Carlos, Im would go for 220 Volts.
Current is half, and you may find regulation is better. If your Drake demand 240 volts and you supply 220 volts, you are running your filaments / heaters 8.3% under rating. This may lengthen their lives. On the other hand, if you need to build the boltage up a bit, I would suffest you get a transformer with, say, a 12 volt secondary, connect its primary to the supply and connect one lead of the Drake transformer primary to the supply, the other lead of the Drake transformer to one end of the 12 v transfdormer secondary, with the other lead of the 12 v secondary going to the supply. Measure the voltage across the Drake transfomer primary. If it is 220 v - 12 volts = 208 volts, then reverse the leads on the 12 volt secondary. This is a boost circuit that I have used sucessfully. You should end up with 232 volts across your Drake transformer primary. One caution, the 12 volt transformer secondary has to be able to take the current which flows in your Drake transformer primary If I am not making myself clear, then let me know and I will draw you a circuit diagram and email it to you. 73 Kevin VK3DAP / ZL2DAP > "Carlos Augusto S. Pereira" wrote: > > Dear friends, > > I am thinking seriously about changing the voltage in my shack. Today > I have 126V (measured) and I am afraid it can damage or shorten the > tubes life in my Drakes (B and C lines). Besides, my amplifiers (SB220 > with Peter Dahl Transformer and Ameritron AL80B) would work better > with 220V. My main problem is that brazilian energy companines provide > 127v or 220V and Drake equipments ask for 120 or 240v. > > What you guys think about that? > > 73 Carlos PY4RO > > Carlos Augusto S. Pereita PY4RO > www.qsl.net/py4ro > E-mail: [EMAIL PROTECTED] ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net ----------------------------------------------------------------------
