Dover, It is always essential when considering use of a passive pre to consider both the amp and the sources. One must be very careful about system matching, although TVCs in some ways can be more forgiving than other passive designs.
In the 1K price range for preamps, there are necessarily going to be tradeoffs. The Promitheus TVCs can be a steal if the rest of the system lines up. I don't know the Dyanaco amps. The OP should consider your experience with those amps carefully.
In the 1K price range for preamps, there are necessarily going to be tradeoffs. The Promitheus TVCs can be a steal if the rest of the system lines up. I don't know the Dyanaco amps. The OP should consider your experience with those amps carefully.