how to build up Balanced input for valve amplifier
let's me show you 2 type of balanced input schematic.one is input transformer
and two is differential amplifier can do easly.unbalanced out to balanced out
is almost using OP Amplifier and Transformer easly .cable is shown next
Balanced Cable like above 2 of white and 2 of blue and ground
cut cable ,you can see 4 wire and shield
2 of blue and 2 of white wires ,can see
blue wire conected each other and white wire conected each other.
blue wire should be conected No2(hot) and white wire conected with No3(Cold)
and shield is should be going to No1(Ground) of Balanced conector.circuit is next
old euipments are Pin 3 is hot but recently pin 2 is using for HOT.un balaced(RCA)
cable can not use for long cable but balances cable can do,S/N is good result when
using cable is long.ex) in generally RF cable has around 68pF of capacitor or more
so loss audio signal and has risk with noise from sirface of cable.balanced type
cansel noise when out put has balanced type.
with differential valve amplifier,OP AMP IC'S is more easy
XLR Balanced D.I.Y
