Our high-gain tube preamp kit – Z-PRE – is based on London Power’s Zen amplifier – a high-gain monster built for shredders and modern guitar soundsmiths.
Modern high-gain guitar sounds are easily produced with a pair of 12AX7 tubes in a cascaded four-stage preamp. This Soldano-like circuit uses any 12A_7s, with maximum gain achieved by fitting two 12AX7s. Use lower-mu tubes for less gain and smoother tone.
Local supply decoupling is included. 6V and 12V heater wiring is accommodated.
Combine the Z-PRE with our F-PRE Fender-style Preamp Kit for a clean sound; or with M-PRE British-style Preamp Kit as a clean or rhythm sound, selectable using our ERK Electronic Relay Kit or Q-system switching kits.
The board has silk-screening on both sides which allows you to stuff the components appropriately for INTERNAL or EXTERNAL TUBES. For INTERNAL, all the components are on the same side of the board; for EXTERNAL the components are on the opposite side from the tube sockets.
Power requirements: 12V-300mA or 6V-600mA; plus 320V-4mA
Use PSU-PRE or similar to build a stand-alone preamp.
Combine with AMP-25 to build an integrated amp.
Configurations available for purchase:
Standard DIY kit (PCB + resistors + tube sockets + caps + notes) (Z-COMP)
Pre-assembled kit – configured for Internal tubes (Z-INT)
Pre-assembled kit – configured for External tubes (Z-EXT)
Hard-to-find parts only (Z-HP)
PCB + notes only (Z-PCB)
Notes include installation instructions with layout and schematic diagrams of the kit.
For more info on London Power Preamp kits, see our Selecting a Preamp Kit page.
PCB size: 4.5″ x 1.5″ , 115 x 38mm