Harma Valves / 6N1P-EB-HARMA

6N1P-EB-HARMA 6N1P-EB-HARMA 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 6N1P-EB is a special long life version of the 6N1P which is very popular with high end audio users over recent years. Very robust and was selected for military use these are the best of the 6N1P. This valve has a better audio performance than standard 6N1-P as it has very low distortion and has a higher plate dissipation rating than an ECC88 type.

Special Quality Russian valves use letters E and B, P or V after the type number.
E for Long Life up to 5000 hours and B, P & V for mechanically improved tubes.

Some audio customers have used these in place of E88CC/6922 & ECC88/6DJ8 Types as the 6N1P-EB. This is due to better sonic performance due to the valves low distortion. It is similar to the above valves but the main difference is that the filament current is 0.55 A of the 6N1P-EB compared with 0.36 A of the ECC88/6922 type.

So if you are doing this substitution of 6N1P in place of ECC88/6922 type I would consult the manufacturer of you equipment. The 6N1P-EB is fully equivalent to the Chinese made 6N1 valve and offers better performance.

Features include very low distortion, medium transconductance, higher plate-voltage and dissipation rating than 6DJ8 types, and larger cathode than 6DJ8 types. This gives it longer life and more transient current capability.

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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