Not familiar with the operations of this existing preamp, but I would want to check for HT bypass setting or unity gain settings, that neither are activated.
I have a spare amp with a gain control for each channel. On the rare occassion that I use this amp in my system, I just set both gain pots to 100% and control the volume from my preamp. In other words, as mentioned above, you do need to have these gain setting controls on the amp turned up for the preamp to play through that amp to your speakers. You cannot set the gain to zero on the amp and expect the preamp to produce music through this amp to your speakers.
Also, if you bought the BAT preamp used, have you re-set it to factory settings? Have you opened it and made sure the tubes are installed?
I have a spare amp with a gain control for each channel. On the rare occassion that I use this amp in my system, I just set both gain pots to 100% and control the volume from my preamp. In other words, as mentioned above, you do need to have these gain setting controls on the amp turned up for the preamp to play through that amp to your speakers. You cannot set the gain to zero on the amp and expect the preamp to produce music through this amp to your speakers.
Also, if you bought the BAT preamp used, have you re-set it to factory settings? Have you opened it and made sure the tubes are installed?