Harma Valves / ECC82-HARMA STR BALANCED

ECC82-HARMA STR BALANCED ECC82-HARMA STR BALANCED Click on image(s) above to view larger
£26.00

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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.
Special Balanced item

This is a special balanced version with matched triode sections for use in in critical positions in Tube microphones, Tube compressors and phase inverter position in Audio & Guitar amplifiers where balanced operation is required.


The Harma ECC82 STR features an internally rugged construction with thick mica supports. This has a number of advantages such as reduced microphonics and better isolation from vibration. This is particularly useful in guitar combo applications.

The Harma ECC82 STR features gold plated grids winding with internal anode plate shield. The single ring getter sits on a double supported plate

The Harma ECC82 STR provides a warm and clear soundstage. They have a very clear bass response, which is both tight and musical.

The valve has excellent balance across the whole musical frequency range with instruments being clear, accurate and well defined. Indeed by having the most neutral and transparent sound has made this our most popular of all the current production ECC82 types for Audio applications.

These valves are all selected for low noise, low microphoney and are drive tested with a gain rating of between 229 and 249 digital points.

All Harma Balanced preamp valves are Dynamically Drive tested and matched on db gain under real working conditions and 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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