previous: Dominik Hi Gil and Andy,thanks for ... -- 4/26/2000 10:41 AM

Re: Dumb-Bell Preamp Clone almost finished

4/26/2000 5:19 PM

Gil Ayan

Re: Dumb-Bell Preamp Clone almost finished Regarding your layout, yes, it could be that you are coupling something there (capacitively). But, as you mentioned, you went for a different amp all together by including the extra tube for the buffered FX loop. According to some, the power supply is half of the sound of the amp, and if you changed it to accommodate another stage, I am sure that will change things some --perhaps for the better, of course.     quote: "I swapped the 100 k log (new style, 10 %) with a 1 M lin pot I had at hand. I played around with the trimmers as you said, but found that the overall effect of the 100k log pot was not what I wanted.   I think the 1 M pot will make the signal more compressed but that is not really a concern for me..   "     Well, the thing is that you raise the impedance of that portion of the circuitry as well. You will get more gain out of that stage (less loading on previous stage and higher resistor to ground in the voltage divider formed with the grid stopper resistor). Also, using a larger pot will lower the frequency break point of the first OD stage...     All of that put together would seem to me that your amp will be more prone to farting out that way.     quote: "BTW: the fx-loop really fatens up the signal. One can even dial in some different tones by setting the return level and send level and using the shift switches (cap across pot).   "     Agreed 100%.     quote: "I still have to get the 6,3 V DC for the filaments right (maybe thats were some of the hum is coming from)and the OD channels and Clean channels need some fine tuning. If I would do the porject again, I would only build one channel and the Fx-loop.   "     Sure, there are a number of ways you could go. Personally, though, you will never know what the real thing sounds like until you build it without any changes whatsoever -- even then, the sound may not (and probably WILL not) be "the same" as the real thing either. There is no "ultimate amp" out there, and even the best of stock amps could probably be tailored to suit a particular individual's needs. But, if I were you, I would give the real thing a listen if I got a chance, and THEN tweak it to suit your needs. If you start off with something already different, and you make changes on the fly to address the issues tha tcome up, chances are you will end up something completely different sounding after all is said and done. Again, that may was well be your ultimate amp though!     Gil

 

Replies:

Dominik Hiya Gil,Regarding the 100k... -- 4/27/2000 3:07 PM