Chepman HRM Special is our look at one of the classic American Hi Gain amplifiers, a specific iteration of the “D” circuit of the early 90s. These amps are commonly referred to as "HRM", which is an allusion to hot-native British guitar tones. The sound is usually more aggressive than Special, especially when Preamp Boost (PAB) is enabled.
The clean channel is very similar to our Legend Special, but we removed the feedback in the second stage, as a result of which the sound became more dynamic and wide.
HRM has an internal adjustable tone stack (high, medium, low frequencies) for the overdrive channel. This allows the player to fine tune the Overdrive tone to their liking. Also different from Special is that each channel has its own independent volume control.

Frequently Asked Question:” I've read that the components used in this type of amplifier are really important. What's inside my Legend?”

- We use a combination of parts, really high-quality modern parts that have passed strict selection for compliance with the design of the circuit and the sound of the prototype (power transformer, output transformer, choke, high-temperature/low-ESR electrolytic capacitors) and those used in the original amplifiers (precision Vishay/Dale RN65 metal film resistors, Carbon Film resistors with a capacity of 1 W, SBE 6PS capacitors, high-quality ceramic disc capacitors, Belton lamp panels and Alpha potentiometers). We prefer high-quality closed Cliff connectors (made in the UK) instead of the open-type Switchcraft used in the original and many clones. Also, we sometimes use NOS components from our spare parts collection in places they work well and complement the sound or improve the characteristics of the amplifier.

  • Power 50W
  • Number of channels 2 – CLEAN and OVERDRIVE
  • Lo and Hi inputs
  • The general BRIGHT switch is combined with VOLUME adjustment (Push-Pull)
  • MID BOOST, DEEP and ROCK/JAZZ switches on the front panel
  • Passive equalizer TREBLE, MIDDLE, BASS is common for both channels
  • Tone tuning (Treble, Mid, Bass) of the OVERDRIVE channel inside the chassis
  • The OVERDRIVE channel has its own gain control (DRIVE) and volume control (LEVEL)
  • The BRIGHT switch of the OVERDRIVE channel is combined with the adjustment of the LEVEL (Push-Pull)
  • MASTER and PRESENCE control the power amplifier.
  • 2-button Footswitch with indication, controls channel switching (CHANNEL) and Preamp Boost (PAB)
  • OD TRIM on the back panel (fine-tuning the overdrive channel response)
  • Passive effects loop
  • Lamps 2 x 6L6 - in power amplifier
  • 3 x 12AX7/ECC83 – preamp and phase inverter
  • Supply voltage (Power Requirements) 230VAC
  • Dimensions of the HEAD - 530 x 267 x 262 mm / 20kg
  • COMBO – 530x570x262 mm/24kg (without speaker)

  • Chapman HRM is available in two power options each in the head or Combo format:
  • Head 50W - € 2 500,00
  • Combo 1x12" 50W (EVM 12L Classic - 8 Ohm) - € 3 368,00
  • Head 100W - € 2 660,00
  • Combo 1x12" (100W EVM 12L Classic - 8 Ohm) - € 3 528,00
  • The recommended speaker is Electro-Voice EVM12.
HRM Special by Chepman Audio
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Транзисторный настольный микрофонный предусилитель Chepman 1073B
The effects loop is passive, as in the original. In fact, this is a gap-a tie-in between a preamp and a power amplifier. To fully work with the effects unit, it is recommended to use a special TUBULATOR device, which is a tube interface device with adjustable sending and returning.
Legend HRM is likely to be the preferred option for a musician who is looking for a hotter amp, nevertheless having its own unique rich and complex voice and a large selection of tones. We hope that you will appreciate our modifications, the choice of components and assembly methods. Most of all, we hope that Legend HCX will become an integral part of your sound path and will match your game and music.
Structurally, HRM, like all other amplifiers of the Legend series, is mounted on Eyelet Boards, without the use of printed circuit boards. All connections are made manually with high-quality Vintage Cloth wires.
VOLUME regulates the level of the signal coming out of the tonstack and entering the second lamp stage. Besides the fact that VOLUME controls the volume of the clear channel, note that this also affects the overdrive mode.
BRIGHT is a high—frequency amplification that can be used to add shine to your sound in both Clean and Overdrive modes. BRIGHT is located on the VOLUME controller in a push-pull version. The high-frequency rise is more noticeable when the volume is reduced.
DEEP — amplification of low frequencies. You can use this to add a rich bottom to both pure sound and overdrive. In overdrive, you will feel that the amplifier will become more elastic, and a kick will be added to the response.
MID BOOST — mid-frequency gain. You can add fat to your pure tone or overdrive. Or make the sound of single coil sensors more full. We especially like MID BOOST with overdrive mode.
ROCK/JAZZ adjusts the overall frequency response and sound of the amplifier. ROCK has a denser lower middle and a deeper bottom. The ROCK position is the usual, known to every guitarist, tonal response of a tube guitar amplifier. JAZZ reduces the low and corrects the midrange frequencies, gives the amplifier a more hi-fi response. Try both, as each has a great sound.
PREAMP BOOST (PAB) in HRM amplifies the midrange and weakens the low frequencies, making it ideal for cutting through the mix during solo. You will also notice a slight increase in the level of gain.

Demo recording of Chapman HRM Special sound
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