These are cathode bias amps. How would one adjust the plate dissipation, or is that purely a function of component values in the circuit?Note: the biasing in these amps makes all the difference in the world...as with any amp. IF the tubes in one of these run to the cooler side versus tubes that run to the hotter side, the amp's sonics will differ greatly from what that same amp would sound like with hotter tubes.
My point being that unless one has the same plate dissipation going on in two amps of the same circuit, then the two amps will not exhibit sonic commonality, ime.
Amp demos/comparisons.....I have seen only one comparison of amps on the 'net that gave me any ground upon which to make any judgement. They paid very close attention to playing the exact same riffs, chord passages, whatever at the same dynamic levels from amp to amp. ONE could actually tell the differences.
This is kinda off topic...The 20112 is great but I would go for the Ivy League now that I own a Harvard.
Great little amp
Sorry guys.i just found it to stay a little tighter than the deluxe. Tone is also a little brighter to my ears. Not as much mid range.This is kinda off topic...
but why do you say that? Thought the Harvard/Ivy League was a lot harder/stiff sounding comparatively?
RJLII, yes, these are cathode biased amps. The biasing is accomplished by the resistance of the bias resistor and/or the performance specs of the tube. Not all tubes are created equal...hence the 'matching' that we demand today. You could order 5 duets of tubes--from the same manufacturer--- that were matched in pairs with each pair having different performance specs compared to the other pairs. Each pair would yield a different level of plate dissipation in the circuit, and a different level of plate dissipation would yield a different sonic. The extremes to each end of the range of those 5 pairs would be much different in comparison to each other.These are cathode bias amps. How would one adjust the plate dissipation, or is that purely a function of component values in the circuit?