It's not a drop-in.
The D3a is a pentode; the 5842 is a triode, and the pin outs are quite different, not to mention lots of other parameters........
A related thread.....
http://www.diyaudio.com/forums/tubelab/166090-substution-5842-input-tube.html
The D3a is a pentode; the 5842 is a triode, and the pin outs are quite different, not to mention lots of other parameters........
A related thread.....
http://www.diyaudio.com/forums/tubelab/166090-substution-5842-input-tube.html
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