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Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo

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Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo

$733.00 to $749.00 Price Tier: Standard

2 Critic Reviews

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Page last updated Jul 06, 2026

Pricing and availability

We compare 600+ stores and found this item at 3 stores. Prices updated June 30, 2026.

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Price

4.0 (3)

$749.00

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4.0 (2)

$733.00 11 available New

$500.00 1 available Used

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$749.00

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Average Price: $683

Standard/Professional

$300

$701+

Price Tier

In the Combo Guitar Amplifiers category, Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo is priced in the upper end of the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Price History

Based on price data from 2 merchants for "Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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Unlock the perfect blend of vintage warmth and modern versatility with the Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo. Designed for the discerning musician who craves both classic and contemporary tones, this amp is your ticket to an expansive sonic journey. Whether you're performing in cozy venues or crafting tracks in your home studio, the H620 stands out with its dynamic tube-driven sound.

Harnessing the power of two 6L6 power tubes and three 12AX7 preamp tubes, this amplifier delivers 20 watts of pure tonal bliss. The Italian-made 12" Jensen Falcon speaker effortlessly projects warm lows, rich mids, and sparkling highs, making it perfect for rock, blues, jazz, and everything in between. With a 3-band EQ and a Presence knob, you’ll enjoy precise control over your sound palette.

For those who appreciate flexibility, the built-in power attenuator ensures you achieve the full tonal spectrum even at lower volumes, making late-night jam sessions possible without compromising on sound quality. The foot-switchable Tremolo, Reverb, and Gain Boost add layers of texture to your music, while the line-out jack provides seamless direct recording options for capturing those inspired moments.

Key Features:

20 watts of tube-driven power
Two 6L6 power tubes and three 12AX7 preamp tubes
Italian-made 12" Jensen Falcon speaker
3-band EQ and Presence knob for tone shaping
Built-in power attenuator for volume control
Foot-switchable Tremolo, Reverb, and Gain Boost
Line-out jack for direct recording

Product specs

Brand	Harmony
Model	Series 6 Model H620 20-Watt 1x12" Guitar Combo
Year	2021 - 2025
Made In	China
Categories	Guitar Combo Amps
Built-In Effects	Built-In Effects
Electronics	Tube
Number of Channels	1 Channel
Number of Inputs	1 Input
Output Power (Watts)	20
Power Tube Type	6L6
Reverb	Spring Reverb
Speaker Configuration	1x12"

FAQs

What kind of tones can I expect from the Harmony H620 Tube Combo Amplifier?: The Harmony H620 delivers classic tube-driven tones with a warm and rich sound, thanks to its 6L6 power tubes and 1x12" speaker configuration. It's versatile enough for clean tones and moderate overdrive, making it suitable for blues, rock, and jazz genres.
Is the Harmony H620 suitable for gigging with a drummer?: With its 20-watt output, the Harmony H620 is powerful enough for small to medium-sized venues and can keep up with a drummer, especially when mic'd up for larger gigs.
Does the Harmony H620 take pedals well?: Yes, the Harmony H620 is designed to work well with various guitar effects pedals, enhancing your tonal palette while maintaining clarity and responsiveness.
What built-in effects does the Harmony H620 offer?: The Harmony H620 features built-in spring reverb, providing a classic and lush reverb effect that complements its tube-driven sound.
How portable is the Harmony H620 Tube Combo Amplifier?: The Harmony H620 is relatively portable for a tube combo amp, with a compact 1x12" design that makes it easy to transport to rehearsals and gigs.

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Harmony Series 6 Model H620 20-Watt 1x12" Guitar Combo.

Features and functionality

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The Harmony H620 includes a boost switch, which significantly increases volume but is not adjustable, useful primarily for preamp distortion.
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The H620 offers a silent setting and line out, allowing connection to another amp or DAW for versatile recording and performance options.
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The Harmony H620 includes a three-button footswitch for controlling tremolo, reverb, and FX loop, which some find more versatile than the Blues Jr.'s single footswitch.
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The Harmony amp's tube chassis requires removal to swap tubes, but its through-hole PCB components and chassis-mounted pots and tube sockets are praised for serviceability.
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User experience

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Owners report the amp's 0.1w setting can achieve bedroom volume levels suitable for late-night practice without disturbing others.
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The amp’s tremolo effect is praised, but opinions on the reverb vary, with some users preferring an external pedal for psychedelic tones.
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Users find the Harmony's amp tremolo effect sweet and addictive, with many incorporating it into their regular playing after owning the amp.
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Owners with extensive amp collections report that the Harmony sees more use due to its natural tube breakup and effective attenuation settings for home use.
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Value and pricing

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Despite being back-ordered, some users found buying used through stores like Guitar Center a viable option.
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Comparisons

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The Harmony H620 is described as having a Fender-like clean tone with added Vox chime and British crunch when pushed, offering more grit and dimension than a Fender Blues Jr.
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Harmony H620's sound is noted as less shrill compared to the Blues Jr., even with its stock setup, while the Blues Jr. often requires speaker upgrades to mitigate shrillness.
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Build quality

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The Harmony's construction features plywood, which users note as more robust compared to the MDF used in the Blues Jr.
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The Harmony H620 is noted for its boutique aesthetic, though its white grill cloth may show wear more visibly with frequent gigging.
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Use cases and applications

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The Harmony H620 is favored for home play due to its attenuation settings, whereas the Blues Jr. has more clean headroom at gig volumes.
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Critic Reviews

The Big Review: Harmony Series 6 H605, H620 & H650 amplifiers

guitar.com

The Harmony Series 6 Model H620 delivers a charismatic blend of retro aesthetics and modern features, making it a solid choice for guitarists seeking vintage charm without breaking the bank. With its striking dark blue vinyl and gold piping, the amp is as much a looker as it is a performer. It offers impressive versatility with real spring reverb, effects loops, and onboard tremolo. However, its core tone can veer towards honkiness, largely attributed to the Jensen Falcon 50 speaker. While not boutique, its build quality and host of features make it compelling. The H620 shines in overdriven settings but lacks a bit in clean headroom. Despite these quirks, the amp's tonal flexibility and engaging character make it a thrilling companion for rock enthusiasts craving that classic American roar.

positive

Full Review

Harmony Series 6 H620 Amplifier Review

russomusic.com

The Harmony Series 6 H620 impresses with its blend of American and British tube tones, offering expressive cleans and breakups thanks to its gain and boost controls. The onboard attenuator and zero-watt line-out feature make it versatile for bedroom players and home studios alike. Its vintage design and robust construction provide a nostalgic charm, while the deep interactivity between volume, presence, and gain controls allows for a wide range of tonal crafting. However, those seeking distinct channel separation might find its single-input design limiting. Overall, the H620 is a versatile and expressive all-in-one tube amp that caters well to players looking for classic sounds with modern flexibility.

positive

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