Sven wrote:Greetings,
OK, fine, now I understand. Well, the parallel effects loop seems to be the way to go if one does not wish to loose some of the qualities of the valve amp sound ... and even more so in designs where there is an attempt to get a special high quality sound, such as in Dumble models.
Having the entirire signal go through just about any pedal, that is, leaving it to the ¨mercy¨ of the pedal electronic network, is a loosing proposition in many cases. For that reason alone, one might as well use the pedal up front, and than run the signal from the pedal into an amplifier input, and forget about the whole FX loop deal, pretty much ....
Particularly with pedals that add delay or reverb, one is always compromising the final sound if one runs delayed and/or reverberated signals through the amp. In live concert and in studio situation, one would be much better off if one would run the dry amp sound and have the mixing engineer add delay/reverb effects. However, that is not always possible nor practical, even on the big stages and sometimes even in studios ...
Some guitar players who really care about tone very much, would run DI-out from one amp into another amp that would handle the delay-reverb effects (for example, that is what Brian May did). Such scenarios call for two amps, of course. So, in a one-amp scenario we are returning back to a parallel effects loop, as described in my first posting.
Can we look around for a solution of implementation of such a parallel FX loop, in a Dumble circuit.
One more question. Since pre-amp gives signal enough boost to drive any effects pedal (if guitar can do it, than pre amp boost can actually be too much), why is it neccessary to use valve amplification in FX loop of present (serial?) scheme, or is it for impendance matching and some other issues beyond the actual strength of a signal?!
But, having a parallel loop with ability to ¨mix-in¨ a bit of wet signal from delay and/or reverb pedal, is not really a cure-it-all solution, since even a 10% of mixed-in signal can spoil the dry signal in some ways due to phasing or whatever problems end up surfacing in the summed, final singal that goes to the output stage. In Dumbles, also, such an FX loop would have to be introduced after OD stage, since it would be somewhat weird to delay a clean signal and have the dry signal be overdriven ...
Once again, it would be nice to make a parallel loop for Dumble and see how it works and how it sounds overall ...
All the best,
Sven
i`ve built a Dator with a MIX control, just add a 47K plate to the cath follower stage ( PLATE side) , cap coupled, then 1m to grnd, to a MIXER pot, take the return sig to one end of pot, MIX sig to other end, wiper out to the RTN volume.....works like a freakin charm.......... found out that Zinky amps have a similar set-up..
