On 1/10/20 10:34, Levi C. Maaia - K6LCM via SBARC-list wrote:
Jay
Thanks for catching that. Those were my typos. Indeed he needs a 572B.
Looks like about 90 bucks from RF Parts, about double that for NOS Cetron which is out of stock.
https://www.rfparts.com/tubes/tubes-572b.html