Midnight Special 300B Head


The Midnight Special Head is the enhanced head version of the tried-and-true Midnight Special Combo introduced in 2000 and the best known Siegmund amplifier.

This is the 300B version with an original circuit design that creates a huge sound stage and super wide frequency response
with round warm lows, talking mids and sweet sparkling harmonics in perfect musical balance without any restrictions or limitations.

Plus an added Volume bright switch, Reverb Intensity, Voice Control and Master Volume and 'Live Amp Sound' Line Out.

Handwired point to point terminal wiring

Octal preamp tubes

Versatile, interactive tone controls

Transformerless Reverb

True bypass Master Volume

External class AB bias & balance adjust

Unique no-compromise Custom Transformers
by Mercury Magnetics

Highest quality NOS components

Class A single-ended, 10 Watts
Self-biasing output stage
300B power tube
83 Mercury Vapor Tube Rectifier
Octal base preamp tubes 6SL7,6SN7
LAS Line Out ™ with Level Control
and XLR and TRS outputs
Series FX loop
Reverb On/Off jack
Transformless tube reverb
Sprague Vitamin Q paper/oil tone capacitors
Carbon composition resistors
Sprague ATOM TVA filters
Point to point terminal cloth wiring
NOS tube sockets
Powder coated Aluminum chassis 12 ga.

100,120,220,240VAC 50/60Hz
Handmade in USA

Available as Head cabinet, Chassis only or 1x12 combo

Octal preamp tubes have a wider tonal spectrum and sound more relaxed and revealing with less compression than later 9 pin versions.
In combination with the harmonic richness of the custom wound extended range output transformer by Mercury Magnetics
the Midnight Special reveals the pure power & beauty of the vibrating string.

The Midnight Special is entirely hand-built, using the best-sounding NOS caps and resistors.
Terminal point-point wiring is the same technique used by the military and in aviation construction for reliability.

The 300B is single-ended class A self-biasing and considered by audiophiles as the 'Holy Grail' of output tubes since it was introduced in 1934.
This tube has a unique sound quality unlike any other and has become legendary for it's big soundstage, warm round lows, detailed mids and sparkling highs in perfect musical harmony and balance.

Raising the quality level even higher, the Midnight Special has a transformerless Reverb design, providing extra rich harmonics and reflections.
The stacked control knob provides Mix and Intensity settings from Zero Reverb over subtle swells all the way to huge endless Reverb only.

The tone controls are highly interactive and the Voice control shifts the entire EQ from rich, fat, warm to bright, thin and edgy tonal ranges.
The Master Volume is true-bypass when turned all the way up.

The output transformer has musical even-order harmonic break-up.
The LAS -Live Amp Sound- Line Out ™ comes with Level control and XLR and TRS outputs. When the speaker cable is unplugged an internal load takes over.

And as always, all Siegmund amps are completely hum-free without compromising tone and liveliness.

Laser Engraved Front Panel (Illuminated option available)

Panel Controls:

Front: Input, Volume/Bright, Reverb/Mix, Voice, Treble, Middle, Bass, Master/EQ Bypass, Standby Switch, Power Switch

Rear: Reverb Input and Output and On/Off switch, LAS Line Out ™ and Level control, XLR and TRS outputs, Series FX Loop


Standard: 2 x 6SL7, 6SN7, 300B, 82

Vintage NOS and new production tubes. Ask for Premium Tube Upgrades for the ultimate tone experience!
Ceramic sockets with gold pins are available as a custom option.

Speaker outputs are available in 8 or 16 ohm only or 8/16 ohm switchable.

Covered cabinets are individually custom made to order from solid pine and your choice of color, grill type and handle.
Ask for samples of available covering and grill cloth.

Solid wood cabinets are individually custom made to order from hand selected solid wood with oil finish.

Covered tolex cabinet

with Silver hammered finish

User Feedback:

Hey Chris,

I had a couple hours to really run the amp this morning. The cleans are beautiful and it breaks up a bit earlier than I expected. I got some nice dynamics going according to how hard I was playing. It definitely will let you know how good your pickups are and the output. It behaves differently than the regular MS for sure, or other amps I own.

My low output pickups on my strat sound great but the volume was on the low side. When I ran it with P90s I felt like it really came to life. I felt like I could get a lot more dynamics going on and volume. I also thought the distorted tones sounded better at higher volumes but I still need more time to figure it out. Bypassing the EQ also gives a huge boost in volume that surprised me.

I found it also an unforgiving amp with playing style. Any little mistake in your technique comes right through. I really had to focus on playing almost perfectly to get the sound just right. Once I did I was richly rewarded with a balanced tone and ALL the strings coming through. There wasn't a dead spot to be found. This amp is definitely for the accomplished player. A very pro-level piece of gear. I think right now the amp is above me and I am going to have to do some serious practice to get better and bring my playing level up to the level of the amp!

The reverb sounds great, as usual. The tubes look awesome hanging in there. I just love the look of the massive 300b. Also, thanks for the awesome preamp tubes! I had a close look at all that NOS glass you installed. Thanks!!! There are also some nice touches on the cab. The way those metal inserts for the back panel work are a stroke of genius. This should become an industry standard. It was amazingly easy to take out and reinstall that back panel. What a thoughtful idea.


I tried out that Gold Lion 300B in the MS today. It was an interesting experiment.
I felt like there was a pronounced mid range punch with the Gold Lion tube and I could also get a more vocal quality with the lower bass notes. I found the D,G,B strings really came through quite strongly and the lower E and A had a nice clear, vocal quality bass punch. It was quite nice. I found myself having to dial out less bass with that tube. It was a beautiful tone. Almost had a Hendrix-like quality with his clean work.

You really have to be in tune and more importantly, play in tune. Technique seems to be a huge factor with the amp. I am still learning how to play all my notes in tune while playing a song and it is proving to be very important. If I miss a note, it really comes through.

The mesh plate didn't have quite the mid range punch and seemed to be more balanced across the tonal spectrum. I also think I need to get used to that Tone Tubby Speaker. I am used to playing a Celestion G12 H30 or the Blue in the MS and they have a different quality.

That's my take. I liked them both but I think you made the right choice for balance with the mesh plate tube. I think if I ever have a gig in a big mix, with two guitarists I may swap it out for the other tube for some punch to cut through.

Thanks again!
Tim Smith

Hi Chris-

I LOVE my MS 300B.
Taken a while to get to know it and during that process, eliminated most of the pedals I normally use. I started off using the Missing Link in line with a Bad Cat 2-Tone into the 300. Then I dropped the Bad Cat and eventually the Missing Link too.
During this time I had my Santa Cruz F neck reset and with the return of that guitar - my relationship with that instrument has rekindled - thanks to your amp. The rig has also been enjoyed with my 1979 Yamaha electric SA-2000S. The versatility is amazing.
I continue to be amazed by the variety of sounds from this amp.
[must admit to anxiety in our dialogue over the purchase as it grew from a reverb box... to the MS-300... to the addition of the ML. However, you know your stuff - and the amp delivers EVERYTHING you said it would.]

I really am a fan of your quality, craftsmanship and attention to detail.
Hoping to further my gear collection with more of your innovations.

Kind Regards

I had some time to spend with the amp over the weekend, happy to say it's going to take a while to learn all the intricacies and spaces it can create.
There were moments of pure transcendence indeed!
It feels more like a high end instrument than something that solely reproduces sound, with its own voice and distinctive characteristics.
It has continuity with the great heritage and ancestry of tube amplification yet is its own unique instrument at the same time.
Other amplifiers seem to originate sound from a single point and project it as such, the MS300 you have built for me fills the space with such beautifully textured, almost tangible sound.
I keep thinking of that sunset I saw after first playing it and am reminded of what photographers refer to as the 'golden hour', that hour in the early morning and again in the late afternoon where the light soaks and illuminates everything in the most wonderful and illustrious manner.
The MS300 is like having that 'golden hour' on tap.

Many, many thanks!


Sound Samples:

Here are a couple sound samples with a Tone Tubby Purple Haze and smaller 17 oz Alnico magnet.
The guitar is the
I upgraded a large diaphragm condenser tube mic with a Micro Tube, Neumann U47 replacement capsule and Jensen transformer plugged into the Simplex Mic Pre

Clip 1

Clip 2

LAS -Live Amp Sound- Line Out is a trademark of Siegmund Guitars & Amplifiers