Hello,
Purchased and built a kit from Triode Electronics based on their diagram. See product here
http://www.triodeelectronics.com/100wmarshkitv2.html
Video of the sound here, this is with no speaker connected just the amp itself squealing. In Hamilton Ontario Canada so this is on 120V mains.
https://youtu.be/oT6fO0Y2LjY
I thought it was a short, redid all the wires, thought it was interference, shielded all signal lines, thought it was tubes, checked all of them and fully functional to spec, thought I blew a transformer, checked all those and also at spec, flipped grounds all around and confirmed an accurate loop on the ground.
Plate voltage reading at 378, set bias at 31ma.
Sound does come out when I connect a speaker but it is amplifying that sound when the speaker connects, it does go away in the amp but then the speaker sounds similar, high pitch hum, signal does get through but is nominal.
See the wiring diagram, it doesn’t match much of the schematics I find for a Marshall 2203 with a MV mod, should note that switch I’m flicking is standby and the knob is the Master Volume, no other knobs affect this tone or sound.
Left on and the volume up blows the HT fuse.
Any and all help is appreciated.
Purchased and built a kit from Triode Electronics based on their diagram. See product here
http://www.triodeelectronics.com/100wmarshkitv2.html
Video of the sound here, this is with no speaker connected just the amp itself squealing. In Hamilton Ontario Canada so this is on 120V mains.
https://youtu.be/oT6fO0Y2LjY
I thought it was a short, redid all the wires, thought it was interference, shielded all signal lines, thought it was tubes, checked all of them and fully functional to spec, thought I blew a transformer, checked all those and also at spec, flipped grounds all around and confirmed an accurate loop on the ground.
Plate voltage reading at 378, set bias at 31ma.
Sound does come out when I connect a speaker but it is amplifying that sound when the speaker connects, it does go away in the amp but then the speaker sounds similar, high pitch hum, signal does get through but is nominal.
See the wiring diagram, it doesn’t match much of the schematics I find for a Marshall 2203 with a MV mod, should note that switch I’m flicking is standby and the knob is the Master Volume, no other knobs affect this tone or sound.
Left on and the volume up blows the HT fuse.
Any and all help is appreciated.
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