6L6G Tung-Sol reissue: sweet sound and delicious night sight, but... - diyAudio
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Old 30th April 2015, 07:08 AM   #1
ygg-it is offline ygg-it  Italy
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Default 6L6G Tung-Sol reissue: sweet sound and delicious night sight, but...

From the web: "Tung-Sol are recreations of some of the most popular Audio and guitar valves. The Tung-Sol name and trademark have been recently acquired by the New Sensor Corporation. This new production Tungsol tube is manufactured at their Xpo-Pul factory (also known as Reflektor) in Saratov, Russia. New Sensor is an American corporation and since taking ownership of this factory has been steadily improving the quality of current production tubes.

The Tungsol 6L6-G tube (30 W beam-power tetrode) is a large bottle tube type for the look and sound of 6L6 tubes used during the golden age of hi-fi in the 1940's and early 1950's. This reissue Tung-sol 6L6G tube is rated to 6L6GC specs for improved performance and reliability in modern tube amplifiers."

My experience and just opinion:

Pros: direct replacement of EL34/ KT66/ 6L6GC (same pin out, less heater current); strong construction; elegant; lack of microphonics; crystal clear mids, sweet and extended highs; 3D-focused; the less fatiguing tube I ever tested; doesn't require hot bias to run the best (16.4W/55ma); works perfect on SE and triode mode; plays voices more emotional than KT66 and EL34

Cons: overweight, larger than EL34/ 6L6GC; expensive (2x); less bass than EH 6l6GC that exibits more "fat" bass, more THD distortion than GL KT66 that runs somewere quieter; i didn't find nothing vintage in the sound (but just good sound)

...but be aware: only after a very long run-in (i.e. tens of hours), the valve will show all its qualities, so be patient...

So to me TS 6L6G and GL KT66 run the best, but if you need "bass" go for EH 6L6GC

Now let admire my night view.. this is by far umbeatable!
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Last edited by ygg-it; 30th April 2015 at 07:11 AM.
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Old 30th April 2015, 05:41 PM   #2
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Join Date: Oct 2010
Location: Toronto, Ontario
Until about mid 2014 Parts Connection here in Toronto Canada was selling the
Tung Sol reissue 6L6G for $49.95 a match pair. I snapped up 2 quads when they
were having one of their 20% off everything sale.

Now I see they are selling them for more than double that price at $107 for a matched pair.
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Old 30th April 2015, 05:51 PM   #3
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Originally Posted by ygg-it View Post
less bass than EH 6l6GC that exibits more "fat" bass, more THD distortion than GL KT66
At the risk of being that guy (who am I kidding, I am that guy): Both frequency response and THD are determined by the circuit as a whole. The tube doesn't have a frequency response (in the audio range).

THD is a bit more complicated; if you run it open loop no NFB triode mode, then it matters how good the curves are. In most cases though, it's all in the circuit again.

In short: with a different circuit, you could get the opposite hearing impressions, or determine the tube tubes identical.
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Old 30th April 2015, 05:59 PM   #4
DF96 is offline DF96  England
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Yes. A valve has a frequency response which is fairly flat from DC up to VHF. There may be minor effects as the anode impedance interacts with OPT inductance, but I suspect most claims for "fat bass" etc. are actually distortion masquerading as perceptions of frequency response. In a different circuit at a different bias point almost everything is different.

Unless seriously faulty, output valves do not contribute significantly to circuit noise.
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Old 30th April 2015, 10:20 PM   #5
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A good way for the 6L6 GC is to use the 6L6 GC STR (Tungsol). Very good solution for replacing original 6L6 on Mac amp for example.
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