Ceriatone OTS HRM 50


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The Ceriatone Overtone Special HRM 50 is another unique Ceriatone perspective on classic American high-gain tone.

The Overtone Special HRM is a Ceriatone-massaged version of a certain “D” circuit iteration.  These amps are commonly referred to as “HRM”, which is a tip of the hat to hot-rodded British guitar tones.  The sound is generally more aggressive than their non-HRM counterparts, especially when the Preamp Boost is engaged.

HRM amps have an internal adjustable tonestack (treble, middle, bass) for the overdrive channel.  This allows the player to fine tune gain tone to their liking.  Also unique to the HRM amplifier, each channel has it’s own independent Master Volume control.

Like other OTS amps, we have labored carefully to select the finest components to suit the design.  As with all Ceriatone amplifiers, it uses our specially designed, custom transformers for superior reliability, frequency response, and feel.

  • Hi and Lo Inputs
  • Push-pull Bright switch on Gain control
  • Mid-boost, Deep, and Rock/Jazz toggle switches
  • Treble, Middle, Bass equalization (shared between channels)
  • Overdrive channel with Drive and Level controls
  • Internal Treble, Middle, Bass tonestack trimmers (overdrive channel)
  • Push-pull Bright switch on Overdrive Level control
  • Separate Volume controls for each channel
  • Footswitch (Channel and Preamp Boost)
  • Rear panel OD Trim (fine tunes response of overdrive channel)
  • Passive effects loop
  • Full/Half Power switch
  • Power : 2 x 6L6GC
  • Preamp : 3 x 12AX7/ECC83
  • Rectifier : Solid State