6A4, 46 and 47...excellent sound tubes !!!! - diyAudio
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Old 7th December 2012, 04:28 PM   #1
aldovan is offline aldovan  Brazil
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Join Date: Jul 2005
Location: Curitiba
Default 6A4, 46 and 47...excellent sound tubes !!!!


I'm currently testing the tubes 46, 47 and 6A4 in single ended triode and pentode modes.
I built a prototype in an aluminum tray.
I used a cardboard open baffle with a full range Trusonic 80FR and a Foster horn.
These old tubes play very well, watch the videos:

6A4 tube playing in pentode mode single ended class A:
Class A 6A4 direct heated pentode - YouTube

6A4 pentode in Class A - YouTube

46 tube playing in SE triode mode class A:
Cunninghnam 46 in triode mode. Class A - YouTube

Cunningham 46 in triode mode class A - YouTube

47 playing in SE pentode mode class A:
Raytheon 47 pentode in Single ended mode - YouTube

47 playing in SE triode mode class A:
Raytheon 47 in triode mode Single Ended Class A - YouTube

Which tube plays better in your opinion?

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Old 14th December 2012, 01:30 PM   #2
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sorry for that,i can not open the websites.
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Old 18th December 2012, 03:16 AM   #3
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47 in triode mode
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