standby switch position

[johnny riff]

Greetings
I was wondering want is the best position for the standby switch.
1. after rectifier- before the first filter cap for the plate/ OT.
2. between OT/plate and g2.
3. PT center tap with a full-wave forward rectifier.
"3" seems like it may have less stress on the switch but not sure.
I've noticed several schematics with the lifted CT "Ampeg" etc.
Any input appreciated.

[pdf64]

...I was wondering want is the best position for the standby switch...

Short and sweet answer is ‘in the trash’
What are you hoping to accomplish?
http://www.valvewizard.co.uk/standby.html

[pompeiisneaks]

Just here to +1 pdf's response, I also remove the standby on most of my amps.

~Phil

[xtian]

+1,000,000

[johnny riff]

Hi and thanks for your feedback.
"What are you hoping to accomplish?"
well, i have the hole drilled and switch. carling off-stby-on.
wanted to lift the CT, would this work? or something like the link valve wizard shows.
series resistor on the switch.

[pdf64]

Lifting the HT winding CT works but may be a bad idea if there was a bias tap from it.

[johnny riff]

I should have mentioned its a cathode bias output.
My PT is 700 ct so a tube rectifier is in order, would that be problematic?
the thing is it's the only switch I have.
plus when you elevate the filaments 6.3 is that a fix bias thing or can it be done with cath. bias output above the cath. voltage?

[pdf64]

...the thing is it's the only switch I have...

Have you considered buying another, or just wiring it so that the centre position is that same as the 'on' position?

...a tube rectifier is in order, would that be problematic?...

See valvewizard's 'least bad' arrangement, towards the end of the linked page of previous post.

...plus when you elevate the filaments 6.3 is that a fix bias thing or can it be done with cath. bias output above the cath. voltage?

(Shared) cathode bias makes implementing a +Vdc offset for the heater circuit easy peasy, eg https://el34world.com/charts/Schematics ... entury.pdf
Hint - heaters are referenced to the power tube cathode

[johnny riff]

Thanks for your input PDF.
From the Valve Wizard site its not recommended to "hot switch" the tube rectifier
(still working out values for current limiting resistors). I have the center position of my switch -ac for heaters and lifted ct. top position engages ct. I assume this is not "hot switching" but will not come on instantly- I suspect due to warm-up time for tube rectifier(gz34).
I realized after asking that you just connect fil.ct to power tube cathode+ before R and C.

[pdf64]

Hot switching means switching a uncharged reservoir cap on to a hot rectifier. The method you propose would be hot switching.

[johnny riff]

gotcha- the 5v would be on before the HT-winding.
I left some extra length on my tranny wires,, a good thing.
I'll move it between plate cap and screen.

thanks again pdf

[pdf64]

Why not follow valvewizard’s recommendation, switch between reservoir cap and the rest of the amp, trickle bypass resistor across switch?

[johnny riff]

"Follow valvewizard’s recommendation".
That's the plan. just need to modify my board with an extra eyelet. piece of cake!
thanks again pdf