Four strings bass guitar

With bronze string fittings.

Four strings electric bass guitar

Guitar Data

  • Dimensions

    • Overall lenght:1130mm / 441/2''
    • Body width: 340mm / 133/8''
    • Body thickness: 56mm / 21/4''
    • Neck depth: 23mm / 29/32''
    • Neck width nut: 39mm / 117/32''
    • Scale lenght: 890mm / 35''
    • String spread nut: 31mm
    • String spread bridge:mm
    • Weight: 4.95 kg
    • Fingerboard: 24 frets,
      radius - 254mm / 10''
  • Components

    • Tunners: 3x3 Schaller BM Light Gold
    • Nut: Bronze
    • Truss rod: carbon
    • Bridge: 4x independent fixed bronze 1/2'' cylinders
    • Tail piece: Brass, inset in body
    • 2 copper control knobs with push/pull switches
    • Copoper strap pins
    • Gold round recessed socket for 6,3 mm mono output jack
    • Strings: D'Addario EXPR 165 steel copper plated (.45/.65/.85/105)
    • Frets: 3mm special bronze Syntoms
  • Electrics

    • 1 linear 250k potentiometer for volume control with pull up kill switch
    • 1 linear 250k potentiometer for tone control, switch to change two capacitors values
    • 6 way switch Freeway
    • Seymour Duncan NYC - neck
    • Seymour Duncan NYC - bridge
  • Material

    • Body: European ash
    • Top: American wallnut
    • Neck: American ash
    • Fingerboard: Ebony
    • Controls cavity cover plate: wallnut
    • 3.3mm Ivory dots on fingerboard
    • High solids epoxy base coat - Morrels
    • Transparent melamine lacquer, gloss - Morrels
HERA 800x300

Four string electric bass guitar ZR Hera - description

When I designed this instrument I put the accent on material quality and simplified construction. All metal components are custom made to harmonize their shapes and sizes with wooden parts of the guitar body. None of the components disturbs nice wooden surface. Brass tailpiece block is hidden under the wallnut top. Four independent cylinders are inset into the surface and they support each string individually. It provides maximal separation of strings and prevent vibration transfer between them. Bridge cylinders and nut are made of high quality bronze. This material is harder than brass but still well workable. It has a perfect sound characteristic. The only disadvantage of this solution are dificulties when changing type of strings or tunning. It requires more work to set the strings in tune on all frets. There has been used Syntoms special bronze frets to match quality of the bridge and nut. D'Addario EXPR steel strings are copper coated. Brightly sounding character of steel core is slightly change by the copper coat to give a bit more of acoustic character to the final sound.

This bass guitar has a neck through body. Neck is made from two pieces of straight-grained American ash. European ash was used for body. There are two large cavities on both side of body covered by beatifull american wallnut top. There is only a small round plate on the back side to access one cavity for wiring. A guitar body is quiet thick (56mm) and large to produce more wood responds to string vibration. Weight has been reduced by cavities and light Schaller BM tunners. ZR Hera Bass guitar is well ballanced on the strap by body extension. Ebony fingerboard is easily accessible along the whole length. Neck has a rounded C profile on the nut side and a bit more flatten shape on the body side. Two carbon rods has been used to support neck.

There is a set of Seymour Duncan NYC bass pickups installed without trims. These are humbucker style pickups with four conductors to allow variety of connections. Wires are connected to modern Freeway switch with 6 positions. Three positions connect both coils in normal series mode and three positions connect only one coil of each pickup. Outgoing sound is controlled by a large knob on 250k volume potentiometer with pull up kill switch. There is a smaller copper knob on the linear 250k potentiometer also fitted with a push/pull switch. Tonal character can be modified by two different capacitor values connected to the the switch.

Overall this bass guitar has a unique character. It sounds clearly and warmly with lot of harmonics. Natural sound sustain without amplification is audiable up to 40 seconds. Even the small number of electric circuit controllers visible on the surface provide a lot of options. I named this instrument after the Greek goddess Hera and to pay a tribute to my friends from HERA Rock, Prachatice.

Zdenek Rumler, 1st of March 2016

Sound samples:

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ZR Guitars Hera 1 ZR Guitars Hera 3



Unit 4, Dale House
M40 8EF
United Kingdom

UK Seller:

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Sales information

Manufacturing of this guitar can be ordered with the same components and wiring as described or with the options available in the order form. Total price depends on the individual requirements and components cost. We will require Ł500,- deposit after the order approval and before the start of guitar making. In the order request form, if it is available, you can choose from several options and add your requirements. Estimated manufacturing time is 12 weeks. You can fill and email us the order form for actual price quotation.
You can read all details about the shopping process in the link bellow.

Every guitar includes a certificate of ownership. A direct purchase or placing order is possible only through this website or authorized seller shop. We provide (in compliance with all specified conditions) warranty period of three years to instrument construction and all of its components except to strings and accesories. We offer to dispatch finished instrument worldwide for the price stated in the order. In the case of the request for different pickups we are willing to meet the custom requirement, but only after preliminary agreement before placing the order (required pickups must conform to quality, dimension and their wiring must allow required connection).

Thank you for your interest.

More info here