Fender Pro Junior IV Combo Valve Amplifier - The Harmonica Company
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Fender Pro Junior IV Combo Valve Amplifier


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  • 15 watts
  • Jensen 10″ P10R speaker
  • Volume circuit modified for more gradual breakup
  • Tighter bass response when overdriven
  • Lacquered tweed covering; vintage-style ’50s grille cloth; leather handle
  • Chrome control panel with vintage-style red jewel light


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Fender Pro Junior IV Combo Valve Amplifier

Fender Pro Junior IV Combo Valve Amplifier – Long-revered by players of all stripes, the 15-watt Pro Junior IV adds a modified volume circuit and a classic tweed appearance to this workhorse amplifier. A compact and straightforward tone machine, this amp is ideal for harmonica players who need great tone and remarkably touch-sensitive dynamic response.

Modifying the volume circuit allows for more gradual and linear breakup as volume increases, making it easier to precisely dial-in tones that range from sparkling and pristine to gritty and mean.

We’ve revoiced the Pro Junior IV’s overdrive circuit, tightening the bass response while improving the clarity and definition for tone that snarls with attitude when pushed.

Jensen speakers are the traditional Fender amp speakers, featuring sweet articulation with cool vintage-style breakup when pushed.

The exclusive lacquer tweed covering has a fresh-from-the-factory look straight from the late ’50s and a vibe that’s cool on any stage.

In addition to the handsome covering, this amp features the silvery style of a mirrored chrome control panel capped with a Fender hallmark: a vintage-style jewel light.

As a special touch, this amp’s handle is carefully crafted from leather. Not only is the handle durable and stylish, the all-leather construction is an authentic detail from our past.


  • Voltage
  • Wattage
    15 Watts
  • Controls
    Volume, Tone
  • Channels
  • Inputs
    One – 1/4″


  • Cabinet Material
    3/4″ Particle Board
  • Amplifier Covering
    Lacquered Tweed
  • Grille Cloth
    50s Style
  • Amplifier Jewel
    Red LED
  • Front Panel
  • Handle
    Vintage Leather Strap


  • Speakers
    One – 10″ Jensen® P10R
  • Total Impedance
    8 ohms


  • Preamp Tubes
    2 x 12AX7
  • Power Tubes
    2 x EL84
  • Rectifier
    Solid State


  • Amp Height
    14.5″ (36.83 cm)
  • Amp Depth
    8.75″ (22.22 cm)
  • Amp Width
    15.25″ (38.73 cm)
  • Amp Weight
    22.85 lbs (10.36 kg)

Additional information

Weight 11 kg


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The Harmonica Company is the trading name of The Harmonica World Ltd. Registered Company 10370912. VAT Number: GB287764345.