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In Reply to: RE: "How the film cap is wound does not GUARANTEE what will sound best in the circuit." posted by Lew on August 20, 2016 at 14:29:39
Lew,I MAY, in the future, go and gain SOLID experience measuring for the outer foil. Afterwards - I might disassemble the leads from this amp, and test for outer foil correlations. But if I did all this work, it would be so that I can build a second amp easier ( thinking JJ2A3 DC SET, stereo ).
I am not so sure I would give the information to others, who have done LITTLE or NO work at all. That would depend upon my intent, to be 100% amateur, or sell an item or two, every now and than. I don't know the answer to that.
I should measure the already - optimized Custom ALTEC crossovers' orientations too, may be easy to do, its a large unit, easy to parts-access.
BUT, I have forged a path here for others so inclined, a guy, say, like Nickel Core !! Others, using 100dB or higher speakers, can do this work, and document foil orientations, as we have discussed herein. If they ( or you ) wanna give out your findings, that is up to them.
Its sorta COOL when you do film cap orientations unprejudiced, 100% by ear. But its sorta smart IF you were to test for outer foil first, and NOT let that testing prejudice your listening determinations.
Lew. The adding of " more wire " within spans of this DC amp was a BIG thing, in terms of fleshing-out the music, and getting maximum dynamic contrasts. So EZ to hear on A7-800s !!! Warning !!! - too much wire SLOWS the pace, and loses the timing, and De Highs!!
I FINISHED wire and orientation of my right channel last night. I had the high gain ( 1/2 12AX7 ) Driver stage's Rk bypass cap 180 degrees BACKWARDS, and, being a dominant tube, with most of the amp's gain, it was EASY to A-B that. The presentation became " more real sounding " to me, guitar strings in the background became more realistic, when I reversed it and Wonder Soldered it in place.
I am getting WEARY of all this work. I have been " busting my chops " ( self-imposed) on building this ALTEC VOTT system, " as good as I can ", since I got the 825 VOTT enclosures last December. I spent all of 2015 listening to 515B woofers full range !! One night this week I had a wire-span idea while lying in bed, got up at 3 AM and listened till 4:20 AM !!
Right now, I wanna finish the Left channel, and hear music at home, maybe invite some of my friends from Church over to hear it. I am VERY impressed with this simple two-way ALTEC. Love the horn loading's effect on the 515B woofer.
So many ALTEC A7 VOTTs are done wrong !!! A shame.
Jeff Medwin
Edits: 08/21/16Follow Ups:
These days, after arriving at a very satisfactory place with my two audio systems, I am quite content to listen to music and fuhgeddaboudit. But not always; I still get the occasional itch. I definitely would not do what you tell me you do, however.
Lew,
I'm 71 and I intend this VOTT A7-800 to be my final big system. My parents lived till their mid 90s, but.... one never knows !!!
BUT, I really wasn't sure the A7-800 would be acceptable until about a month ago, after working on it since December 2015, with the ALTEC drivers in the enclosures. This is taking EVERYTHING I knew of, in audio, to get it to go !!!
About a month ago, I started to get the "feeling" it MAY work out - to "my" satisfaction. Within the past few weeks of my working, re-building my SET 45 amp, I am now confident it will be very acceptable ( AKA " Killer " ).
My Dynamics have Dynamics, getting good timbre, and the 45 amp plays the A7 and plays it like its 1,000 plus watts, not 1.5. ( LSES and wiring ).
Regards.
Jeff Medwin
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