Pentode Triode Switch

[überfuzz]

I want to tinker with triode/pentode on a Fenderish amp I have. Do I just lift the suppressor grid from the plate line and ground it?

[Jazz P Bass]

Technically, the 6L6 does not have a 'supressor' grid.
The beam forming plates act as a suppressor.
It's really a Tetrode.

You want to switch the Screen grid to the Plate.

[pdf64]

Technically, the 6L6 does not have a 'supressor' grid.
The beam forming plates act as a suppressor.
It's really a Tetrode.

You want to switch the Screen grid to the Plate.

[ATTACH=CONFIG]53574[/ATTACH]

Careful of robrob's site, excellent graphics but often technically some 'room for improvement' (kudos to him for all his work with it, it's easy to criticise). It's generally recommended that the screen grid always be fed via a current limiting resistor; so the triode mode should include it, rather than switching it out.
See https://el34world.com/charts/Schemat..._100w_2555.pdf

[Justin Thomas]

Rob is a member here. He was around when he started it all, and was happy to change stuff that was wrong. I don't know if he still gets feedback; I do know he is making an effort to keep it all straight & accurate as he can. Si yeah, definite kudos for leaving the wealth up, even uf not perfect! If you play nice you might get an audience...

I see him over on FarkBloop once in a while.

Justin

[überfuzz]

Thank you all for all info!

[galaxiex]

I had an EL84 amp that had a Triode/Pentode switch. (modded 1970 Traynor Guitar Mate III)

It worked ok...

As I recall, in triode mode it had a substantial drop in volume, as to be expected.

Could get some nice crunch sounds in that mode.