Standby Switch

[TIMBO]

Hi guys, Got a valve rectified amp that uses a DPDT standby switch. Half the switch is connected to the CT of the PT, this I know is not good.
The other half has an indicator lamp connected using the 6.3v heater supply.

As per the valvewizard http://www.valvewizard.co.uk/standby.html
The best bad way is to put the standby switch after the reservoir filter cap with a bleed resistor across the switch.

Should I be concern that the DPDT switch will now have approx. 600vdc on one side and 6.3vac on the other.
The amp was built in the 80's and is the original switch.
 

[kagliostro]

The best bad way is to put the standby switch after the reservoir filter cap with a bleed resistor across the switch.

I think you mean The Least Bad Way is to put the standby switch after the reservoir filter cap with a bleed resistor across the switch



The Standby switch on the CT result in 1/2 the AC voltage on the switch (considering voltage at the extremities)

Franco

[TIMBO]

Thanks K, That's what I meant.
After rectification the voltage on the switch is approx. 600v.
I'm concern that the switch is not capable of handling that sort of voltage and it may arc to the 6.3v side.

[kagliostro]

As you say, also I think that is a reasonable possibility

if the amp is so from the '80, may be it will be better to leave it as is

but wait for the opinion of someone that is more skilled than I

Franco

[dbishopbliss]

Valve Wizard makes a case to NOT have a standby switch at all. Could you just remove it?

[kagliostro]

You can "move" it to a mute switch, but I don't know if the 6.3v AC can give problems if you move to the switch the signal of the volume pot

Franco

[pompeiisneaks]

You could create a mute switch really easily by shunting the input jacks to ground :)  (or just after the first input stage, either way, it's easier/better than a standby :P)

~Phil

[DummyLoad]

hoo needs a nassy 'ol standby switch anyhow...


--pete

[TIMBO]

Hi guys, Your thoughts on this setup for a standby. Thanks
http://www.londonpower.com/standby-switch