So I just finished building Jef Larson's 2A3 Aikido amp...it looks awesome...but it hums like CRAZY! The hum is as loud as the music that comes through...
I have checked and re-checked the schematic, my guess is there is something wrong with my heater wiring or grouding? I understand that poor heater wiring placement can cause hum, but can poor routing really cause this much hum?
The 2a3 hum adjustment pots don't seem to be affecting the hum that I am hearing, except maybe making it a little louder at each extreme end of adjustment. Also, I don't have this hooked up to proper speakers yet, it is hooked up to some self amplified computer speakers, and since they are self amplified I can hear the hum (at a much lower volume level of course) while the heaters are on (before I turn on the power to the rectifier and the rest of the amp)
Perhaps I made a very noob mistake, or someone can point me in a direction for troubleshooting...
As always, any insight would be greaatly appreciated!
http://abraxasaudio.home.att.net/projects/2a3-2/aik2a3-2-amp.bmp
http://abraxasaudio.home.att.net/projects/2a3-2/aik2a3-2-psu.bmp
I have checked and re-checked the schematic, my guess is there is something wrong with my heater wiring or grouding? I understand that poor heater wiring placement can cause hum, but can poor routing really cause this much hum?
The 2a3 hum adjustment pots don't seem to be affecting the hum that I am hearing, except maybe making it a little louder at each extreme end of adjustment. Also, I don't have this hooked up to proper speakers yet, it is hooked up to some self amplified computer speakers, and since they are self amplified I can hear the hum (at a much lower volume level of course) while the heaters are on (before I turn on the power to the rectifier and the rest of the amp)
Perhaps I made a very noob mistake, or someone can point me in a direction for troubleshooting...
As always, any insight would be greaatly appreciated!
http://abraxasaudio.home.att.net/projects/2a3-2/aik2a3-2-amp.bmp
http://abraxasaudio.home.att.net/projects/2a3-2/aik2a3-2-psu.bmp