ECC83-HARMA RETRO BALANCED ECC83-HARMA RETRO BALANCED Click on image(s) above to view larger

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Harma valves consist of a selected range of valves that are chosen after meeting stringent standards for sound quality and reliability. These valves are sourced from current production as well as some of the finest Nos valves available. Unlike our competitors no Harma valves, past or present has been made in China. Harma valves represent the finest available items of their type available.

Harma valves are tested using a range of custom designed and built test rigs which are unique to Watford valves.These unique tests are not offered by any other valve supplier in the world.

All Harma pre amp valves undergo the drive rating system; the valve undergoes a series of through tests under full operational conditions. This involves a controlled burn in process to ensure perfect stability and correct ageing. A shock and vibration test, microphoney, hum, and a balance and symmetry test.

All Harma output valves undergo our own unique real world burst testing. No other supplier tests valves this way. The burst testing process involves a series of varying timed electrical signal bursts. This runs the valves under the same stress conditions that they will meet in your amplifier especially when overdriven. All out put valves are then dual matched by us on anode current and gain. This will ensure that you get the best selected valves available anywhere in the world.
The Harma ECC83 Retro balanced is a true sounding recreation of the famous Mullard ECC83.

This is a special balanced item with matched sections for use in phase inverter position, tube microphones or input positions where balanced operation is required.

The valve produces a harmonically rich and detailed sound with clear 3D midrange warmth. It has a very open and clear top end chime that gives the amplifier a rich sustaining tone when overdriven.

The valve has been specially designed to give a smooth harmonic slope which gives a warm crunch in guitar amplifiers when overdriven. To replicate the Mullard sound, the Harma ECC83 Retro has a mid boost which produces the warm detail and harmonically rich midrange that made the Mullard sound so famous. This design feature also has the benefit of reducing the upper end fizz and hardness that occurs in many modern day High gains pre amp circuits.

You will get improvements such as a crystal clear top end with more extension and clarity when used clean. When using the overdriven settings the valves characteristics and mid boost provide a warm sustaining sound with plenty of upper harmonics with excellent projection on solos.

This valve provides classic warm crunch harmonically rich 3 dimension midrange response that will bring the best out of any amplifier whether it has a vintage or modem day high gain circuit

All Harma preamp valves are Dynamically Drive tested under real working condition have passed the following tests:

Gain (db) Drive Tested)
Transconductance (gm) Drive Tested
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test



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