Os caps Sozo, que são enrolados a mão, vem com uma marca (linha)
do lado que deve ficar "apontando" para as válvulas na montagem da
placa de turrets.
http://www.sozoamplification.com/purchase_vintage.htmlMas eu acho que é tudo coisa da cabeça desses mojistas loucos.
Abraços.
A explicação que é dada no site da Sozo:
What is the black line on the mustard standard and vintage capacitors for? Are your caps polarized?
No the capacitor is not polarized, the black line indicates the outside foil of the capacitor.
Which direction should the outside foil go?
My rule would be: Connect the outside foil terminal of the capacitor to the lowest impedance side of the circuit. For coupling applications, orient the capacitor so that the outer foil connects to the "incoming signal" and the inner foil to the "output" side of the circuit. Signal sources are almost always lower impedance than signal loads.
For tone control circuits it is not as simple to define the signal in and signal out terminals of the capacitor. Tone control circuits operate with significant AC voltages across them. For the case where one end of the capacitor is grounded [simple treble cut circuit] the rule breaks down. The signal source should not be connected to the outside foil in this case; the outside foil should be connected to ground.