now built, initially using 47 kQ for R30. R IV at U2, The no-signal dc voltage at the detector T o R SB-recover output (emitter of Q7) was 6.8 V. so the inn of "offset" pot R31 was set initially to this value. The Op-amp, U2, buffers the 1 " control voltage appearing across the timing capacitors, C19 and
