The circuit I'm building has a simple change over switch on the screen grid of the output valve to select triode mode or ultra linear mode.
As it's basically switching almost the full HT supply, it will need to be rated for at least 400v dc, though I would not attempt the change with the amp switched on.
I can't find a suitable switch except for industrial control panel switches.
Would I be better using a jumper lead set up, which would mean delving in the chassis to make the change, or is there a simpler solution?
As it's basically switching almost the full HT supply, it will need to be rated for at least 400v dc, though I would not attempt the change with the amp switched on.
I can't find a suitable switch except for industrial control panel switches.
Would I be better using a jumper lead set up, which would mean delving in the chassis to make the change, or is there a simpler solution?
Use a correctly rated relay powered by the heater supply. It's still best to switch off the amp when changing
Put this switch on the bottom side of the amp so you have to turn it off and flip it over to actuate the switch.
I used to use one of these when I made mine switchable. Worked fine.
https://canada.newark.com/e-switch/...GCA-GEN-Shopping-NewStructure-Switches-Relays
A later model used this instead:
https://www.amazon.com/uxcell-General-Purpose-PYF14A-Socket/dp/B0087ZTGN2
Now, I build everything wired in triode so no need for these anymore 🙂
An externally hosted image should be here but it was not working when we last tested it.
https://canada.newark.com/e-switch/...GCA-GEN-Shopping-NewStructure-Switches-Relays
A later model used this instead:
https://www.amazon.com/uxcell-General-Purpose-PYF14A-Socket/dp/B0087ZTGN2
Now, I build everything wired in triode so no need for these anymore 🙂
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