Jesper Findshøj
New member
HI everybody
I have bought a used VMA, not sounding as I hoped, AND the switching between VM1 / VMX mode doesn't work
a very skilled friend, have drawn the schematics for me to understand how the switching works.
as seen on the drawing it's a relay switching between 2 capacitors who are decoupling the cathode on the 6922 tube.
unfortunately it looks like the mic was repaired wrong, or even built wrong from the start...
for now it's 2 totally equal capacitors with 470uf ( c1 & c2 ) on the drawing.. which means no difference in sound..
i se that a no vm1 has a 47uf as cathode decoupler ..
QUESTION:
- does anybody know what the right capacitor values would be ?
- is the 6922 the right choice ? other brauners use 6267..! can't find any documentation from Brauner which will be the right one...
best regards
Jesper Findshøj
I have bought a used VMA, not sounding as I hoped, AND the switching between VM1 / VMX mode doesn't work
a very skilled friend, have drawn the schematics for me to understand how the switching works.
as seen on the drawing it's a relay switching between 2 capacitors who are decoupling the cathode on the 6922 tube.
unfortunately it looks like the mic was repaired wrong, or even built wrong from the start...
for now it's 2 totally equal capacitors with 470uf ( c1 & c2 ) on the drawing.. which means no difference in sound..
i se that a no vm1 has a 47uf as cathode decoupler ..
QUESTION:
- does anybody know what the right capacitor values would be ?
- is the 6922 the right choice ? other brauners use 6267..! can't find any documentation from Brauner which will be the right one...
best regards
Jesper Findshøj