chris_sanford wrote:
Don't think so. Tail resistor on the mid pot looks more like the Bluesmaster TS (think Marshall style).
chris
Correct me if I'm wrong, but I don't ever recall seeing a Marshall tonestack with a fixed resistor to ground off the Midrange control. I'll look at my Doyle book again.
Don't get hung up on the 'tail' resistor.. that's of fairly low value, and only really comes into play when the mid pot is turned all the way down. My point in calling the TS 'Marshall-style' is that the mid pot is stacked in series with the bass pot, similar to, well, Marshalls and Fenders... as opposed to the 'normal' Dumble stack, where the the bass pot is wired in *parallel* to the mid pot. The values I have seen for the Bluesmaster stack are 47k slope, 250k treble and bass pots, 50k mid. Bass and Mid caps are .022, treble is as per HRM with the mid boost setup.
kleinm wrote:BTW - you can see in the picture that the Midrange pot is an Alpha 250k. Again, this isn't a Marshall-style midrange value that I'm aware of.
Never take what is printed on the outside of a pot as gospel.. at least not when it comes to Dumbles. You have to measure them!
chris_sanford wrote: My point in calling the TS 'Marshall-style' is that the mid pot is stacked in series with the bass pot, similar to, well, Marshalls and Fenders... as opposed to the 'normal' Dumble stack, where the the bass pot is wired in *parallel* to the mid pot.
Just trying to learn here....
How are you able to see that the Midrange control is wired series to the Bass, rather than the quintessential Dumble parallel? It appears obscured in the photo. Are there other indicators?
kleinm wrote:
How are you able to see that the Midrange control is wired series to the Bass, rather than the quintessential Dumble parallel? It appears obscured in the photo. Are there other indicators?
You can't see any other indicators in this picture (or at least I can't!). My clue was that the tail resistor on the mid pot is similar (along with the Marshall PI) to other amps I have seen or heard about. Funk also noticed something important though.. the PAB resistors are ground referenced. Now the only reason I can see to do this would be if the bass pot was no longer connected to ground (forgetting the usual tail resistor for the moment).
Sure, the amp in question might have two tail resistors, or some new type of tonestack.. we don't know, unfortunately. But if I were a betting man...
Funkalicousgroove wrote:So what about the PAB and Rock/jazz?
Both those modes would still work fine. They would sound different, of course. The 47k slope would make the mid control more 'active' in PAB mode, which might be a usefull thing.
well, I was looking at some pictures, and it looks like the "Poles" of the Rock/Jazz switch actually connect to their respective pots instead of the PAB board
Funkalicousgroove wrote:well, I was looking at some pictures, and it looks like the "Poles" of the Rock/Jazz switch actually connect to their respective pots instead of the PAB board
Hmmm... your eyes must be better than mine! It looks to me like both the poles (yellow, clear wires) connect to the Jazz/Rock switch as per usual. ??
Possibly Dumb question guys but, what type of D style amp is Carlos Santana playing these days? I realize he doesn't have quite the same sound as Larry or Robben. Given when he started using these amps I just assumed he was playing HRM styles.
I'm not sure I am hearing the M style or how did you put it Norm, monkeysound? Can we use Jim's last name here?
Anyway is Carlos just playing an 80's style amp, it just sounds closer to an older amp sound to me but it has been very casual listening, usually on the radio, not studio quality monitors comparing tones?
Can we use Jim's last name here?
