Harma Valves / EF86-HARMA RETRO

EF86-HARMA RETRO EF86-HARMA RETRO Click on image(s) above to view larger

All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.

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 EF86 Retro is a recreation of the Mullard EF86 with the solid screen anode.

The original Mullard designed EF86 features the solid screen electrostatic barrel which wraps around the anode plate and is grounded. This design provide excellent screaming for hum and rigid internal support makes it very low on microphonics.

This low level of noise and hum results in many customers saying they consider the solid screen design better than the mesh screen design.

The EF86 is a high gain pentode that was designed to amplify low level audio signals and the Harma EF86 Retro recreates the warm classic vintage sound perfectly. It is therefore ideal in original Vox and Quad equipment and also an excellent choice to add warmth in tube microphones.

This valve offers the closest approach to the original EF86 sound and therefore is an excellent alternative to the Original Mullard.

The Harma EF86 is pictured with the Original Mullard item in picture 2

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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