://robrobinette.com/Tube_Bias_Calculator.htm
Information on this build - https://www.tdpri.com/threads/hammond-ao-29-organ-conversion-2-to-ab763-and-beyond.763327/
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