I just went though a series of tests, which included the new Electro-Harmonix branded EL-34 and 12AX7 tubes. Electro-Harmonix tubes are distributed by New Sensor in New York, who is also the importer/ distributor of the Sovtek line of tubes. In my opinion, there is very little or no performance difference in these two lines of tubes. I have only tested the 12AX7 and the EL34 so far, but can assure you, they are not competition for NOS European tubes. I am just now testing the Electro-Harmonix EL34 against the Tesla E34L. I would give the Tesla the edge right now, with my "reference" tube ( Mullard EL34 ) destroying them both in the regions of midrange resolution and purity, as well as delicacy of highs and the signature mid bass "punch" the Mullard is known for. I should point out that the EH and Tesla both retail for approximately $17.00 each. The NOS Mullard can easily run as high as $100.00 each, making this comparison hardly equal in the budget department. I should commend the Russians for making very good tubes available for a very reasonable price, as the NOS variety are not available in sufficient quantity (or value) for ANY manufacturer to be able to offer them as original equipment.
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