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The Daily Insight

What valves do Marshall amps use?

Author

Abigail Rogers

Updated on April 28, 2026

EL34. Still used in many amps that Marshall produces today, the EL34 is a Marshall favourite, when creating the first Marshall amplifiers these were used in the place of the 6L6. The EL34 is a pentode, and the extra element (suppressor) reduces any losses in the valve.

Similarly, you may ask, what tubes do Marshall amps use?

The power tubes in most Marshall tube amps were EL34s. They drive the output transformer, then the speakers. Large amps had two or four power tubes in PUSH-PULL, which work like a see-saw: when one tube is decreasing in voltage, the other is increasing.

One may also ask, is Marshall Valvestate a tube amp? smitty_p Well-Known Member. Yup, that's what a Valvestate istube preamp and solid state power amp. They are made to get distortion through the preamp tubes.

Likewise, what tubes are in a Marshall DSL40C?

The Marshall DSL40C Tube Set consists of 4 x 12AX7 preamp tubes and 2 x EL34 power tubes in a matched pair.

What tubes are in a Marshall Plexi?

The SV20H comes with three ECC83 tubes and two EL34 tubes. The same tube layout as the Marshall 1959 SLP 100 watt head. Minus two EL34's that is. The SV20H is excellent news as Marshall wasn't making a real 20-watt Plexi before.

Related Question Answers

What happens if you don't bias a tube amp?

If you changed to tubes with a lower resistance without biasing the amp you would quickly burn through those tubes and potentially damage the amp and yourself in the process. This is because the amp is still pushing out current at a higher level than the valves are able to take.

Why do tube amps sound better?

Tubes, like analog recordings, have a more full-bodied sound than transistor gear. There's a "roundness" to tube sound that solid-state gear never equals. Tubes are less forgiving about mismatches, so to get the best out of a tube amp it must be used with just the right speaker.

How do I know if my amp tubes are bad?

Crackling, squeals and feedback, excessive noise and muddiness or low output are all evidence of tube problems. Power tubes. The two main symptoms of a power tube problem are a blown fuse or a tube that begins to glow cherry red. Either are typically indicative of a power tube failure.

How long do amp valves last?

Power valves should be replaced every 18 months to 2 years and all valves should be changed at the same time. The amplifier should then be re-biased. Preamp valves should be replaced every 4 years and can be replaced individually. The amplifier won't require biasing after this.

Are tube amps worth it?

In many cases, tube amps do not require the amount of maintenance that they have a reputation for. As long as you properly take care of your gear, owning a tube amp is simple and very well worth it for the tone.

Does a good amp make a difference?

Yes good amp makes HUGE difference. Long answer: tube amps will most definitely improve your sound versus a solid state amp like your 15G. Now there are some great sounding solid state amps out there but those are rare and nothing beats the full sound of a tube amp.

Do power amps affect tone?

The power amp doesn't make a lot of difference in the tone, but it can make a big difference in the sound.

Do tubes affect tone?

Bowers: There are some solid-state circuits that do an impressive job for tone, but the reason guitarists gravitate to tube amps is the harmonics. The secondary harmonics of a tube are additive to the harmony of the note, where the secondary harmonics of a solid-state amplifier are dissident to the tone.

What are Valvestate amps?

The Valvestate technique was to put a single 12AX7 valve into the pre-amp section of the amplifier while retaining the solid-state technology in the rest of the amp. This in effect created a hybrid, valve-state amplifier that delivered traditional Marshall tone in a more robust format.

What is a hybrid tube amp?

Hybrid Guitar Amps. Hybrid amps are made by several manufacturers with the intent on giving you the best of both worlds. the basic idea is a great tube sound, while providing the signal processing and reliability of a digital amp. Line 6 uses an all solid state preamp and a Bogner designed tube power amp.

Why is a Marshall called a plexi?

The name originates from its shiny, Plexiglas panel, commonly used on Marshall amps between 1965-1969. The 68 specification amps were a hit with Jimi Hendrix, Cream and The Who, creating huge amounts of exposure and marking the 'Plexi sound' as the sound of rock.

What is Marshall Plexi tone?

The 'Plexi' nickname refers to the control faceplates Marshall used on their earliest amplifiers, which were made from clear plastic with black lettering screen-printed onto the back face and over-sprayed with gold paint.

Is a JMP a plexi?

At its heart, and in terms of its aesthetics and power, the JMP 2203 — which eventually became the JCM 800 — is very much in the same spirit as a 100 watt Marshall Plexi with four EL34s in its power section. But the biggest difference is the JMP 2203's master volume and “Pre-Amp” volume controls.

What year did the 100 watt Marshall Super Lead Model 1959 first become available?

1965

When was the Marshall Plexi made?

1959

When did Marshall switch to EL34?

In 1972 EL34 tubes were getting harder to come by, so the American distributor started replacing them with 6550 tubes. In 1973 Marshall switched to printed circuit boards (no more point-to-point hand wiring), marking the end of an era but not the end of classic Marshall tone.

When did Marshall amps come out?

September 1962