NATIONAL MB-40SL ALL BAND TANK CIRCUIT FOR 80 through 10 METERS.
This all-band tank can be used as a no-bandswitching transmitter output circuit or as an interstage circuit, either in a plate or grid circuit, and either single-ended or balanced (push-pull) applications. Design and construction headaches are way down!
A complete description is available at http://www.amwindow.org/tech/pdf/mb40sl.pdf
I bought it brand new in 1952 or 1953, built it into an SSB exciter that I never finished and so the tank circuit has never been turned on. No arcs and no sparks! I was 17 when I built the exciter, and Iím 78 now, so the poor tank circuit, like me, has aged over 60 years. So, is it new or is it used? You decide!
I can attest though, that both the capacitor and the link turn smoothly! Besides, if your transmitter doesnít work quite right, you can always seek a refund from National Radio Co., Inc!
Fifty bucks via Paypal or USPO Money Order gets prompt insured shipment to CONUS or Canada. My address is good on QRZ.
Tnx es 73.
firstname.lastname@example.org or www.w8vr.org