Introduction

Lehnert make swedish handbuilt tubeamps for guitar on order. We offer excellent sounding customer specific products with a high service level to affordable prices.

It is our opinion that a guitar amp is an integral part of the instrument. We build high class amps to suit your taste, playing style and your instrument.

The Lehnert Ramblers: 25 or 50 Watts, head or 1X12" combo, or as a 25W 1x10" Mini Combo with a 10" Celestion Vintage 10 speaker.
Rambler is an one channel amp with three modes: Normal, Bright & Boost.
Tube driven parallel effects loop is standard.

The Lehnert Sunbeams are two-channel amps with switching and independent tone controls, available as 50 Watts head or 1x12" combo. Tube driven parallel effects loop included.

25 Watts? Is that really strong & loud enough? Yes, due to the high efficency of the amp. When the Rambler is not loud enough for your needs, you have to put a microphone in front of every other instrument in the ensemble as well. (The bassdrum, the brassinstruments, the violin and the keyboards already prey on the PA, don't they?)

But if it is so, that you really need some more raw power and headroom, we also offer 50 Watts versions of our models, all tube Class A/B with 2x 5881, EL34's, 6L6's or 6550's in the powerstage.

History

It all began in 1977 when Ola (Lehnert) was working extra as a cable- & troublemaker with the dynamic Eric Antoni (founder of Musikbörsen & nowadays owner of JAM supermarket).
"Nysse" Nyström was another obstinate employee at Musikborsen. He had a Gibson
GA-30 amp that sounded very nice and he let everybody know that.
He still has it, looks awful and presents a fair context to the owner.

The service manager Tommy Wistrand declared: "We can copy that one". Toroid trafos were ordered, Ola redraw the circuit and a bent aluminium sheet was made to house the project "Vimse".

It sounded no good.
Eventually when late one night Ola borrowed the output transformer from Nysse's amp things fell into place.

Unfortunatly, the project was not continued. No search for good output transformers were made and Nysse really wanted his back.

It was not until in 2003 when Ola was home with his first borned the project "Vimse" was taken up again. the bent alu sheet was found but the transformers were gone.
Litterature, components och trafos were ordered. In the middle of the following summer was the prototype of the Rambler amp ready.

In 2004 the first Rambler amp #OlaOla was delivered.

The first series Had a preamp circuit inspired by Kevin O'Connors "Standard Amp".
In 2007 the EVO Preamp was launched and got a revision in Sept. 2007.
It has three modes: Normal, Bright & Boost. The tone controls have two voices: flat & mid-dip.
As an option there is an extra "Fluid-Drive switch available.
The EVO also has tube driven effects loop as standard.

Tech

Rambler 25 Watt "Class A" (21 W RMS @ 8 Ohm) all tube head or
combo with a 1x 12" Celestion speaker.
Tubechart: 3 pcs. 12AX7, 2pcs. 6V6GT.
You can also use EL34 power tubes without any modifications.

Rambler/Sunbeam 50 Watt "Class AB" (50 W RMS @ 8 Ohm) all tube head or ´
combo with 1x 12" Celestion speaker.
Tubechart: 3 pcs. 12AX7, 2pcs. 5881.
You can also use EL34, 6L6GC or 6550 as power tubes after proper bias adjustment
which easily is done with a DMM from the outside of the chassis.

The Rambler/Sunbeam amps are point-to-point hand & hard wired (no printed circuits)
yet so far.

The cabinets are made of plugged and glued pine with baffles in birch ply.
The combo cabinet comes as open back.

A 12" Celestion Century (80W) speaker is standard equipment in the combo models.
Other speaker alternatives may be offered on special request.

What is Power Scaling?

Power Scaling is a proprietary technology London Power by Kevin O'Connor developed to allow the maximum power of an amplifier to be dialed down to whatever level you need.

It is not just like a speaker load box. "Speaker load boxes", "speaker emulators," and "speaker attenuators" are all forms of attenuation that are interposed between the output of a power amp and the speaker. They work for some people but are notorious for sounding "buzzy" at high attenuations.

The key to Power Scaling is that it is applied to the power output tube stage itself,
and so comes before the output transformer.

A 'master volume' will do the same thing only in specific situations. If you only play clean or you only use preamp overdrive or distortion tones, then a 'master volume' will satisfy you. Power Scaling is the best solution for those players who incorporate some amount of output stage "effect" in their sound. This effect can be some clipping, heavy clipping, or just that cusp of compression you get in a tube power amp approaching clipping. Power Scaling allows you to live at that cusp or beyond, but at ANY loudness you need.