6CA7/EL34 Tube Reviews

The EL34 (6CA7) is a large octal power pentode delivering roughly 35 to 50 watts per push-pull pair. It is the voice of classic Marshall guitar amps and of hi-fi designs such as the Dynaco ST-70, with a reputation for a rich, forward midrange.

Vintage Mullard EL34s are the benchmark, and current production includes JJ, Electro-Harmonix, Tung-Sol, Psvane and others. Below are our listening reviews of EL34 and 6CA7 tubes with reader star ratings. See also our KT88/6550 and EL84 reviews.

Top-rated 6CA7s

  1. Matsushita EL34/6CA7 Japan4.0 · 46 votes
  2. Tesla EL34 Red Base Czechoslovakia3.9 · 29 votes
  3. Mullard EL34 Russia3.8 · 18 votes
  4. Electro-Harmonix 6CA7 Russia3.7 · 23 votes
  5. Mullard EL34 Metal Base3.7 · 17 votes

Ranked by reader star ratings (3+ votes).

Matsushita EL34/6CA7 Japan

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Matsushita EL34/6CA7 Japan

(46 votes, average: 3.96 out of 5)

This one is a bit of a secret, but I will let it out.

The Matsushita EL34 is not a well-known tube even 50 years after it was produced. Very few people know about it, but they should. Matsushita used Mullard equipment to produce its glass, and the result is the exact same sound as the Mullard Xf2 EL34—one of the most desirable EL34 variants in existence.

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Tesla EL34 Red Base Czechoslovakia

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Tesla EL34 Red Base Czechoslovakia

(29 votes, average: 3.90 out of 5)

And here we go again with the Tesla EL34 Red Base—to be clear, we are talking about the original vintage production, not the modern JJ reissues. Given that the Tesla E83CC is one of my absolute favorite 12AX7 variants, I had massive expectations for their EL34, and I was certainly not disappointed.

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Mullard EL34 Russia

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Mullard EL34 Russia

(18 votes, average: 3.78 out of 5)

The Mullard EL34 Russia is a rare success story in the world of modern vacuum tubes. Honestly, my expectations were low after testing numerous new production preamp tubes that failed to live up to the hype. However, the reissue Mullard provided a genuine shock to the system. After swapping out a set of classic RCA 6L6GC black plates and spending some time with the Mullards, I found myself making the unthinkable decision to keep the new production glass in the amp over the vintage RCAs.

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Mullard EL34 Metal Base

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Mullard EL34 Metal base

(17 votes, average: 3.65 out of 5)

We are discussing one of the most desired output tubes in existence! Why does the Mullard EL34 Metal Base command such a high price, and is it truly worth the investment? To understand its value, we must look at its unique origin: while branded as Mullard, this treasure was actually manufactured by Philips in Holland. While later versions like the xF1 were produced at the famous Blackburn factory, these metal-base variants—also found with Amperex Bugle Boy silk screens—all originate from the same superior Dutch facility.

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