To build a single-ended speaker-output amplifier, you need is one assembled preamp module, and one assembled output tube module. To build a preamp stage, all you need is one assembled preamp module (which contains two preamp stages).

How low B+ can be depends on the preamp tube used. If you don't build them into existing amplifiers, you need to provide a power supply that provides filament (6.3VAC) and B+ of up to 300VDC maximum, down to maybe 24VDC or so. These modules need filament and high voltage from some source. The Preamp Module hasĪ ground plane on one side to reduce interference to a minimum. The component values are left up to the builder,īut each PCB comes with a component placement diagram and schematic so you can tailor them to your application. I added one preamp stage board to a 'British' amp with wonderful results, using the filament voltage of the amp and the B+ of the amp to power it.Įach of these modules is a complete stage as found in many popular tube amp designs. It has connections for negative feedback and a presence control.īy 'stage,' I mean an amplifying stage in an amplifier. The phase inverter module is a long-tailed pair design used in many of today's and yesterday's vintage models. There are separate B+ power and ground for each triode section. One self-biased gain stage and one voltage follower stage This PCB module can be configured as either:ġ. The Modules then solder onto the back of a standard 9-pin tube socket and works with 12AX7, 12AT7, 12AU7, ECC81, ECC82, ECC83, ECC803, 7025, and their equivalents. That way you can tweak the values to your heart's content. Modules are designed so that the parts are accessible from the back of the board. New! Modules that help you build your amp or preamp project faster.

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