SS Vari mu sidechain

[Dmichel123]

I've been messing around with SS sidechain circuits in SPICE. I do not have much knowledge in the SS realm, but this circuit seems to work well with fast attack time.

Any concerns with this circuit? O- is -100V, O+ and P- are +/-15V. Transformer winding at input of sidechain is 600 ohm tap of signal amp OT. Vari-gain stage will be eight 6BA6 tubes.

EDIT- New circuit. FOUR 6BA6 tubes now. I've built the signal amp, and am placing an order for some op amps to breadboard and tweak control amp.

 

[merlin]

At a glance, you need a ground reference for the + input pins of U10 & U11. Also R14/15/16/17 can be 10 times smaller.

 

[Dmichel123]

Another sidechain amp. This one is very fast, but with errors in first .2ms. Maybe better than huge overshoot in first .2ms?

 

[Dmichel123]

First circuit vs second