Tube Amps / Music Electronics
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|7/21/2005 6:52 PM|
|Pete||Anyone worked on Vox SS Conqueror ?|
I have a late/mid Sixties Vox conqueror
I am having some trouble with.
The schematics on the vox and other sites
apart from being impossible to read values
from do not accurately reflect the actual circuit.
The most noticable I can recall is a 100 ohm
resistor to ground from the bass pot in the
schematic whereas with the actual unit the
resistor is across the pot from the wiper.
The main problem is the bright or distortion
channel.Its impossible to get a decent looking
sine wave through it as compared to the
normal channel.When using a guitar through it
the normal channel sounds full bodied and
surprisingly warm but the distortion channel
sounds thinish and gutless.
Have removed all the transistors and individually
tested them and rearranged them according to gain
(the originals have no number only a white dot)
I assume they are BC 109's.
Have checked the electros with an ESR meter
(very handy)and replaced ones that are too
far out.. or dont show any reading at all.
Being mainly a "valve guy" I was pleasently
surprised at the sound this amp is capable of.
I can vaguely remember a local band buying
a pair of ss vox's in the 60's and having endless
trouble with blowing up the output section
due to instabilitys but have read an article
detailing lack of zobel filter etc.
Does anyone know of an accurate schematic
or have any experience with these amps ?
It does work except for the reverb which
utilises 2 phonograph crystal pickups either
end of the reverb spring and one of the
pu's is not functioning.It looks like something
cobbled together by the props dept of the BBC
for the early Dr Who series complete with
rubber band suspension! Any help appreciated.
|Ray Ivers Pete,|