JOHN HORNBY SKEWES: Selectatone TB2 Treble and Bass Booster, Tag Board Layout

JHS selectatone tb2 tag board layout v1 98bc5b238e14

While on the JHS thing, I noticed this booster and thought it looked interesting.  The output switches between filters to allow for treble and bass boost, unlike most other boosters where it all happens at the input. Very few seem to be around, as I could only find one photo of the internals and one video … Read more

ANALOG MAN: Beano Boost

ANALOG MAN Beano Boost tag board layout v1a 13a898fe84fa

The Analog Man Beano Boost takes the classic Rangemaster treble booster and adds a very useful function — a switched input capacitor that widens the tonal range beyond the original’s treble boost. Because it’s a single-transistor germanium circuit, the choice of transistor does shape the tone and clipping character, especially at higher gain settings.  That … Read more

Fulltone 2B

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 Happy 2022, everyone! Here’s a buffer/booster from Fulltone. Engaged it’s a booster with an interesting controllable germanium soft clipping setup, and when bypassed the diodes and gain control are shorted, creating a buffer. If you’re just after the boost and want to skip the buffered bypass, just ignore the two Bypass pads and wire it … Read more

EARTHQUAKER DEVICES: Bows

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The Earthquaker Devices Bows is a straight-up germanium Rangemaster with some modern tweaks.  It uses an NPN transistor and has a switch to swap to a larger input capacitor for a full-range boost. The space above the transistor on this layout allows it to be mounted on its side (bent over 90 degrees), as OC transistors are … Read more

REVOX: A77 Input Amplifier Clean Boost, Overdrive / Light Fuzz

REVOX A77 61f0fa4ffd0e

This is the input amplifier from a Revox A77 reel to reel (circa ~ 1967) – which also happens to be almost identical to the mic preamp in Trident A-Range mixing consoles from the early seventies. So far out of the preamps that I’ve been working on, which is the Neve, RCA and this, I’m … Read more

DALLAS: Rangemaster, Tag Board Layout

Dallas Rangemaster tag board layout v1a fb8ca688d581

A bit of a classic – well one of the first guitar effects really, the Dallas Rangemaster.  A nice simple one for a quick build using leftover tag board.    In theory there is room to fit the output cap on the board too, but I liked the straight lines of the components.   DALLAS RANGEMASTER TREBLE … Read more