bdhact1 wrote: waldo041 wrote:
bdhact1 wrote:After making a vintage distortion + from schematics and PCB photos, I've found when breadboarding all the components that the biggest difference in sound on the vintage Dist + was the tantalum capacitors. The 25v volt tantalum had a thinner sound than the 35v. The 35v was a little more beefier. According to photos of vintage distortion Plus PCBs, MXR seemed to use both types from one box to another. A point of reference I used for Jerry's Dist + sound was the instrumental bonus track of "Peggy O" from Terrapin Station. That sound was duplicated with the 25v tantalum capacitors. I decided to install a switch to go from one type to another.
what other types of swaps did you try besides the tantalums?
Thanks for asking Waldo,
I studied all the schematics and photos I could find on the vintage Distortion Plus. Naturally 1n270 diodes are a definate prerequisite; And I wanted to sound as authentic as possible. I was lucky right off the bat finding a period C741CP opamp, a couple of .050 ceramic capacitors, and a a few vintage ceramic capacitors from old 60s and 70s flea market stereos. I was curious as to how other types of capacitors would sound. So I tried box metal film, regular metal film, polypropylene film, electrolytic, and even Orange Drop. They all were just too smooth or dull sounding They just didn't have the "byte" of ceramic, or the tight grit of tantalum. The 2 tantalums made the most difference, especially between the 1uf 25v and the 1uf 35v. All the schematics and PCB photos showed both voltages were used. One schematic had them both listed an the same unit. I had read that they were hand made at the time and they used what ever stock available to them.
The ceramic .050 made a slight, distinct difference in the clipping stage, but nothing dramatically different. Carbon comp resistors made too little difference so I stuck with metal film.