The OTS HRM MK2, 50 watt amp has the most highly sought after mods apart from the FM #102 amp. There is a bit more gain on both channels. The OD is crunchier and more compressed. And behold, it's one of the few Ceriatone amps that uses EL34's! Now we're talking! Wonderful for blues, rock, country and jazz.

The Ceriatone Overtone Special (OTS) is a hand built, point to point hand wired boutique guitar amplifier that was designed to capture the tones of Carlos Santana, Stevie Ray Vaughan, John Mayer, Larry Carlton, Robben Ford and many other great guitarists.

Note: PPIMV mounted on Front Panel will be either mounted in place of pilot lamp (Marshall styles) or a hole will be drilled (OTS styles).
          PPIMV mounted on Rear Panel will always be in place of a Speaker Output Jack.

OTS HRM MK2 50 Watt Options:

  • Chassis I - $1,163
    (Fully working chassis. Includes footswitch. Tubes and cabinet not included.)
  • Chassis II - $1,271
    (Fully working chassis w/ tubes. Includes footswitch. Cabinet not included)
  • Amp Head I - $1,412
    (Fully working chassis installed in a head cabinet. Includes footswitch. Tubes not included.)
  • Amp Head II - $1,520
    (Fully working chassis installed in a head cabinet. Includes footswitch.)
  • 112 Combo Amp - $1,644.50
    (Fully working chassis w/ tubes installed in a 1x12 combo cabinet. Includes footswitch. Speaker not included.)
  • Amp Head w/ C-lator Built In - $1,820.50
    (Fully working chassis installed in a head cabinet with a C-lator Tube Driven Effect Loop Buffer built into the cabinet.) Includes footswitch.)

Summary of Features:
Power: 50W
Tube: EL34 x 2, 12AX7/ECC83 x 3
Footswitch Included

Special Features:
Passive Effects Loop
External Bias Jacks with Individual Bias Pots (Makes it easy to check and adjust bias using a VOM, without paying a technician $45 to bias your amp. It only takes 2 minutes and the step by step instructions are in the manual.) 
PPIMV Mod is installed on back panel in one of the speaker jack holes.

Main photo is for illustrative purposes only and advertised base pricing is for Chassis I w/o tubes. Photos may include options that are not included if you order the standard version of the amp or don't order all options available. We also may not offer all options available and/or shown in main illustrative photos. Photos are of products assembled by Ceriatone. We no longer sell kits. Black Tolex is standard on all amps unless otherwise stated in product description.

Ceriatone amps are custom made, 100% hand-built, point-to-point hand-wired amplifiers using the highest quality components and custom wound transformers. Each amp is thoroughly tested and burned in before it is shipped to you. Even with long lead times (due to a large number of guitarists ordering Ceriatone amps and the Covid-19 pandemic), Ceriatone will take no shortcuts or change their build standards in the production of their hand-built amps. Lead times listed are approximate.

Current lead times are listed on the main page at and are approximate.

Pricing shown on includes the shipping cost to the USA only. We only ship to the USA, Canada and Mexico. Shipping to Canada, Mexico, Puerto Rico and the US Virgin Islands will have additional shipping. We'll invoice the difference in shipping and it is due at the time the order is placed. Paypal is our payment processor and you do not need a Paypal account to check out.

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OTS HRM MK2 50 Watt

  • $1,163.00

Available Options

Tags: ots, hrm, mk2, overtone special, dumble, ods,