tubes4hifi wrote:shouting . . . ANYBODY THAT HAS A TUBE AMP OR TUBE PREAMP . . .
follow the sequence that Peter has shown, I've been using this sequence myself for over 25 years
seems common knowledge isn't very common anymore . . .
Pre-amp on. Volume at 0
Wait for relay click.
Power-amp on. Wait for relay click.
Power-amp off. Wait for relay click (and cessation of sound).
Volume to 0.
I have programmed an arduino to do this . code is here http://n.manet.nu/fm1/FM1.ino
The function is as :
When start signal(D2) comes it will power on preamp after 4s, then after
additional 21s power amp will be turned on.
When startsignal ( D2) goes down, poweramp is killed then after delay preamp.
If arduino is powercycled it will aloways go through the sequence thus
i brownout won't cycle any of the amps without any delay.
The code is more complex as it has 2 sources for power control ( D2 and D4 )
You can ignore D4 ( tie it to ground)
D7 controls preamp, D8 poweramp.
D13 controls a LED that blinks during power on/off delay, and lights when power is on.
Arduino is supposed to be constant on in this application.
Feel free to use/abuse in any way you want.