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

Learn the basics

Follow these steps to set up and start using your Studio JTM Head

Device layout

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

Read guide

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

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

OUTPUT WATTAGE

20W with power reduction to 5W

CHANNELS

Single channel with two voices

ELECTRONICS

Effects loop

INPUTS

4 x 1/4" jack inputs

User manual

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Basic EQ

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Wider EQ

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Reverb

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Amps technologies

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Heads and Combos

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Modulation

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Delay