The Caline CP-29 White Heat is a boost pedal from Caline, a maker with a wide range of affordable overdrive and boost pedals. It raises your signal level and adds a small amount of grit along the way, rather than acting as a completely clean volume lift1.
What it does
The clearest description of the pedal comes from the Guitar FX Layouts blog, which published a DIY vero and tagboard layout for the circuit in December 20221:
"Boost with grit. Basic, but not exactly like all the others out there."
In other words, it sits between a pure clean boost and a light overdrive: it pushes your amp or the pedals after it harder, while adding a touch of its own character1.
The Level control and its taper
The pedal's Level control is the one detail of the circuit that has been documented in public, and the documentation points in two directions on the potentiometer used: the schematic calls for a B100K pot, while board photos of an original unit show an A100K1. The taper in the original unit is logarithmic, and one builder who reconstructed the layout reports it works as expected, as a boost with a bit of grit, using A100K for both pots1.
| Where it appears | Pot value | Taper |
|---|---|---|
| Schematic | B100K | Linear |
| Board photos of the original unit | A100K | Logarithmic1 |
The blog notes the pot is logarithmic in the original unit. A builder who constructed the layout in February 2023 reported that it worked as expected, as a boost with a bit of grit, using A100K for both pots1.
The name "White Heat" is also used by Hudson Electronics for a separate, hand-built pedal constructed from scratch on vintage-style stripboard with high quality components and CITEC longlife pots2. The Caline CP-29 and the Hudson Electronics White Heat are different products from different makers.
Where it sits in Caline's range
Caline makes a large family of boost and overdrive pedals, and the White Heat is one of several options depending on how much drive you want:
- The CP-97 Recluse Boost, a dedicated boost that also appears as the boost side of Caline's dual pedals
- The CP-43 Pegasus Overdrive, a Klon-based overdrive and boost
- The CP-99 Medusa, a Klon-inspired overdrive and boost built on the Pegasus
- The CP-79 Wolfpack, a Tube Screamer circuit with an added boost section
- The G-011 Eagle Eye Boost, a compact boost in Caline's smaller casing
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Questions
What does the Caline White Heat do?
The Caline CP-29 White Heat is a boost pedal that adds a bit of grit along with the level increase. The Guitar FX Layouts blog describes it as a boost with grit, noting that while it is a basic circuit, it is not exactly like all the other boosts out there.
What potentiometers does the Caline White Heat use?
The Level control uses a B100K pot in the schematic, but board photos of the original unit appear to show an A100K, which is a logarithmic taper. A builder who constructed the circuit with A100K pots for both controls reported it worked as expected.
Sources (2)
- Guitar FX Layouts: Caline CP-29 White Heat, Guitar FX Layouts (tagboardeffects.blogspot.com), 2022-12-13
- WHITE HEAT, Hudson Electronics UK
