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In Reply to: RE: Initial Report, Film Cap 180 degree orientation - Employing new-style Clip Leads posted by Lew on August 18, 2016 at 10:54:08
How the film cap is wound does not GUARANTEE what will sound best in the circuit. Sorry doc, there is no " route " way to obtain what I seek, other than DOING and LISTENING. That is a point of my post. No free lunch. Do the work and enjoy.
Clip leads are a big degrade, the Mil Spec wire, and Mueller 60C alligators help a little, but I am very aware of the clip lead effects.
Jeff Medwin
Follow Ups:
That would be useful information, if that's what you found, but I thought you wrote earlier that you were not checking the capacitors for the location of the lead connected to the outer foil (which I found out anyway was a frustrating task for 10uF and higher value film capacitors). Anyway, since you have not correlated your findings with anything except subjective judgement, how can you make this latest claim? (Not that I object to the idea of doing it by ear per se.)
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: 08/21/16
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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