Vacuum Tube - 7025, Electro-Harmonix

Vacuum Tube - 7025, Electro-Harmonix

Electro-Harmonix
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$16.39
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Electro-Harmonix has released a low noise, low microphonic version of the 12AX7 that meets all specifications required for the tube to be designated 7025. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics could be an issue. In order to ensure that the 7025 specification is consistently met, Electro-Harmonix has redesigned the structure of the 12AX7 and has implemented construction techniques to ensure the absolute lowest noise and microphonics possible. In all samples tested, noise and microphonics could not be detected.

"The Electro-Harmonix 7025EH has a mid-range that gives clarity and definition to the sound and a smooth top end for warmth and balance. With these characteristics, along with the exceptionally low noise and low microphonics, the Electro-Harmonix 7025EH will work equally well in vintage and modern high-gain guitar amplifiers, as well as sensitive phono preamps." -EHX

SKU:
T-7025-EH
Item ID:
043676
UPC/EAN:
683274026091
Brand:
Electro-Harmonix
Product Measurements by Type
BaseNoval
Base to Shoulder Height40mm ±2.5mm
Diameter22.5mm
Envelope Height49.5mm
Max Amplification Factor (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)110
Max Cathode Current10mA
Max Cathodes-Heater Voltage±200V
Max Filament Voltage Parallel6.6V
Max Filament Voltage Series13.2V
Max Grid Back Current (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)0.2mA
Max Grid Resistance per Triode Fixed Bias1MΩ
Max Grid Resistance per Triode Self Bias2.2MΩ
Max Heater Current 6.3V370mA
Max Heater Current 12.6V185mA
Max Plate Current (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)2mA
Max Plate Current Difference between triodes (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)±40%
Max Plate Dissipation per triode1W
Max Plate Voltage300V
Max Temperature at most heated part of envelope368
Min Amplification Factor (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)81
Min Cathode-Heater insulation resistance (filament 6.3V, cathode-heater voltage ±200V)20MΩ
Min Heater Current 6.3V325mA
Min Heater Current 12.6V162mA
Min Plate Current (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)0.75mA
Min Slope of characteristic (filament 6.3V, plate 250V, grid -2V, grid resistance 1MΩ)1.1mA/V
Nominal Heater Current 6.3V347mA
Nominal Heater Current 12.6V173mA
Total Height56.5mm
Packaging Information
Packaging Dimensions2.815 in. × 1.025 in. × 1.025 in.
Weight (Packaging)0.04 lbs.
JPEG: DatasheetAll Models

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Product Reviews

5.00 out of 5 based on 3 reviews
- July 9th, 2021
5 out of 5

I put these in V1, V2 and the PI slots of my early 1990s Fender Vibroverb reissue - very nice warm sound and no discernable noise or hiss - certainly a noticeable reduction in noise from the previous tubes, which were the 'blue lettered' Philips JAN 12AX7 (although I put those in ten years ago, so maybe they had worn out). After using the 7025EH I don't think I will bother buying NOS tubes anymore as these fit all my requirements.

- November 17th, 2020
5 out of 5

Great tube!
First, no cross-talk between triodes (thanks to shield between triodes), so when I turn the volume knob on my blfc Vibrolux amp all the way down, no sound from guitar comes thru the speakers. With Tung Sol 12AX7 reissue (which sounds brighter, but also very good, built more traditionaly, so has NO shield between triodes) I still could hear a bit of my guitar from the speakers with volume on the amp down thanks to crosstalk between triodes.
Second, GREAT sound! Warm and round, but still great articulation. If JJ ECC83s sounds mufled to you, try this new 7025EH there. If Tung Sol 12AX7 reissue sounds too sharp, try EH7025 there. It has very well balanced sound.No hard and piercing highs.
Third, I bought 4 pieces and no problems with microfonny, hiss and hum at all. Super. With Tung Sol 12AX7 sometimes I get a bad one with too much hiss.
Also to me, EH7025 sounds richer than Shuguang variants of 12AX7/ECC83/7025.
Thanks to EHX for new great tube.

- April 21st, 2020
5 out of 5

Excellent for V1 and V2. Very quiet with great tone.