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EH 7025 (12AX7 / ECC83 HQ)

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.

Safety Information

Safety Information for Vacuum Tubes

For all electrical, electromechanical and mechanical components, the specifications and operating parameters arising from the respective type standard generally apply.
Further information, where available, can be found in the respective data sheets and product descriptions included with the product.

General Information

NOT SUITABLE FOR CHILDREN - choking hazard due to small parts
NOT SUITABLE FOR UNTRAINED PERSONS - danger to life due to high voltages
The safety and processing requirements applicable to the component must be observed
CE conformity applies only when installed professionally
Warranty becomes void in case of improper handling
The operator is responsible for proper installation
Local regulations and VDE provisions must be complied with
Never exceed the rated power
Never exceed the rated voltages and currents

Required Expertise

Use of measuring instruments (multimeter, oscilloscope) and evaluation of measurement results
Safe handling of high voltages (up to 500V and more)
Reading and understanding circuit diagrams
Selection of appropriate tools
Knowledge of electrical components and their characteristics
First-aid knowledge for electrical accidents
Knowledge of VDE regulations and safety requirements

Amplifier Tubes

Hazard due to high voltages
Hazard due to very high heat generation
Hazard due to glass breakage
Hazard due to UV radiation in case of defective tubes

Manufacturer

Herstellerinformationen | Manufacturer Information

New Sensor Corporation, 32-33 47th Avenue, Long Island City, NY 11101, USA

EU-Wirtschaftsakteur | EU Economic Operator
Tube-Town GmbH, Rumbergring 37, 66969 Lemberg, Germany, info@tube-town.de

Customer reviews (2)

Essential information about customer reviews We do not verify that the published reviews come from such consumers who have actually used or purchased the rated goods or services. All reviews, i.e. positive and negative, are published. No reviews that are unobjective, offensive or unrelated to the product will be published.

Laurent S., 01/16/2021

Top tube to get rid of microphony issue without having to make compromises on the tone. Works perfect in a Friedman Smallbox clone in V1 position.

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Vacuum Tube Damper made of silicon, helps to reduce noise and rattle of vacuum tubes. But it will not turn a bad tube into a good tube.
If a higher level of damping is needed, than use more than one damper per tube.

Inner diameter ca. 22 mm
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BEFORE ordering check the exact outer diameter of the vacuum tubes and compare it with the diameter of the damper to make sure that the damper fits.

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Mounting Information

Diameter: 12.2”
Overall depth: 5.3”
Cut-out diameter: 11.1”
Mounting slot dimensions: 0.31”
Number of mounting slots: 8

Thiele-Small Parameters

Resonant Frequency (Fs): 125.30 Hz
DC Resistance (Re): 8.05 Ohm
Coil Inductance (Le): 0.34 mH
Mechanical Q (Qms): 9.52
Electromagnetic Q (Qes): 1.35
Total Q (Qts): 1.18
Compliance Equiv. Vol. (Vas): 10.50 cu ft
Mech. Compliance of Susp. (Cms): 0.06 mm/N
BL Product (BL): 11.70 T-M
Diaphragm Mass Inc. Airload (Mms): 29.20 grams
Surface Area of Cone (Sd): 366.10 cm squared
Sound Pressure Level (spl): 99.63 db

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Note: Tubes equipped with long plates are commonly associated with a "warmer" or "richer" sound, whereas those with shorter plates tend to deliver a "tighter sound". However, tubes featuring long plates exhibit increased sensitivity to vibrations and mechanical disturbances, rendering them less ideal for critical applications.

Files

Datasheet

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Epoxy end fill meets UL94V-0
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Non polar

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Operating Tempeature Range: –55 ºC to +125 ºC (derate linearly to 50% rated voltage at 125 ºC)
Dielectric Withstand Voltage: .6 x rated voltage for 2 s @ +25 ºC ±5 ºC
Dissipation Factor (DF): tgd x 10–4 at +25 ºC ±5 ºC
Insulation Resistance: 10,000 MO x µF, 30,000 MO Min.
Self Inductance: 1 nH max. per 1 mm lead and body length
Life Test: 1000 hrs @ 85 ºC 1.25 x Vn
Damp Heat Test: 95% RH @ +45 ºC for 21 days
Soldering: 260 ºC ±5 ºC for 10 s ±1 s
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Epoxy end fill meets UL94V-0
Non inductively wound
Flame retardant outer wrap meets UL510
Non polar

Specifications:

Operating Tempeature Range: –55 ºC to +125 ºC (derate linearly to 50% rated voltage at 125 ºC)
Dielectric Withstand Voltage: .6 x rated voltage for 2 s @ +25 ºC ±5 ºC
Dissipation Factor (DF): tgd x 10–4 at +25 ºC ±5 ºC
Insulation Resistance: 10,000 MO x µF, 30,000 MO Min.
Self Inductance: 1 nH max. per 1 mm lead and body length
Life Test: 1000 hrs @ 85 ºC 1.25 x Vn
Damp Heat Test: 95% RH @ +45 ºC for 21 days
Soldering: 260 ºC ±5 ºC for 10 s ±1 s
Long Term Storage Stability: ?C/C = ±3% after 2 years

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