Hi
I am upgrading caps in my Valve/Tube pre amp to V-Cap ODAM.
Web site says this under Installation Notes
" The short lead indicates the outermost foil, and should be connected to the lowest impedance path to ground. Another way to identify outer foil is the writing on the label flows towards the outer foil. "
Is the lowest signal path, simply the way the signal is traveling though everything Preamp, Amp, Crossover?
Or is it the other way the return? or does it change and something I should test for each placement.
Would like to the work once and learn at the same time.
Eddie18
Installation Notes
https://www.v-cap.com/installation-notes.php
I am upgrading caps in my Valve/Tube pre amp to V-Cap ODAM.
Web site says this under Installation Notes
" The short lead indicates the outermost foil, and should be connected to the lowest impedance path to ground. Another way to identify outer foil is the writing on the label flows towards the outer foil. "
Is the lowest signal path, simply the way the signal is traveling though everything Preamp, Amp, Crossover?
Or is it the other way the return? or does it change and something I should test for each placement.
Would like to the work once and learn at the same time.
Eddie18
Installation Notes
https://www.v-cap.com/installation-notes.php
Well, for me it means a copper ground bar with the short lead properly attached to it along with any other grounds as there's no such thing as too good a ground.
In signal coupling you simply connect the foil to the lowest impedance node. So if it's a valve amp with a cap coupling from anode or cathode of one valve to the grid of the next stage then the foil goes to the anode or cathode.
If it's a cap in a feedback network then the foil normally goes to the end of the cap 'being driven' as that is normally the lowest impedance point.
Think of it this way. If you were to touch with a screwdriver each end of the cap (to deliberately 'buzz' the stage and introduce hum) which end of the cap would get you the loudest buzz. That would be the high impedance end.
If it's a cap in a feedback network then the foil normally goes to the end of the cap 'being driven' as that is normally the lowest impedance point.
Think of it this way. If you were to touch with a screwdriver each end of the cap (to deliberately 'buzz' the stage and introduce hum) which end of the cap would get you the loudest buzz. That would be the high impedance end.
This is a good learning resource: https://www.aikenamps.com/index.php/where-to-connect-the-outside-foil-on-capacitors
Well, the only way to really know is to do it both ways. The capacitor leads don't need to be cut and wrapped on the terminal for a simple test. Just tack soldered with the already stripped ends is alright for a few hours one way and a few the other. Live a little and change one place in the circuit at a time and really hear not only what the capacitors do but what each position change does, if anything.
At a minimum cost of $70 each I'd think your ears are good enough to warrant the experiment , (even if there turns out to be no audible difference!).
At a minimum cost of $70 each I'd think your ears are good enough to warrant the experiment , (even if there turns out to be no audible difference!).
I'm lazy, I use a DMM with a fresh battery and clean leads. Ohms, Clamp the lead and touch the outside of the cap
The lowest reading is the outside of the winding. It > goes away from the positive or towards the negative. This is
an old mechanic talking ok. Don't beat me up. 🙂 Tear the cover off see for yourself. Even the Deulund bypass caps have a noise rejection direction. cha, cha, cha,!
Large boutique caps can be noisy(er) one direction vs the other. Most builder or guys that modify "STUFF" use that as a guide line.
I suppose it a personal QC issue.
Regards
The lowest reading is the outside of the winding. It > goes away from the positive or towards the negative. This is
an old mechanic talking ok. Don't beat me up. 🙂 Tear the cover off see for yourself. Even the Deulund bypass caps have a noise rejection direction. cha, cha, cha,!
Large boutique caps can be noisy(er) one direction vs the other. Most builder or guys that modify "STUFF" use that as a guide line.
I suppose it a personal QC issue.
Regards