[Heathkit] Chinese 572B's in a SB200

[km1h]

I recently bought some from that auction site and I cant seem to tame them down. Ive used other Chinese 572B's without problems but I recently used up my stash. 

I remember problems using some tubes in the Yaseu FL2100 series, relating to the import tubes requiring a different operating bias. Anybody able to relate that to Heathkits?

Anybody have a good pair of USA tubes for sale??

Carl
KM1H