A complete range of custom shop bass amplifiers
combining classic tube and solid state tone
with Ashdown innovations.

CTM-300 Head

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  • CTM-300 Head

CTM-300 Head

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300 Watt All Tube Bass Amp Head - Handbuilt in UK Custom Shop

Taking inspiration from the classic tube heads of the past, Ashdown presents the all-tube CTM-300, a 300W valve masterpiece that melds classic tones with modern features, construction and reliability.

Built tough for life on the road
Handbuilt in the UK Ashdown Custom Shop the CTM 300 head is housed within an 18mm Marine grade birch ply cabinet that features heavy duty flip style handles and an internal fan to keep things cool. This is an amplifier that is built to last using only the finest components to ensure years of trouble-free performance night after night.

  • Customer Reviews

    Based on 2 reviews Write a review
Amp Review of CTM300 & CTM15
Mark Gooday (founder of Ashdown) and Marc (from Chicago Music Exchange) slap some bass and give one hell of an in-depth review on Ashdown's newest additions to their Valve amp series. Enjoy
CTM 300 Features
Ashdown | Setting the standard since '97
Classic all-valve tone
With a classic five valve preamp configuration and a fully-loaded power section consisting of 6 x KT88 output tubes to provide the huge grunt, warmth and headroom bassists crave, this is a serious bass amplifier to be called into action when only the best will do.
Flexible tone shaping
From mellow '60s bass tone to growling '70s-style bass, straight through to thick and powerful modern tone, the CTM-300 covers a huge range of sonic ground. Hit the Mellow button to engage smooth, warm, clean tones – or punch it out to dial-in pure valve overdriven growl.

Standard tone controls give you a wide range of uber-musical sounds, while Deep, Mid Shift, and Bright switches let you fine-tune your tone to the situation. The EQ section is a passive tone circuit - meaning if all controls are at zero there will be no sound through the amp. All the controls are highly interactive, giving you the possibility to dial in exactly what tone you want. Don’t be scared to dial the pots all the way to get the most from the controls.
Tube life preserver
Saving costly and time consuming trips to the Tech and keeping your amp sounding better for longer, the CTM-300 features user adjustable bias for each individual power tube which can be set by engaging the bias mode of the dual function VU meter on the front panel. Each output tube is individually fused and user replaceable without removing the unit from its case (meter also indicates tube or fuse failure).
Tube-driven DI & Effects Loop
To get your tone direct to the desk in the studio or on stage, the CTM-300 features a tube-driven, transformer-derived DI output with an isolated ground to deliver maximum sonic purity and consistent output night after night.

Similarly, the front-mounted effects loop is also tube-driven for maximum tonal preservation.


Power Output 300 Watts
Power Handling 750 Watts
Power Requirement 115-240 Volts
Speaker Outputs Speakon/Jack
Frequency Response 35Hz - 18Khz
High Instrument Input 450MV
Low Instrument Input 150MV
DI Output Valve Driven Transformer Derived
Output Impedance 2 Ohm Minimum
EQ Passive EQ Section. Bass, Middle and Trebble plus shape push buttons
Effects Send Jack
Effects Return Jack
Pre-Amp Tubes 1 x ECC83 1 x ECC832 1 x ECC99 2 x ECC82
Output Tubes 6 x KT88
H x W x D (mm) 245 x 595 x 335
Weight (kg) 33


CTM 300 User Manual

5 Year Warranty

We're so confident in our amplifiers, we offer a 5 year warranty on all new products.

Built for the road

Perfect for gigging bass players, our products are built to last.