SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: Goodbye Type 45 ....... hello JJ 2A3-40

Posted by Rush Audio on October 12, 2016 at 06:02:53:
First post here :)

Don't blame the tube , it could easily be implementation related , assuming this is a DIY rather than commercial amplifier

Sounds like you have a power supply related issue . Swapping a type 45 to a 300B (or rather a 2.5V filament 300B in the case of the 2A3-40) , you were obviously using a suboptimal supply configuration for the type 45 , which IMO is one of the more perfect tubes out there . I suspect if you measure the output impedence with the 45 in place you will see anomalies which can be isolated to the power supply configuration . Inadequate reservoir capacitance is probably the culprit

John Rush