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

[AKLDGUY .]

> 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.

Thank you. The thing is, the 1626 is rated as a Class-C
oscillator-amplifier, good to 30 MHz. That's why it appears in the RCA
Transmitting Tube manual.

I guess the manual didn't give typical operating conditions because
everything is fine so long as none of the maximum CCS ratings are exceeded
- plate voltage (250), plate current (25mA), and plate dissipation (6.25W).

So for an oscillator or amplifier, you find the self-bias or fixed-bias
setting at which neither of the latter two parameters are exceeded. Perhaps
it's that simple.

73 de Neil ZL1ANM


On Wed, Jul 9, 2014 at 9:03 AM, Mike Everette <radiocompass at yahoo.com>
wrote:

> 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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