BA6110 (was: Re: The science of reverb springs and TB's VCA)

[Tony Allgood]

JH said:
>In what way do they differ then from other OTAs ? (speaking of sound, I
mean; not the level shift of the buffers ...)

I could not tell the difference between the 662 or the 6110. There was a
slight change in gain between the two, the 662 being louder by about 10
per cent. This is more to do with Gm tolerance perhaps. I don't have the
specs for the 662 to compare, and I haven't tried the two together in DC
test, just in the TB clone.

>I remember some early Roland synth had a 4-pole filter built from
these.
Would it be worth building that, would it sound different from 3080
based filters?

I don't think it would, but I think filter sound has more to do with
topology rather than devices. However, I may well be wrong. In the UK
the 662 is cheaper than the 6110, but the LM13700 is cheapest by a long
way. Are there differences between the 3080 and the 13700 sonically in
the same topologies? The 13600 and 13700 sound alike in my poly's VCFs,
however, I have a TL072 as the voltage followers rather than the
darlington pairs.

The distortion diodes may well play a part here. My 13700 VCFs do not
use the diodes, the TB VCA likewise.

Regards,

Tony Allgood, Cumbria, UK

Rack mounted moog filter and the TB3030 SuperBassline projects:

http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/