electronaut
Well-known member
Hello peoples,
Just curious about the choice of the LL5402 for the G9... The spec sheet for the LL5402 says "Optimum source impedance = minus 15 ohms".
I wired up an LL5402 in every possible configuration and could not get frequencies less than 30 Hz to pass without significant distortion, when driven from a 600 ohm signal generator. When I asked Kevin Carter (Lundahl distributor in U.S.) about this, he said,
"The source impedance of your generator is just too high to produce "valid" results. The transformer is designed for low source impedance drive. Ten or so ohms will work nicely. Normally these transformers are used in circuits with op amp type topology, where the drive impedance is very low due to feedback."
So, assuming the SRPP stage in the G9 is not considerably less than 600 ohms, how is the G9 able to get around this problem?
Just curious about the choice of the LL5402 for the G9... The spec sheet for the LL5402 says "Optimum source impedance = minus 15 ohms".
I wired up an LL5402 in every possible configuration and could not get frequencies less than 30 Hz to pass without significant distortion, when driven from a 600 ohm signal generator. When I asked Kevin Carter (Lundahl distributor in U.S.) about this, he said,
"The source impedance of your generator is just too high to produce "valid" results. The transformer is designed for low source impedance drive. Ten or so ohms will work nicely. Normally these transformers are used in circuits with op amp type topology, where the drive impedance is very low due to feedback."
So, assuming the SRPP stage in the G9 is not considerably less than 600 ohms, how is the G9 able to get around this problem?
