Ceriatone's Custom, hand-built Overtone Special series amplifiers pay tribute to some of the great Dumble boutique guitar amplifiers of the past 40 years, such as the Overdrive Special, Steel String Singer, Winterland and others. Many of the great guitarists of the past 40 years used a Dumble to create their exquisite tone and singing sustain. Stevie Ray Vaughan. Carlos Santana. Robben Ford. Larry Carlton. John Mayer. Joe Bonamassa. Lowell George. This OTS "183" is a tribute to the Dumble amp SN #183.  Much more aggressive OD with lesser cleans than the OTS and S&M versions. Brighter than the OTS and S&M, this aggressive amp has more compression also than previous versions. You can literally save thousands of dollars over comparable boutique amplifiers. The tones of many of the truly great guitarists are kept alive at Ceriatone!

Great chord articulation and string definition. Wonderful for blues, rock, country, and jazz. The Ceriatone Overtone Special (OTS) S&M is a hand built, point to point hand wired boutique guitar amplifier that was designed to capture those great Dumble-esque tones and singing sustain. As with the original Overdrive Specials, none of these amps have reverb, but they do have a passive effects loop. You should purchase our C-lator (tube) or Klein-ulator (solid state) effects loop buffer to use your time-based effects (Chorus, Reverb, Delay, Flange, Phasing, etc.) with maximum effect and minimum noise.

Current lead times are listed on the main page at www.guitarampsusa.com.


Power Output   50 Watt        

Feature Overview
Normal and FET input (with corresponding internal gain adjustment)

Bright, Deep, and Rock/Jazz toggle switches
Treble, Middle, Bass equalization (shared between channels)
Overdrive channel with Level and Ratio controls
Master volume and power amplifier Presence controls
Footswitch Included (Channel and Preamp Boost)
Rear panel OD Trim (fine tunes response of overdrive channel)
Passive effects loop
Full/Half Power switch
Impedance 4/8/16 Ohm Selectable
Dual Speaker Outputs
External Bias Adjust

Power : 2 x EL34
Preamp : 3 x 12AX7/ECC83
Rectifier : Solid State

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 "183" 50 Watt Configuration Options:

  • Chassis I - $1,232
    (Fully working chassis. Includes footswitch. Tubes and cabinet not included.)
  • Chassis II - $1,340
    (Fully working chassis w/ tubes. Includes footswitch. Cabinet not included)
  • Amp Head I - $1,508
    (Fully working chassis installed in a head cabinet. Includes footswitch. Tubes not included.)
  • Amp Head II - $1,616
    (Fully working chassis installed in a head cabinet. Includes footswitch.)
  • 112 Combo Amp - $1,761.50
    (Fully working chassis w/ tubes installed in a 1x12 combo cabinet. Includes footswitch. Speaker not included.)
  • Amp Head w/ C-lator Built In - $1,928.50
    (Fully working chassis installed in a head cabinet with a C-lator Tube Driven Effect Loop Buffer built into the cabinet.) Includes footswitch.)

Main photo is for illustrative purposes only and advertised base pricing is for Chassis I without 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 Ceriatone takes no shortcuts or makes any changes to their build standards in the production of their hand-built amps. This is Ceriatone quality.

Pricing shown on www.guitarampsusa.com 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. They do offer 4 types of payments. Any Debit/Credit card with one click pay, PayPal 4-Pay, use your Paypal account, or use PayPal Financing (6/12/24 months) at checkout.

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OTS "183" 50 Watt

  • $1,232.00

Available Options

Tags: ceriatone, ots, 183, dumble, ods, overtone special