The incredible British amplifiers expertly built in the late ‘60s and ‘70s inspired us to create the Ceriatone Hey What series.

The Ceriatone Hey What 504OL is the 50W head that features an added gain stage compared to the standard 504.  Made in an era where another British manufacturer added a gain stage and master volume control, the 504OL saw a different flavor of the famous Hey What tone.

The 504OL maintains the same signature width of sound as the 504, but with much more gain available.  As such, it does not have the clean headroom available in the 504 or 103, but does offer a more singing tone that works in all rock settings.

The sound of a Hey What is different than other amplifiers.  We consider it extremely balanced, and responds SO well to all guitars, pedals, etc.  In particular, the 504OL is home some of the most articulate crunch and lead tones, ever.  All of this wrapped up with a military-spec construction technique, and you have the unsung hero of guitar amplification.

Like other Ceriatone amps, we have labored carefully to select the finest components to suit the design, and the 504OL uses our specially designed custom transformers for superior reliability, frequency response, and feel.

PPIMV available as an option can be installed on Rear Panel only.

Two Channels (Normal & Bright / 4 Inputs (High / Low)
50 watts
EL34 x 2, 12AX7 x 3, 12AT7 x1
Impedance: 4 / 8 /16 Ω
Individual Channel Volume
Extra Gain Stage
3-Band EQ

Hey What?! 504OL Configuration Options:

  • Chassis I - $861
    (Fully working chassis. Tubes not included. No cabinet.)
  • Chassis II - $955.50
    (Fully working chassis. Tubes included. No cabinet.)
  • Amp Head I - $1,096
    (Fully working chassis installed in a head cabinet. Tubes not included.)
  • Amp Head II - $1,190.50
    (Fully working chassis installed in a head cabinet. Tubes included.)

Main photo is for illustrative purposes only and base pricing is for Chassis I. 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. You must order all kits direct from Ceriatone Malaysia.

Ceriatone amps are custom made, 100% hand-built, point to point hand-wired amplifiers. Each amp is thoroughly tested and burned in before it is shipped to you. For this reason, the build lead time is approx. 11-14 weeks for custom hand-built amplifiers and 5-10 days for pedals and buffered effects loops.

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.

Note: We ONLY ship to PayPal verified addresses if paying via PayPal. No exceptions.

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HeyWhat?! 504 OL

  • $861.00

Available Options

Tags: ceriatone, hiwatt, hey what, 504, OL, 504OL