Harma Valves / 6072A/12AY7-HARMA RETRO GOLD PIN

6072A/12AY7-HARMA RETRO GOLD PIN 6072A/12AY7-HARMA RETRO GOLD PIN Click on image(s) above to view larger
Select Test Options
  • Factory Tested
  • Balanced (Triodes)

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 6072A 12AY7 gold pin is a specially selected valve for use in high end audio, valve microphones and first position in guitar amplifiers.

The 6072A is a premium version of the 12AY7
that was used in early 50's Fender amplifiers. This valve is normally put in the first gain position to lower the gain of a pre amp circuit. This will reduce the gain by around 50-60% .

The Harma 6072A is designed on the famous General Electric 6072A with the 3 rib centre short anode plate, 22 mm glass envelope uprated from the 19mm of the original and gold pins.

Sonically the valve has lots of clean headroom and upper end transparency which makes them perfectly suited for critical audio applications. The valve also produces a warm rounded sound with low gain which will clean up and tame the harshest of pre amps. So this is the ideal choice for guitarists as many use this to lower gain in their preamps by substitution for 12AX7 in the first position. This is also a great option for harp players wishing to drop the gain of the amplifier in the input stage to prevent feedback.

We offer two options:
1) Selected & Drive Tested
2) Balanced -matched triode sections for Phase splitter, Audio & Tube microphones

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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