Blackstar HT Studio 20H 20-Watt Tube Guitar Amplifier Head

Versatile 20-watt all-tube guitar head with EL34 power tubes, two channels, ISF tone shaping, digital reverb, and effects loop

The Blackstar HT Studio 20H is a compact 20-watt tube guitar amplifier head designed for home studios, rehearsals, recording, and smaller live setups. Its two-channel design covers clean tones through classic crunch and higher-gain overdrive, while Blackstar’s ISF control lets the overall EQ character shift between more American- and British-style responses.

The amp uses two ECC83 preamp tubes and two EL34 power tubes, with built-in digital reverb, master volume, effects loop, speaker-emulated output, and multiple speaker impedance options.

Condition:

Very good physical condition and excellent working condition. Fully tested with no functional issues. There are some minor scuffs, small tears/chips in the exterior covering, and normal cosmetic wear around the corners and edges, but nothing significant.

All front controls, switches, input, rear connections, and power operation function properly.

Includes:

• Blackstar HT Studio 20H amplifier head
• AC power cable
• Not included: Footswitch, speaker cabinet, instrument cable, original box, manual, or other accessories

Key Features:

• 20-watt all-tube amplifier head suitable for studio, rehearsal, and live use
• 2 × ECC83 preamp tubes and 2 × EL34 power tubes
• Two channels: Clean and Overdrive
• Blackstar ISF control for adjustable American-to-British-style tone shaping
• Independent Clean volume/tone and Overdrive gain/volume controls
• Three-band EQ with Bass, Middle, and Treble
• Built-in digital reverb
• Master volume control
• Effects loop for pedals and external processors
• Speaker-emulated output for recording or direct connection

Technical Specifications:

• Model: Blackstar HT Studio 20H
• Series: HT Venue
• Type: Tube guitar amplifier head
• Output power: 20 watts RMS
• Preamp tubes: 2 × ECC83 / 12AX7
• Power tubes: 2 × EL34
• Channels: 2 – Clean and Overdrive
• Speaker outputs: 1 × 16Ω or 1 × 8Ω / 2 × 16Ω
• Connections: Footswitch, effects send/return, emulated output, speaker outputs
• Finish: Black with gold trim

Frequently Asked Questions:

Q: What styles of music is the HT Studio 20H suited for?
A: Its clean and overdrive channels cover a wide range from clean and blues tones through classic rock, hard rock, and higher-gain sounds.

Q: Does this amp require a separate speaker cabinet?
A: Yes. This is an amplifier head only and must be connected to a suitable speaker cabinet with the correct impedance before normal amplifier use.

Q: What does the ISF control do?
A: Blackstar’s ISF control changes the character of the EQ, allowing the tone to move between more American-style and British-style voicings.

Q: Can it be used for recording?
A: Yes. It has a speaker-emulated output designed for direct recording and other line-level applications.

Q: Can effects pedals be connected through an effects loop?
A: Yes. The rear panel has dedicated effects send and return connections with selectable +4 dBV / -10 dBV operating level.