peavey heritage vtx mods

  The PDF version of this file prints at correct 1:1 scale to be used in my laserprinter/epoxy panel art system, as follows: The paper is cut into three 1.75-inch high strips (actually, cut just under size, inside the marked lines), and fit across the front panel of the new addition (extruded L-section aluminum), strips being cut to suitable lengths to nicely fill the 25-inch wide panel. The strips are adhered to the panel with a thin layer of clear two-part epoxy, and then a relatively thick layer of epoxy is poured and spread over the top, forming a smooth and consistent layer due to gravity and surface tension. The panel is drilled after the epoxy has set for at least several days, or perhaps a week or more.

 

  Peavey Heritage VTX modifications The schematic shows the new circuitry, plus just the relevant bits from the original VTX schematic, showing where the new circuit is tapped in.  I posted a link to the full VTX schematic, in an earlier page. * add two new 12AX7 preamp tubes, housed in new chassis located underneath existing chassis. * disconnect existing VTX solid state drivers from 6L6 cathodes. * connect all four 6L6 cathodes to gnd. * disconnect VTX dc voltage circuit from 6L6 grid inputs, preserving input resistors. * cut existing connection between positive and negative phase inputs (6L6 pairs). * connect phase inputs to new V6 12AX7 phase inverter circuit outputs. * connect power transformer HV center tap (low-power setting) to new phase inverter bias circuit. * connect feedback line from the 4 Ohm output transformer tap, to new presence and depth (resonance) controls associated with V6 circuit. * connect +525v HV source to R-C power supply ladder for the two new 12AX7...