sethyrish
Active member
I seem to be having problems getting my G7 to work. Changes I’ve made have been a 240v to 12v secondary transformer in PSU as a 220 to 15v doesn’t seem to be available in Australia. The 10K resistor between the two 470u/200v electrolytic has been replaced with a 30K to give;
Unloaded
Pins 1-2 182.9v
Pins 6-7 6.1v
Pins 1-5 91.9, 0.0,182.9v
With mic attached;
Pins 1-2 125.0v
Pins 6-7 5.9v
Pins 1-5 63.0,0.0, 126.6v
Some other voltages are;
Between 470k resisters 66.0v
Pin1-capsule, Front 0v, Center 14.6v, Back 0.6v.
The valve is warm but not glowing.
Big thanks to Jakob and all else involved. I’ve already started another two projects but have to finish this first.
Any help would be appreciated.
http://members.iinet.net.au/~tinasime/Grille.jpg
http://members.iinet.net.au/~tinasime/IMG_3180.jpg
http://members.iinet.net.au/~tinasime/valve%20trans.jpg
http://members.iinet.net.au/~tinasime/set.jpg
http://members.iinet.net.au/~tinasime/psu2b.jpg
http://members.iinet.net.au/~tinasime/mic-stuffed.jpg
http://members.iinet.net.au/~tinasime/capsule%20Z%20area.jpg
Unloaded
Pins 1-2 182.9v
Pins 6-7 6.1v
Pins 1-5 91.9, 0.0,182.9v
With mic attached;
Pins 1-2 125.0v
Pins 6-7 5.9v
Pins 1-5 63.0,0.0, 126.6v
Some other voltages are;
Between 470k resisters 66.0v
Pin1-capsule, Front 0v, Center 14.6v, Back 0.6v.
The valve is warm but not glowing.
Big thanks to Jakob and all else involved. I’ve already started another two projects but have to finish this first.
Any help would be appreciated.
http://members.iinet.net.au/~tinasime/Grille.jpg
http://members.iinet.net.au/~tinasime/IMG_3180.jpg
http://members.iinet.net.au/~tinasime/valve%20trans.jpg
http://members.iinet.net.au/~tinasime/set.jpg
http://members.iinet.net.au/~tinasime/psu2b.jpg
http://members.iinet.net.au/~tinasime/mic-stuffed.jpg
http://members.iinet.net.au/~tinasime/capsule%20Z%20area.jpg