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Old 14th Jul 2019, 8:01 pm   #16
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: Armstrong 621 and 625 rebuild and transplant

It seems to be within the ratings of a BC547 (or the lower-noise BC549), but watch out for the pinout. BC547/549 have the base in the middle.
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