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previous: Gus Dai was it you that was looking int... -- 10/20/1999 2:24 PM View Thread

Re: Ta caps,,,

10/21/1999 7:49 AM
Dai Hirokawa
Re: Ta caps,,,
Hey Gus,  
Yes, that was indeed I. I did eventually find two types that look like two older versions of the .22uF tants in my Turbo TS. I did some A/B testing w/other caps using a sw. to go back and forth between dif. sets of .22uF caps in a TS copy I made, and I did find that the older ones sounded very slightly better than the newer older ones, but that was only after listening very very hard. I also found some .22uF mylars ("robbed" from a late 70s solid-state amplifier) which sounded good (in terms of helping the overall sound become less harsh and making the tone control more effective in taming high end). What I really disliked were newer manufactured Tants, which had too much high freq. response(and consequent harshness). W/the new ones, I also tried using a higher value, but it didn't seem to help w/reducing harshness(one thing that I haven't tried yet was adding an inductor in series--might work to reduce harshness).  
>>I THINK I am hearing different Ta's making a change in the sound.  
The thing that seems most obvious to me (when comparing caps) is the high end(some tants add sort of a sharp, grating harshness--any harshness you might encounter doesn't seem to be solely due to the tants,just ). Is this what you're hearing? If I may, I would suggest that you trust your ears, Gus. (I'm assuming you have some years of experience w/"this stuff", and by now have a certain sense of what you like or dislike--sort of an "aural logic"). If something sounds better, go for it! If you've come up w/a great sound, it's still worth something even if you can't explain everything that is going on technically(you can do that part later as you get more info).  
Also, in my experience w/the TS circuit, the Trs used for the input and output buffers matter also(I took a hint from a Mike Fuller--of Fulltone fame--interview and tried a NPN Ge for the input, and that sounded better to my ear). The coupling caps, filter caps, and diodes also made a difference. It seemed to me that the more I chose parts that sounded less harsh, the cleaner the distortion got. If I were to take a guess as to why this was so, I would say that maybe all of the finicky-ass parts selection that I was doing resulted in less intermodulation distortion. Or maybe not, I don't really know for sure.  
Oops, guess I'm rambling again,  
Dai Hirokawa  

David Manson Tubes and transistors as diodes.. -- 10/21/1999 11:19 PM