Hiwatt Tube Combo P18C
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Manufacturer Information
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Algam SAS
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Historical Context and Positioning in the Range
Inspired by classic 1960s British EL84 circuits, the P18C modernizes the 18 W formula by adding multi-level attenuation and a convenient channel chaining feature. It positions itself as a compact "club/studio" combo, more portable than a head + cabinet setup, without sacrificing character or usable volume on stage.Who This Amp Is For
Ideal for intermediate to advanced guitarists seeking a responsive and expressive amp. In the studio, the attenuation allows pushing the tubes without disturbing neighbors. In rehearsals and on small to medium stages, the 18 W provide sufficient level with a nice presence in the mix. Its natural playground covers blues, classic rock, indie, pop, and roots, from slightly gritty clean tones to sustained crunch.Technical specifications
| Effects | Effects | Category | Amplifier |
| Category | Guitar combo | Number of channels | 2 |
| Technology | Tubes | Speaker diameter | 12" |
| Input | 4 x jack | Number of speakers | 1 |
| Output | 2 x jack | Speaker model | Celestion-Greenback |
| External cabinet output | Yes | Headphone output | No |
| Amp tubes | 2 x EL84 | Color | Blue |
| Pre-amp tubes | 3 x 12AX7 | Finishing | Black tolex |
| Cabinet | Straight | Power output | 18 W |
| Cabinet impedance (Ω) | 16 Ω | Weight | 19.5 kg |
| Attenuator | Yes | Dimensions (mm) | 580 x 290 x 535 |
Questions frequently asked
Can the Hiwatt P18C be used at low volume at home?
The built-in attenuator selects 18, 7, 1, or 0.5 W to adjust the sound level to the environment. The 0.5 W position allows the tubes to be driven at a reduced volume.
What sound does the combo produce with its Celestion Greenback?
The 12-inch Celestion Greenback speaker provides smooth mids and tight bass. The 2 EL84 tubes deliver bright cleans, then dynamic crunch and singing saturation depending on the volume setting.
How do the two channels and Cascade mode work?
Each of the two channels has its own Volume and Tone controls, with a High and a Low input. The Cascade switch links the channels to increase gain and harmonic density. A tremolo is also built-in, with speed and intensity controls.
Can an external speaker cabinet be connected to this combo?
Two 6.35 mm jack outputs are provided for an external speaker, with an impedance selector for 8 or 16 ohms. The internal speaker has an impedance of 16 ohms.
Is the P18C suitable for rehearsals and small gigs?
Its 18 W and 12-inch speaker are specified for rehearsals and small to medium-sized gigs. Weighing 19.5 kg and measuring 580 x 290 x 535 mm, this combo format remains designed for transport to club or studio settings.



