Last nite I replaced a blown output trannie in an older vox AC30 with a Dyna clone A470S from Triode. when I fired it up I got a super distorted low volume tone. the amp had a 4/8/16 ohm switch in it and as you turned down from 16 to 8 it got way quieter and there was no sound at all at 4 ohms. The amp voltages were about 20vdc too low as well. After double checking cords, speakers, switches, etc... I tacked in another OT of the same model and it worked fine, voltages were up where they should be, all is good, so I pulled the first one and installed the second. It worked great, correct voltages everywhere when I fired it up and tested it at different volumes and impedence settings for about a half hour. I closed shop and went to bed. This afternoon when I went in to button it all up the amp is now doing the same thing again it was with the first replacement. Low volume, voltages down about 20vdc,very distorted, and the 16 ohm setting is loudest, 8ohm half that and 4 ohm nothing.
I've not seen anything like this before, any ideas??
I've not seen anything like this before, any ideas??
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