🚀 go-pugleaf

My preamp is dying a slow but noisy intermittent death.  I have decided
to build a new one from scratch.  I am going for a minimalist type
preamp: input selector, volume control, on/off switch.  Maybe a pilot
light, no tape monitor, no headphone, no tone or balance controls.
Somebody else can have that 747 cockpit on night instrument landing
look.   :-)
 
Having followed and independently verified the recent thread on volume
controls, or more strictly, the difficulty of obtaining suitable pots
for them, I decided to go with the high performance voltage controlled
amplifier in Walter Jung's "Audio IC Op-amp Applications."  This would
let both channels share a no gang pot which need not be audiophile
quality.
 
This circuit requires a CA3019 which is a bunch of diodes, a ca3080a
the actual VCA chip, and a pair of 3140 j-fet op-amps.  No local parts
house will confess to any stock or even knowledge of a 3140.  I looked
in the D. A. T. A. book, and they suggested a substition for the 3140
of an OP41.  The OP41 appears to have substantially lower performance
than the 3140 which in turn was kind of suspicious.  I was unable to
locate the ca3080a in the book at all.
 
So my questions for the collective net.wisdom are:
  1)  What should I use for the 3140?  Jung says it must have a
         high input impededance.  I say it must sound good.
  2)  What is the likelyhood that I got the right ca3080a or
         reasonable substitute from my local parts house?
  3)  Is there some other high performance chip that will do without
         all the accessory bits?  The circuit, as drawn, has three trim
         pots, eight diodes, and three op-amps per channel.  (pushing
         it for a minimal preamp)
 
The book looked so reasonable till I reached for a soldering iron!
I will be grateful for replies either by posting to the group, or
email.
 
Mike.Coyne@utxvm.utexas.edu
Coyne@utxvm.bitnet