Re: TS-10 mods.

Thanks Stewart...
I've 10 good reasons for changing the chip and one good reason not to.
the 10 good reasons: I've 10 JRC's.
The one reason not to - There's one in there.
What I can't get my head round is the geofex description:
"The TS10 is the "sleeper". Available on the used market for as low as $20
in working order, it differs from the TS9 In only a few ways:

a.. extra 220 ohm resistor in series with the (+) input of the clipping
amp
b.. extra emitter follower in series from the input buffer amp to the JFET
switch for the bypassed condition
c.. Different bias voltage for the input buffer transistor.
If you jumper the 220 ohm, clip out the extra buffer transistor and connect
the jfet signal coupling cap to the emitter of the input buffer, and change
one resistor in the input buffer biasing circuit, you have a working TS9 in
the TS10 case. From there, two resistor changes get you an 808 circuit. Both
of these assume that you'll change out what is probably a dreadful opamp. "

As my circuit seems completely different (there seem to be no extra
transistors, component values are different too and the input stage isn't
like the ts-10 schematics I've seen) - that's why I've asked for help...

Btw... I reckon that the chips do vary - especially between old TS-808s
themselves. Age, abuse and batch variations - still think a lot of people's
ears are wrong?
cb

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