Support for Studio JTM Head

The ST20H is a 20W head with 2 x ECC83, 1 x ECC83 (phase splitter) pre amp valves and 2 x 5881 power amp valves.

Quick assists

Documents

Warranty and Repairs

Accessories & spares

Guides

Device layout

Check this article to know more about the device layout of your amplifier.

Read guideDevice layout

Common questions

When replacing the power valves do they need to be biased?

It is normal for the presence pot to be noisy when turned?

PRODUCT DETAILS

OUTPUT WATTAGE

20W with power reduction to 5W

CHANNELS

Single channel with two voices

ELECTRONICS

Effects loop

INPUTS

4 x 1/4" jack inputs

Documents

User manual

Learn

SupportSupport

Basic EQ

SupportSupport

Wider EQ

SupportSupport

Reverb

SupportSupport

Amps technologies

SupportSupport

Heads and Combos

SupportSupport

Modulation

SupportSupport

Delay

BeginnersBeginners

A beginner's guide: Choosing your first guitar amp

BeginnersBeginners

A beginner’s guide: Setting up your guitar amp

BeginnersBeginners

Understanding basic EQ: How to shape your guitar tone

BeginnersBeginners

Key amp maintenance tips for beginners