? Amen, Phil. Ameritron's 1000pF of +HV bypass C is clearly not good engineering practice below 10MHz.. Rich, AG6K, 805-386-3734, www.vcnet.com/measures
? With a Pi-network Z-transformer, the peak in P output occurs when optimal power transfers. Around this point, there is virtually no change in anode current. The acid test is to use a dipmeter to d
? In my experiences, a Pi-network output matching network is not strictly at the frequency is is working on. For a Q of 10, resonance seemingly occurs c. 10% lower than the operating frequency. The
Greetings, Isaac ur welcome. The League deserves much of the credit. All of it. An HL-2200 is basically a SB-200/221 without the puke-green paint. Rich, AG6K, 805-386-3734, www.vcnet.com/measures
? Sounds good., Terry. And always check the choke for resonance locations with a dipmeter with the choke wired in place, unshorted, lest one fire up the choke (literally) when ''firing up''. Rich, A
? It does not matter because none of the materials used (tungsten, molybdneum, tantalum, copper, aluminum-oxide et cetera) are soft at room temperature. cheers, Jeff Rich, AG6K, 805-386-3734, www.vcn
Urethane can be removed with paint stripper paste. Urethane has an ok D-factor up to 14kW. Varathane? works ok. Rich, AG6K, 805-386-3734, www.vcnet.com/measures
? Dahl transformers have low winding resistance because he uses a high Mu Hipersil ? core. High-Mu enables him to use a minimal number of turns, which provides room for using larger diameter wire. F
? Tnx. This type of dielectric is not rated for tuned circuit applications, however it works ok for bypass and coupling applications. For 1.8MHz padders, 2000v mica caps are good. See Cornell-Dublie
** Provided that the drive level is constant, grid current jumping around is an indicator of loose gold meltballs on the anode/grid ceramic insulator. Tapping the tube firmly with the anode/plate ca