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ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)

Electro Harmonix offers with the 7025EH a low noise and microphone version of the 12AX7 preamplifier tube. It will prove particularly effective in the first preamplification stages of an audio system, where noise and microphony can become a real problem. The brand carries out numerous tests to ensure the correct measurements of its tubes.
Average votes for this product
5.0 / 5
  Based on 6 customers reviews.

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19,08 € tax excl.
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3 >Month warranty
 
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Electro Harmonix 7025EH

Low Noise Preamplification Tube (12AX7 / ECC83)

Electro Harmonix 7025EH Tube de préamplification faible bruit (12AX7 / ECC83)

Electro Harmonix offers with the 7025EH a low noise and microphone version of the 12AX7 preamplifier tube. It will prove particularly effective in the first preamplification stages of an audio system, where noise and microphony can become a real problem. The brand carries out numerous tests to ensure the correct measurements of its tubes. The 7025EH is characterized by clear and precise midrange as well as soft and balanced highs.

Electro Harmonix 7025EH Tube de préamplification faible bruit (12AX7 / ECC83)

Connection diagram

Electro Harmonix 7025EH Tube de préamplification faible bruit (12AX7 / ECC83)
1Second triode plate
2Second triode grid
3Second triode cathode
4, 5, 9Heater
6First triode plate
7First triode grid
8First triode cathode
Electro Harmonix 7025EH Tube de préamplification faible bruit (12AX7 / ECC83) Electro Harmonix 7025EH Tube de préamplification faible bruit (12AX7 / ECC83)

Technical characteristics

Specifications
Product typePreamplification tube
Compatibility12AX7
ECC83
Contacts number9
Electrical parameter
ParameterConditionMin.NominalMax.
Heater currentFilament voltage 6.3V325mA347mA370mA
Filament voltage 12.6V162mA173mA185mA
Grid back currentFilament voltage 6.3V
Plate voltage 250V
Grid voltage 2V
Grid resistance 1MΩ		--0.2µA
Plate currentFilament voltage 6.3V
Plate voltage 250V
Grid voltage 2V		0.75mA-2mA
Plate current at the beginning of the characteristicsFilament voltage 6.3V
Plate voltage 250V
Grid voltage 2V		--±40%
Amplification factorFilament voltage 6.3V
Plate voltage 250V
Grid voltage 2V		82-110
Cathode-heater insulation resistanceFilament voltage 6.3V
Cathode-heater voltage ±200V		20MΩ--
Max permissible operating conditions
ParameterConditionMin.Max.
Filament voltageParallel connection6V6.6V
Serie connection12V13.2V
Plate voltage--300V
Cathode-heater voltage--±200V
Cathode current--10mA
Power dissipation at the plate of each triode--1W
Grid circuit resistance for each of the triodesFixed bias-1MΩ
Self bias-2.2MΩ
Temperature at the most heated part of the envelope--368K
 
Data sheet
Contacts number9
Tube typeN/A
 
Delivery

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Average votes
5.0 / 5
6 reviews
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Note :
 5/5
Date :
7025 pour restauration ampli Jolida JD202
Un tube de qualité, silencieux, visuellement très solide. Pas exactement le même gain que la 12AX7 d'origine, mais cela ne se ressent absolument pas dans mon ampli.
 (0)
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This review has been posted for ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
Note :
 5/5
Date :
Everything they promise and more
The quietest of the new and old (NOS) ecc83/12ax7 I have tested. I was surprised by its especially sweet and pleasant sound.
 (0)
 (0)
This review has been posted for ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
Note :
 5/5
Date :
Adorable....
Dans la famille des 12ax7...ces doubles triodes sont parmis les meilleures que j'aurais connu... Très bon équilibre, beaucoup de détails avec mon Préamp. Phono Marantz 7C, et le tout... Sans un bruit.... !!! Je recommande vivement.
 (0)
 (0)
This review has been posted for ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
Note :
 5/5
Date :
excellent
je modifie mon avis précédent sur le questionnement du fonctionnement réel du tube dans le Dynavox TPR-2. Le tube chauffe et donc est alimenté. Il me faudra encore du temps pour apprécier l'effet sur le son par rapport au tube d'origine mais il semble y avoir une amélioration.
 (0)
 (0)
This review has been posted for ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
Note :
 5/5
Date :
mis sur Dynavox TPR-2
Comme d'habitude, commande facile, livraison très rapide et super emballage pour ce produit fragile. Après, je me pose la question de la mise en fonction réelle de ce tube sur le préampli car aucune incandescence des filaments visible y compris après période de chauffe. (et une belle led rouge derrière la lampe mais n'en démontre pas le fonctionnement réel)
 (0)
 (0)
This review has been posted for ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
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ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
ELECTRO HARMONIX 7025EH Low Noise Preamplification Tube 12AX7 / ECC83 (Unit)
Electro Harmonix offers with the 7025EH a low noise and microphone version of the 12AX7 preamplifier tube. It will prove particularly effective in...

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