Harma Valves / EL34-HARMA RETRO

EL34-HARMA RETRO EL34-HARMA RETRO Click on image(s) above to view larger
£32.00

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A test report is available click here to view

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 EL34 Retro is based on the famous Mullard EL34 and has a number of important features which set the valve apart from other EL34 types.

The grids of the valve use a block construction which enables the valve to provide smoother output and eliminating odd order harmonics. The anode plates are constructed using a laminated alloy which gives better heat transfer under overload conditions. This results in a tight bass response, balanced warm midrange sound stage and clean clear treble response. The construction is then housed in a thick glass envelope that not only adds strength but also provides lower michrophoney.

The use of high quality components results in a harmonically rich audio response that perfectly recreates that famous Mullard sound whether for Audio or guitar applications.

In Audio application It has a clear musical presentation with accurate note and instrument placement .It has a rhythmical clear bass response with a fast dynamic sound and smooth detail top end.
In guitar amplifier application The Harma EL34 Retro recreates the tight low end depth and has all the originals pronounced mid-range harmonic overtones.

This gives a wonderfully rounded midrange sound with a fat articulate tone. When you add a little gain into the mix the Retro provides a smooth and crunchy breakup.
Since it inception this has become one of our most popular EL34 valves for the above reasons.

All Harma Output valves are Dynamically Burst tested and undergo our own unique real world burst testing under real working conditions. The valve undergoes full drive testing which involves a series of varying timed electrical signal bursts that replicate the same stress conditions that the valve will encounter in your amplifier. Note No other supplier tests valves this way and why Harma valves have been used by the top Professionals. This is designed to ensure the ultimate reliability. The Harma valves have passed all the following tests:

Gain (m/A) Drive Tested)
Variable Signal Burst(Burst 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

All output 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.

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