[HomeBrew] Need info/suggestions

n6kyr at netzero.net n6kyr at netzero.net
Wed Jul 13 07:46:43 EDT 2005


All:
I'm in the process of building a 2 tube cw transmitter (6AG7 with an OD3/VR-150 reg on the screen). It's going to be s/s on the rectifier, using an 80 uF/450 VDC filter (no choke,sorry). I have recently gotten a hold of a Stancor transformer rated at 440 VAC CT at 50 mA with a 6.3VAC/.5 A filament and a 25.2 VAC 100 mA xtra winding (perhaps a biasing winding). 

First off, on the transformer: I think it is good enough to handle the 6AG7 current demands. Does this sound right?

Also, I would like to place on the screen of the 6AG7 the VR-150 tube to stabilize the voltage "behind" the 47K screen supply resistor. Good enough to pipe down "the chirps?"

Finally, on the placement of the crystal socket, I may be placing the socket near some AC sources (about an 1" or so away from the pilot lamp and power switch). Now I shouldn't expect any hum pickup now, right? Let me know as I haven't punched the 7" by 5" by 2" chassis yet. I'd like to get any lingering tech issues out of the way before "Mr. Greenlee comes punching." 

73 de Cal, N6KYR/8

______________________________________________________________________
Surfing so fast you won't believe it's not broadband!
Try NetZero HiSpeed 3G.
Visit http://www.netzero.com to sign up today!



More information about the HomeBrew mailing list