• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

6A4, 46 and 47...excellent sound tubes !!!!

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aldovan

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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? :D

Aldovan
 
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