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HDR Juicer 50;: image 1 of 5
HDR Juicer 50;: image 2 of 5 HDR Juicer 50;: image 3 of 5
HDR Juicer 50;: image 4 of 5 HDR Juicer 50;: image 5 of 5
Juicer 50

The colour of the tolex is pretty self-explanatory in this case, whereas the name "Juicer" probably needs some explanation: it is meant to say that "there is a lot of juicy pulp inside"... And maybe also something about how the machine can cope with various species of citrus fruits ;-)

FEATURES:

Channel 1:
A very bright "British" clean tone with shimmering upper harmonics.

Channel 2:
The Juicer's distorted channel is extremely versatile. Its gain knob has an exquisite usable range - from a raw, tight crunch to a hairy hi-gain lead.

Bass, Middle and Treble independent on both channels

All-tube Series Effects Loop

Master A/B- two footswichable output volume levels

Spring Reverb - tube-driven, vintage style circuit

Presence, Depth

The half power mode lowers power tubes' anode voltage to reduce their total power to about a half and to enable earlier power amp compression. However, unlike most similar constructions, this one is a little bit more sophisticated: it compensates the preamp supply voltage drop and power tubes' bias, so that the overall voicing and gain structure does not change dramatically.

SPECIFICATIONS:

Preamp: 3x ECC83 (12AX7), 1x ECC81 (12AT7)

Reverb: 1x ECC81 (12AT7)

Poweramp: 1x ECC83 (12AX7) , 2x EL34 / 50W

Dimensions (W/H/D): 660 x 260 x 260 mm

 

 

HDR Prince;: image 1 of 3
HDR Prince;: image 2 of 3 HDR Prince;: image 3 of 3
Prince head

Another variation on a classic princeton-ish theme, enriched with various interesting features.

Beside its portability, one the most important criteria was the ability to be used as a poweramp. Therefore a tone-cut was added to tweak the treble response in case that the signal skips the preamp's equalizer.

FEATURES:

High and Low inputs

Volume, Bass, Middle and Treble

Preamp output

Poweramp input

Master Volume

Tone Cut

SPECIFICATIONS:

Preamp: 2x ECC83 (12AX7)

Poweramp: 2x 6V6 / 15W, 1x 5AR4 (rectifier); swichable tube or solid-state rectification

Dimensions (W/H/D): 430 x 200 x 200 mm

 

HDR Ochepovsky;: image 1 of 3
HDR Ochepovsky;: image 2 of 3 HDR Ochepovsky;: image 3 of 3
Ochepovsky combo

A perfectly purist combo built for Igor Ochepovsky, an outstanding jazz guitarist and composer.

Its preamp is based on an archetypal princeton circuitry, however we used a more powerful poweramp and a speaker with a great power handling capability, so that the bass is tight at virtually any volume.

The combo is built of solid pine hence it could hardly be more vintage.

FEATURES:

High and Low inputs

Volume, Bass, Middle and Treble

Poweramp input

Master Volume

Slave out, frequency compensated, direct recording capable

SPECIFICATIONS:

Preamp: 2x ECC83 (12AX7)

Poweramp: 2x 6V6 / 20W, 1x 5AR4 (rectifier)

Speaker: Jensen C12K

Dimensions (W/H/D): 620 x 440 x 240 mm

 

HDR Custom Auron;: image 1 of 4
HDR Custom Auron;: image 2 of 4 HDR Custom Auron;: image 3 of 4
HDR Custom Auron;: image 4 of 4
Custom Flagship

This two-channel head is derived directly from its bigger three-channel brother. The first channel is completely identical. On the second one we added a little gain because of better versatility without the third hi-gain channel.
On the last photograph, you can see a comparison of the compact two-channel and the classic three-channel version

SPECIFICATIONS:

Preamp: 4x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2xEL34 / 50W

Dimensions (W/H/D): 620 x 240 x 260 mm

 

HDR HDR Custom Flagship;: image 1 of 6
HDR HDR Custom Flagship;: image 2 of 6 HDR HDR Custom Flagship;: image 3 of 6
HDR HDR Custom Flagship;: image 4 of 6 HDR HDR Custom Flagship;: image 5 of 6
Customized Flagship

The ultimate 4-channel Flagship in a custom vintage design. It is basically the same amp in terms of sound and features, with the exception of an additional MIDI control.

SPECIFICATIONS:

Preamp: 5x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2xEL34 / 50W + 2x KT88 / 95W (or 2x 6L6GC / 60W)

Dimensions (W/H/D): 680 x 260 x 260 mm

HDR HDR Custom Flagship;: image 6 of 6

Compact 2x12 cabinet

A compact 2x12 reprobox fits under the 680mm head perfectly.
The combination of speakers is mainly suitable for metal players who prefer an agressive, mid-scooped sound.

SPECIFICATIONS:

Construction: 2x12 enclosed horizontal cabinet

Material: high quality 15mm 11 times folded birch plywood

Speakers: Celestion Vintage 30 + Celestion G12T75

Power rating: 120W RMS

Impedance: 8 Ohm

Dimensions (W/H/D): 680 x 370 x 320 mm

Weight: 24 kg

 

HDR Automat na lasku;: image 1 of 5
HDR Automat na lasku;: image 2 of 5 HDR Automat na lasku;: image 3 of 5
HDR Automat na lasku;: image 4 of 5 HDR Automat na lasku;: image 5 of 5
Automat na lasku

A very special 3-channel head built for Václav Vaňura aka Láska, the lead guitarist of Zakázaný ovoce (= Ukradený ovoce).

Ukradeny ovoce

FEATURES:

Channel 1:
From a shimmering clean tone to a cutting crunch with a distinctive "plexi" flavour.
Bright/warm switches between two different brightness settings to suit different instruments.

Channel 2:
A huge "800-ish" rock sound.
Brit / fat toggles between a sharper British rock sound and a greasier, more saturated sound. This is very useful especially with single-coil pickups.

Chanell 3:
JCM800 on steroids!
Deep /norm toggles between a normal and a little more "heavy" voicing with an emphasized low end.

Bass, Middle, Treble a Presence common for all channels

All-tube Series Effects Loop

Solo boost - a footswichable volume boost for solo playing

Output Volume control sets overall volume after the fx loop

Spring Reverb - tube-driven, vintage style circuit

Depth - enhances a low-end response of the poweramp

SPECIFICATIONS:

Preamp: 3x ECC83 (12AX7)

Reverb: 1x ECC81 (12AT7)

Poweramp: 1x ECC83 (12AX7) , 2x EL34 / 50W

Dimensions (W/H/D): 480 x 220 x 280 mm

 

 

HDR "3+" two-channel hi-gain head;: image 1 of 5
HDR "3+" two-channel hi-gain head;: image 2 of 5 HDR "3+" two-channel hi-gain head;: image 3 of 5
HDR "3+" two-channel hi-gain head;: image 4 of 5 HDR "3+" two-channel hi-gain head;: image 5 of 5
3+

This compact hi-gain head was derived directly from our four-channel flagship. We used Flagship's channels 1 and 4 and created this wine-red beauty.

FEATURES:

Channel 1 - Clean:
Clean mode - a transparent clean sound, classic fender topology with eq after the first gain stage
Fat mode - based on Clean mode, however its enhanced mid-frequencies enable a slight overdrive

Channel 2 - Rhythm:
An "almost hi-gain" mode with strong attack and tight bass. Great for classic rock, 80's metal and much more.

Channel 3 - Lead:
Lead mode - our distinctive HDR modern hi-gain with emphasis on upper mids that cuts through any mix very well
Lead+ mode - based on the Lead mode but it has a different eq contour with scooped mids and more agressive poweramp voicing; the heaviest mode of all

Bass, Middle, Treble and Presence independent on all channels

All-tube Series FX Loop with an adjustable Send Level, footswitchable

Output Volume control sets overall volume after the fx loop

Solo boost - a footswichable volume boost for solo playing

Depth - enhances a low-end response of the poweramp

SPECIFICATIONS:

Preamp: 4x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2x KT88 / 95W

Dimensions (W/H/D): 660 x 260 x 260 mm

 

HDR "2x2": image 1 of 9
HDR "2x2": image 2 of 9 HDR "Custom Superior": image 3 of 9
HDR "Custom Superior" ;: image 4 of 9 HDR "Custom Superior": image 5 of 9
HDR "Custom Superior": image 7 of 9 HDR "Custom Superior": image 7 of 10
   
HDR "2x2": image 8 of 9 HDR "Custom Superior": image 9 of 9
Custom Superior

A very special head that puts two thoroughly different sounds into one amplifier.

FEATURES:

Channel 1 - Vintage Clean & Drive:
Clean mode - a classic American clean inspired by a popular deluxe/deville topology. Not a crystal-clean glassy sound, rather a little dirty, with great harmonics.
Drive mode - turns the Clean mode into a cutting rock-n-roll drive with a simple click of a footswitch. A hot crunch sound that cleans up well with a guitar's volume knob as well.

Channel 2 - Modern Lead:
A perfect opposite of the first channel. Based on the iconic Van Halen modern hi-gain sound, the Lead Channel offers much more gain than you would expect from such a vingate looking amp - truly a wolf in sheep's clothing.

All-tube Series FX Loop, footswitchable

An effect pedal can be placed in a shelf inside the headshell and connected to the fx loop permanently. What's more, the pedal can be powered by an integrated 9V DC power supply, so that you just plug in the footswitch and you can toggle the effect on and off.

Spring Reverb - tube-driven, vintage style circuit with a classic reverb drive transformer and a long spring reverb unit with extra long decay. In the signal path the reverb is placed after the fx loop, which is sonically superior to the before-the-loop solution found in most multi-channel amplifiers. Footswitchable.

Output Volume control sets overall volume after the fx loop

Solo boost - a footswichable volume boost for solo playing

SPECIFICATIONS:

Preamp: 6x ECC83 (12AX7)

Reverb: 1x ECC81 (12AT7)

Poweramp: 1x ECC83 (12AX7) , 2x 6L6GC (5881) / 50W

Dimensions (W/H/D): 660 x 260 x 260 mm

 

Custom Superior

A custom cabinet that matches the sound of the "Custom Superior" head. Solid birch wood adds some resonance and a unique "feel", too.
Tilt-back legs made of stainless steel are a very handy feature especially at crowded stages.

SPECIFICATIONS:

Construction: 2x12 enclosed horizontal cabinet

Material: 17mm solid birch wood

Speakers: 2x Celestion G12M Greenback

Power rating: 50W RMS

Impedance: 8 Ohm

Dimensions (W/H/D): 770 x 420 x 360 mm

Weight: 27 kg

 

HDR "Tau-3" two-channel hi-gain head;: image 1 of 5
HDR "Tau-3" two-channel hi-gain head;: image 2 of 5 HDR "Tau-3" two-channel hi-gain head;: image 3 of 5
HDR "Tau-3" two-channel hi-gain head;: image 4 of 5 HDR "Tau-3" two-channel hi-gain head;: image 5 of 5
Tau3

An eye-catching head, custom designed and built for Jaroslav Tauber, an immensely talented lead guitarist of a promising Czech rock band Plan B, a lecturer for guitar-head.cz and a student of
The Jaroslav Ježek Conservatory in Prague.

FEATURES:

Channel 1:
Clean mode - a transparent clean sound, classic fender topology with eq after the first gain stage
Fat mode - based on Clean mode, however its enhanced mid-frequencies enable a slight overdrive

Channel 2 - "British Green":
Vintage mode - old-school crunch based on the legendary "plexi"
Brit mode - a British rock sound reminding the 80's, the era of famous JCM800's" ruling the rock music
Lead mode - a modern hi-gain sound with a British flavour

Channel 3 - "Red":
Rhythm mode - in terms of gain this is an "almost hi-gain"" mode; with its outstanding articulation it suits fast riffs the best
Lead mode - proven HDR modern hi-gain with emphasis on upper mids that cuts through any mix very well
Lead+ mode - similar to Lead mode in terms of gain but with different eq voicing; scooped mids and boosted treble make it the most agressive mode of all

Bass, Middle, Treble and Presence independent on all channels

Two FX Loops, tube buffered:
1) Series FX Loop
with an adjustable Send Level
2) Parallel FX Loop with an adjustable Mix Level
Both the loops can be assigned to any channel, always switched on or footswitched.

Output Volume control sets overall volume after the fx loop

Solo boost - a footswichable volume boost for solo playing

Depth - enhances a low-end response of the poweramp

SPECIFICATIONS:

Preamp: 4x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2x KT88 / 95W

Dimensions (W/H/D): 700 x 260 x 260 mm

 

HDR "2x2" two-channel hi-gain head;: image 1 of 5
HDR "2x2" two-channel hi-gain head;: image 2 of 5 HDR "2x2" two-channel hi-gain head;: image 3 of 5
HDR "2x2" two-channel hi-gain head;: image 4 of 5 HDR "2x2" two-channel hi-gain head;: image 5 of 5
HDR 2x2

A rock-solid two-channel head that fulfills all demands for a user friendly amplifier with reasonable amount of features and many tone possibilities.

FEATURES:

Channel 1:
Clean mode - a transparent clean sound, classic fender topology with eq after the first gain stage
Fat mode - based on Clean mode, however its enhanced mid-frequencies enable a slight overdrive

Channel 2:
Crunch mode - a bright rock sound with a little British "80's" flavour
Lead mode - an extremely articulate modern hi-gain suitable for even the heaviest of metal genres

Bass, Middle, Treble and Presence independent on both channels

All-tube Series FX Loop with an adjustable Send Level, footswitchable

Output Volume control sets overall volume after the fx loop

Solo boost - a footswichable volume boost for solo playing

Depth - a very useful feature that enhances a low-end response of the poweramp; great for huge yet tight bass

SPECIFICATIONS:

Preamp: 4x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2x 6L6GC / 60W (up to 90W using KT88)

Dimensions (W/H/D): 700 x 260 x 260 mm

 

HDR Amplification 2x12 vertical oversize: image 1 0f 3 thumb
HDR Amplification 2x12 vertical oversize: image 2 0f 3 thumb HDR Amplification 2x12 vertical oversize: image 3 0f 3 thumb

One might think that a photo of a 4x12 cabinet crept in by mistake, therefore we add a shot with front grille removed. What are advantages of this unconventional design since lightweight 4x12 cabinets are only a few kilograms heavier? There is a resemblance between guitar cabinets and sportscars: a powerful engine is worthless without adequate suspension, brakes, etc. Similarly, guitar cab require adequete construction to use full speakers' power. Compared to lightest 4x12 cabinets, this huge 2x12 cab can be much stiffer and more resistent to undesired mechanical vibrations, hence tighter and more articulate sounding.

SPECIFICATIONS:

Construction: 2x12 enclosed vertical cabinet, slanted

Material: high quality 18mm 13 times folded birch plywood

Speakers: 2x Celestion Vintage 30 (different speakers as an option)

Power rating: 120W RMS

Impedance: 8 Ohm

Dimensions (W/H/D): 700 mm x 715 x 360 mm

Weight: 36,5 kg

 

HDR "Plexi": image 1 of 7
HDR "Plexi": image 2 of 7 HDR "Plexi": image 3 of 7
HDR "Plexi": image 4 of 7 HDR "Plexi": image 5 of 7
HDR "Plexi": image 6 of 7 HDR "Plexi": image 7 of 7
HDR Plexi

One of the most interesting facts about the famous "Plexi", an archetype of the classic "British sound", is that it originated as a Fender Bassman clone. Today, we can think of it as the perfect example of how very similar circuits (schematics) sounding very unalike due to different components such as tubes, transformers or capacitors. Furthemore, the significance of power supply should not be underestimated since it has a considerable influence on amplifier's frequency response and dynamics.

FEATURES:

Classic "Plexi" Style Inputs: Low & High Input 1 - Bright, Low & High Input 2 - Normal

Gain 1 - Normal, Gain 2 - Bright; the inputs can be blended together at any required ratio

Bass, Middle and Treble Controls

Master Volume Control enables to get nice overdriven tones at lower volumes

Classic Bassman / Plexi style Presence Control

Custom built solid birch headshell, red stain, acrylic urethane glossy finish

SPECIFICATIONS:

Preamp: 2x ECC83 (12AX7)

Poweramp: 1x ECC83 (12AX7) , 2x EL34 / 50W

Dimensions (W/H/D): 490 x 230 x 205 mm

 

HDR "Deluxe": image 1 of 5
HDR "Deluxe": image 2 of 5 HDR "Deluxe": image 3 of 5
HDR "Deluxe": image 4 of 5 HDR "Deluxe": image 5 of 5
HDR Plexi

This handy combo combines Bassman style preamp with a very dynamic 2x6V6 / 20W poweramp (similar to some Deluxe models)

The combo is built of solid pine wood, much like old Fender combos and cabs. In comparison to common plywood construction the solid pine adds some resonce and it is an important ingredient of the appreciated vintage American tone.

FEATURES:

Two Inputs: Input 1 - Normal, Input 2 - Bright (Bassman style, "low" inputs omitted)

Gain 1 - Normal, Gain 2 - Bright; the inputs can be blended together at any required ratio

Bass, Middle and Treble Controls

Master Volume Control enables to get nice overdriven tones at bedroom volumes

Classic Bassman / Plexi style Presence Control

SPECIFICATIONS:

Preamp: 2x ECC83 (12AX7)

Poweramp: 1x JJ ECC81 (12AU7), 2x JJ 6V6S / 20W

Speaker: Celestion Classic Lead, 80W, 99dB
(the customer's choice in order to minimize speaker distortion at higher volumes; a vintage style speaker with an AlNiCo magnet could be a great option as well)

Dimensions (W/H/D): 470 x 440 x 230 mm

 

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