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

[Mike Everette via ARC5]

I think there is an early RCA tube manual, probably from circa 1940, either on BAMA or on the "Boatanchor Pix" web site.

Not sure if it contains the 1626, but does have the 6J5 and 12J5.

73

Mike
WA4DLF
--------------------------------------------
On Tue, 7/8/14, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:

 Subject: Re: [ARC5] SCR-183/-283 4-5 MC Coil on 75 MTRs
 To: "AKLDGUY ." <neilb0627 at gmail.com>, "ARC-5 List" <arc5 at mailman.qth.net>
 Date: Tuesday, July 8, 2014, 8:59 AM
 
 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
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