top of page
  • jasoneaton8

Hand Made - Pre Amplifier Section

Moving along in the amplifier build for a mono block 45 amplifier. This I call the preamplifier section as the 6SN7 is all setup for amplifying the input before the output stage to the 45. First the resistors are added for the bias control voltage supply. This turns out about 45v DC to the rheostat. Next the grid of one side and the plate of the other are tied to a reduced B+ voltage. Another setup of filter caps are added for all supplied voltages to the preamp tube. Another small filter cap added to the bias control voltage. The other plate uses the B+ voltage and then will carry over to the 45 grid. The other cathode ties to ground with capacitors and resistors. At this point we are ready for output stage assembly.

23 views0 comments

Recent Posts

See All


bottom of page