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Need help with VibroVerb clone

7/20/2000 4:20 PM
Nils	Need help with VibroVerb clone Hi, I just finished my VibroVerb-clone (well almost), at first I had about 415 volts at the plates, it hummed big time and squealed some. I shut it down and rewired a fault at the oscillator tube and shifted the plate opt connections. When firing up again I still had the hum, the squealing was gone, the vibrato and reverb sounds as if they are working but the vibrato mostly affects the hum. This time the b+ went up to 470 down to 430 and the bias acted strange too. I have changed the bias diode and cap but now when I put in the 6L6-pair they don't seem to draw any current 'cause the b+ is still wailing between 470 and 430 The hum only goes away when pulling the pi-tube. Any suggestions please, oh it's the 6G16 circuit

7/20/2000 4:20 PM

Nils

Need help with VibroVerb clone

Hi,

I just finished my VibroVerb-clone
(well almost), at first I had about
415 volts at the plates, it hummed
big time and squealed some. I shut
it down and rewired a fault at the
oscillator tube and shifted the plate
opt connections.

When firing up again I still had the
hum, the squealing was gone, the
vibrato and reverb sounds as if they
are working but the vibrato mostly
affects the hum. This time the b+
went up to 470 down to 430 and the
bias acted strange too.

I have changed the bias diode and cap
but now when I put in the 6L6-pair
they don't seem to draw any current
'cause the b+ is still wailing
between 470 and 430

The hum only goes away when pulling
the pi-tube.

Any suggestions please, oh it's the 6G16
circuit

Replies:

Nils Update -- 7/21/2000 9:21 AM