Wow dude, you've really got your brain wired to this stuff...Pretty impressive...Greg_L wrote: ↑Fri Jun 08, 2018 3:00 pm I'm pretty sure the DSL uses a pentode/triode switch to cut power. It's not really halving the power, but it's disabling parts of the power tubes. A pentode tube has five working parts (pent) and switching them to triode cuts that down to three (tri). You're turning off the suppression grid and the screen grid of the pentode. The suppression grid keeps hot fiesty electrons from bouncing all over the place inside the tube, and the screen grid sort of funnels electrons straight to the plate. Both of these grids make the tube very efficient. Turning them off puts the tube in triode mode, which involves just the basic essentials - plate, control grid, cathode - and this makes the tube behave much less efficiently, therefore, less power.
JD's amp, since it apparently involves heat, must have some kind of mini-attenuator built in, or some kind of power scaling. Both create heat and both allow the power tubes to stay in pentode operation while cutting output power.
That's what the low power switch on the DSL100 is/was dude, exactly...
I'd say Jdude's H&K does a better job since the circuitry/technology is different than the DSL...The Mini Jubilee does pretty good in 5w mode, & I can't tell that much of a difference in the tone...There is a difference, but it's nothing like the DSL, which seemed to knock some of the high end off, which is caused by turning off parts of the tubes like you described...
, the only real difference other than it being brand new, is the "Pussy Trimmer" gain adjustment knob will already be on the back/outside of the chassis...The other one I had, I had to install/move the pot myself, because it was an older model, & the pot on the outside comes standard/stock on 'em now...
