Moderators: pompeiisneaks, Colossal
Fender used the parallel V1 in several "II series" amps, such as the Deluxe Reverb II and Concert.iknowjohnny wrote:Rob, here is a 18 watt showing a parallel stage ...
http://mhuss.com/18watt/schematics/18minwatt.gif
yes it is cleaner, but most times guitarists dont want cleaner, we want harmonic complexityiknowjohnny wrote:Think i'm gonna pass on this one. Tried it on V1 and now i have it back to 3 stages no parallel and i think it's just cleaner and better like that. Well, learned something anyways. Thanks all.
Merlin made a comment some time ago about parralell stages adding more high order harmonics.. maybe I am remembering it wrong though? Thanks. That helps to clear things up, in my mind...iknowjohnny wrote:Rob, here is a 18 watt showing a parallel stage ...
http://mhuss.com/18watt/schematics/18minwatt.gif
FWIW in Merlin's 1st book (on preamps), there is a chapter on parallel stages where there are a few different ways of implementing them for different effectsguitarmike2107 wrote:yes it is cleaner, but most times guitarists dont want cleaner, we want harmonic complexityiknowjohnny wrote:Think i'm gonna pass on this one. Tried it on V1 and now i have it back to 3 stages no parallel and i think it's just cleaner and better like that. Well, learned something anyways. Thanks all.
Actually that wasn't a good description. (cleaner) I can't quite explain, but more strident and less smooth....i guess harsh almost describes it for the most part. But if anything i felt it lacked as much complexity as the no paralleled circuit which was a big reason i changed back, so maybe it was the longer wires and interaction or something. I dunno, but i have a box of sozos waiting at home so right now thats all i care about ! been wanting to try these forever.tubeswell wrote:
yes it is cleaner, but most times guitarists dont want cleaner
No I didn't say that.iknowjohnny wrote:Actually that wasn't a good description. (cleaner) I can't quite explain, but more strident and less smooth....i guess harsh almost describes it for the most part. But if anything i felt it lacked as much complexity as the no paralleled circuit which was a big reason i changed back, so maybe it was the longer wires and interaction or something. I dunno, but i have a box of sozos waiting at home so right now thats all i care about ! been wanting to try these forever.tubeswell wrote:
yes it is cleaner, but most times guitarists dont want cleaner
Merlin does touch on this but one of the cool things to do with a paralleled triode is to have them share a common load resistor but dissimilar bias resistors and bypass caps (if applied). Bias one cathode warmer (such as 680-820R) and other cooler (say 1k5-2k7) for harmonic complexity; let the common grids fight it out over the bias point. With a paralleled setup there is only a slight boost in gain over a single triode but reduced noise with half the load. You could use classic Plexi values such as 820R/330uF and 2k7/0.68uF and the common anode mixing arrangement acts like maxed Bright and Normal channels. You could add a pot in series with the 330uF to ground to act as a Bass control.FWIW in Merlin's 1st book (on preamps), there is a chapter on parallel stages where there are a few different ways of implementing them for different effects
Have you tried this and if so whats your opinion on it?Colossal wrote:Merlin does touch on this but one of the cool things to do with a paralleled triode is to have them share a common load resistor but dissimilar bias resistors and bypass caps (if applied). Bias one cathode warmer (such as 680-820R) and other cooler (say 1k5-2k7) for harmonic complexity; let the common grids fight it out over the bias point. With a paralleled setup there is only a slight boost in gain over a single triode but reduced noise with half the load. You could use classic Plexi values such as 820R/330uF and 2k7/0.68uF and the common anode mixing arrangement acts like maxed Bright and Normal channels. You could add a pot in series with the 330uF to ground to act as a Bass control.FWIW in Merlin's 1st book (on preamps), there is a chapter on parallel stages where there are a few different ways of implementing them for different effects
