...Is there a circuit I can add like a soft start, so that I don't have to turn the amps off prior to turning the Quickie on or off? My amp switches are in the back and
I generally don't turn them off.
Thanks.
There is no such device at present.
If you have the stock version, or use choke loads, the amp won't draw current from the high voltage supply when the filaments are cold. So merely bypassing the high voltage switch would cause a short delay while the filaments heat, and while they cool down after switching the power off. That might be good enough, depending on how fast those filaments heat up.
I don't see a problem adding a slow turn-on to the PJCCS. There would probably have to be another mod for a soft turn-off. Some experimentation will be needed before there's a package to offer.
Here are some design ideas in case someone out there wants to play with them ideas before we get around to it:
For turn-off, a capacitor from the high-voltage supply **after** the switch (negative to ground) would let the voltage drop slowly. I think 1000uF would probably be acceptable; I'd prefer a 50 or 60v rating.
For turn on, a capacitor on each channel to slow the C4S bias would be needed. I'd start with one across the 4.02K resistor R1 - that resistor will discharge the capacitor when the am is turned off. But it may come on too soon that way. The alternate idea is to place the cap across both the resistor and the UF4007 diode; in that case you'd need another resistor across the cap to fully discharge it when the preamp is off. You can use the holes that straddle the mounting holes for this RC combination. I would expect something in the range of 1000uF to 5000uF ought to work, with a 20K to 50K resistor. Use a 6.3v capacitor rating.
