Hello All,
I have a 19-year-old Mark Levinson model 431 power amplifier. After sitting unused for about 2-years, I wanted to compare it to my current amplifier. I powered it up for a few days to let it warm up. While checking the input and output to adjust gains for the two amplifiers, I noted a -140mV DC at the input, the output was 0VDC. Both channels measured the same.
My question is, can that be considered normal? The manual says the input is a balanced topology, but I use it in single-ended mode. I noted that if I add a load (if that is the proper term here) of about 1K, the DC goes to zero.
Thanks for any help
Cheers,
ceulrich
I have a 19-year-old Mark Levinson model 431 power amplifier. After sitting unused for about 2-years, I wanted to compare it to my current amplifier. I powered it up for a few days to let it warm up. While checking the input and output to adjust gains for the two amplifiers, I noted a -140mV DC at the input, the output was 0VDC. Both channels measured the same.
My question is, can that be considered normal? The manual says the input is a balanced topology, but I use it in single-ended mode. I noted that if I add a load (if that is the proper term here) of about 1K, the DC goes to zero.
Thanks for any help
Cheers,
ceulrich
When both inputs measure the same, it’s perfectly o.k.
The input transistors are drawing their base currents from 49k9 resistors, so -140mV means ca. 3uA.
Hans
The input transistors are drawing their base currents from 49k9 resistors, so -140mV means ca. 3uA.
Hans