Rocket question

[JoeCon]

Guys

When I built my Rocket I went with the stock 1st gain stage plate resistor of 220K. But I read where some builders liked a 100K there to lower gain a bit and make it better/more versatile for giging.
Well I tried it recently and also like that circuit. Now I want both...
Would this be a situation where a split plate load would work? Like a 100K and 120K in series and then just branch off to a switch that would give either load?

Thanks...

[brewdude]

I think the split load would provide the same load, but give an attenuated signal.

[RJ Guitars]

There are guys who put that on a toggle switch and call it something clever like the Jazz/Blues switch. Keep in mind that you are talking about switching some significant voltages so using a switch on the front panel to trigger a relay is another good option.

[Smokebreak]

Split load is different than 1 or the other plate load value, in that it acts more as a voltage divider. Nonetheless it still may accomplish what you are trying do. If you do the split load, make sure and use 2 coupling caps(one off the plate, and one off the split load), and put the switch there, to keep HT off the switch or relay or whatever.
There's no elegant way to simply switch out Rp values, but I've surely done it!
I would keep the 220k static in circuit and switch in a180K in parallel , on the plate side, where the HT is a little lower. It'll pop less that way .
Another option would be to increase the cathode resistor, and keep the Rp 220K, which essentially kinda has the same effect as lowering the Rp..kinda.
Let me know if you need drawings.

[M Fowler]

Talk to colossal about this switching.

[JoeCon]

Mark
Thanks I will talk with Dave, I know you like the 120K plate load on the Rocket for less gain and more headroom so I tried it and man that is nice. But I also liked that 220k as it got dirty faster. What to do...

Smoke,
So couple into the caps first and then use a switch to send the signal to the next stage. So the caps connect to the switch not after it, got it. And you could even use two different caps to tailor the sound more.

RJ
Yeah I like the Jazz/Blues setting nice...mines a Fowler 18watter Rocket build and boy it's hard to beat. I might try this split plate thing on a Rockster type build next.

Thanks...