• 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.

Replacing Tubes

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UKTwister

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Joined 2004
#1
Hey im quite a beginner with tube amps.

i own a engl screamer 50 combo with the following specs:

50 watts classA
2x GL6GC matched set
1x 12ax7 FQ grade
2x 12ax7 selected
1x 12ax7 standard
celestian v80 speaker


Both the Gl6GC's are broken and im wondering how i go about replacing them..

am i best just buying the same model tube from groovetubes/sovtek or can you recommend something better? and will i need to rebias my amplifier?

thanks
 
#2
Tube amps with adjustable bias need to be reset periodically, even if the O/P tubes are not replaced. Rebiasing is mandatory when the O/P tubes are replaced.

The "best" current production 6L6GC is the SED (Svetlana) made in the St. Petersburg (Russia) plant. The tubes are marked with a "flying C" logo. If you can't find a reliable UK or European source for the tubes, try Ned Carlson at Triode Electronics.

Triode Electronics: www.triodeelectronics.com
 
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