[ARC5] SCR-183/-283 4-5 MC Coil on 75 MTRs

[Brian Clarke]

Hello Neil,

Sorry I can't be more specific. I have exactly the same RCA Tx tube book. I looked in the RCA Rx tube book and there's no info about the 6J5 or the 12J5 - but mine is a relatively recent edition. I do have older editions in the ceiling, but that's a difficult job. My Philips Miniwatt valve data book is no more helpful. The only other source I have is the 5-volume set of the RCA tube handbook that I picked up at a swapmeet in California; unfortunately, it must have been 'dropped' at some time because all the pages are out of order - putting it back in order is on my To Do list.

My only other suggestion is to put the 1626 on a valve tester, vary the plate Voltage and the grid Voltage and plot actual plate characteristics. Then draw your Class C load line.

73 de Brian, VK2GCE.

On Tuesday, July 08, 2014 9:59 PM, you said:
  > Look up the operating data and the plate characteristics for a 12J5. Then do the calculations for Class C.
  >
  > 73 de Brian, VK2GCE.


  Thank you Brian.


  I think I can actually do better than that. I have the RCA Transmitting Tubes manual for 1956 (price one dollar!) and it lists the maximum CCS ratings for the 1626 when used as RF Power Amplifier and Oscillator - Class C.


  Unfortunately it doesn't give typical operating conditions, hence my questions about plate current and bias resistor.


  Max plate voltage, current, and dissipation are 250V, 25mA, and 6.25W. I think I could probably run it at 5W and get between 3 and 4 watts out of it.


  73 de Neil ZL1ANM