phoph amplifiers

Audio / objects / experiments

The Field, open, seen from above: copper busbars, graphite modules, the transformer at the centre of the plate

F-00 — The Field, rev 03, open. Busbars in copper, modules in graphite, the light only where something is happening.

Copper is structure. The light is state.

Field — rev 03, on the bench

Six boards · one released, one in placement, four to route

Journal

Nothing is finished yet. This is where I write it down.

Design updates, notes from the bench, and the details that take a fortnight to get right. In the order they happened.

The Field build, in order →

All entries

Build

Measurement

Decision

Mistake

Object

  • Volume control: the stepped ladder attenuator
    Henk

    Volume control: the stepped ladder attenuator

    Twelve resistors, seven relays and no wiper on any track, that is the attenuator board. It has one property to get right,…

  • The design maths of 25 W
    Henk

    The design maths of 25 W

    Twenty-five watts is early in the watt spectrum, an adolescent number. Every part of this machine is a consequence of it: ten…

  • Half a century of electronics
    Henk

    Half a century of electronics

    A crystal receiver in a kitchen, fifty years of detours, and one small amplifier that has to be repairable by somebody who…

  • phoph pebble
    Henk

    phoph pebble

    I have lots of ideas for phoph but want to start where I left of in 2017. A hybrid tube amp, low…

  • The LEAR Amp
    Henk

    The LEAR Amp

    in 2017 I designed the LEAR Amp. A small tube amplifier built in two parts, a power supply and the amplifier itself.…