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Old 31st August 2012, 03:10 PM   #1
pilovis is offline pilovis  Italy
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Smile Older tubes sound better

I've just modified my homemade tube amp to use two old 6V6G Fivre tubes from the 40's

One tube (the big one) is dated 1942 and has a label indicating "Italian Kingdom - Year XX of fascist era"
The other has the same label but with "Italian Republic" instead , I think this one is from 1948-49 and has also another label: "Magnadyne".

The sound is very good, considering also the two tubes are 70 years old.

Click the image to open in full size.

Last edited by pilovis; 31st August 2012 at 06:21 PM.
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Old 31st August 2012, 03:39 PM   #2
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Better than what? In what way do you made this affirmation? THD, power level, noise?

Surely, as the tubes becomes aged, they lost current capability, increasing its plate resistance, future underdamping more and more the moving parts of the speaker, so bass levels increase, and some people believes that bass is the only part of audio, ignoring middle and high frequencies.
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Old 31st August 2012, 03:53 PM   #3
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But which one is better, the Faschist or the Democratic? :P
Also they re too close to each other, do they have fights when you're not looking? :P
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Old 31st August 2012, 05:26 PM   #4
pilovis is offline pilovis  Italy
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Quote:
Originally Posted by costis_n View Post
But which one is better, the Faschist or the Democratic? :P
Also they re too close to each other, do they have fights when you're not looking? :P
LOL
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Old 31st August 2012, 06:00 PM   #5
disco is offline disco  Netherlands
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One thing for shure . . . elder tubes smell better than youngsters. Did you notice? If it's not in the clay from the thirties than it must be in the plastics. It makes me happy, anyhow.
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Old 31st August 2012, 06:53 PM   #6
iko is offline iko  Canada
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... but only older ears can detect the "old sound" signature.
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Old 31st August 2012, 07:17 PM   #7
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Quote:
One tube (the big one) is dated 1942 and has a label indicating "Italian Kingdom - Year XX of fascist era"
Use that one to play "Bella Ciao"

http://www.youtube.com/watch?v=4CI3lhyNKfo
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Old 31st August 2012, 07:18 PM   #8
disco is offline disco  Netherlands
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Iko, perhaps it's measurable?

- the expensive French scent of the R-type;
- the distinctive odor of Western Electric;
- the trail of a hunted monoplate;
etc etc
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Old 31st August 2012, 11:48 PM   #9
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Better than what? I found that the new 6SL7s and 6SN7s conform quite closely to the RCA created plate characteristics. They worked as they were supposed to in the completed design.

Good, bad, and indifferent VTs were made in all eras.
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Old 1st September 2012, 12:02 AM   #10
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Well the microphonic signature would be different - all that extra sound to blend in with the music to give it a warmth that you probably wouldn't find with a non-ST. Best to keep the amp near or on a speaker to accentuate the benefit ;-)
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