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I just picked up about 140 more cards for the 121. Mostly series string stuff in the 2-5 filament volt range. That's cool because I mostly do TV tube testing, but I'd really like the 6 volt cards too. Luckily, I do have some overlap like a 5BR8 / 6BR8 or 3CB6 / 6CB6. There only seems to be a two hole difference between them. I figure I can use those like a Rosetta stone to decode the filament holes.
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