
V2a
Active member
Jdub":37erhedf said:V2a":37erhedf said:people do seem to love the Trainwreck Express and related amps.
As far as I know, the Komet 60 is not Class A - very few push-pull amps are. It's probably Class AB like everything else. The fast/gradual switch didn't alter the mode of the power tubes (e.g., triode/pentode) but rather cut some gain late in the preamp.
I believe you re correct on the AB but think you are wrong on the latter. It affected the attack more than the gain. but I am no electronics guru so not positive on what it did. and don't PP amps have a presence control ? Single ended amps don't right? I don't know squat technically and don't even know wtf that means. but the K60 has no Presence control. it does have a hi cut. Amazing tone machine regardless!
PP and SE amps can have presence controls. The conventional presence just takes some of the high-frequencies out of the negative feedback loop. You can put a NFB loop in anything, although they are often missing from some designs by convention.
The conventional Hi Cut sits across the push-pull lines and cancels out some high frequencies. Take out a capacitor and you cancel out all frequencies (i.e., you have a simple post-phase-inverter MV).
The fast/gradual switch is indeed a late-preamp "gain" switch that cuts the signal in gradual mode. I won't divulge the details, and I'm sure it's sonic result is as you describe.
The sound demos on YT sound amazing. Very inspiring. Would pair nicely with a Torpedo Reload, Fryette Power Station, or BadCat Unleash!