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

[Ian Wilson]

Note that the max plate dissipation is 5W, not 6.25W. The 6.25W
number appears in the RCA data sheet under typical conditions:
6.25W plate input, 4W RF output. This means that the plate dissipation
is 2.25W, comfortably under the 5W limit.

73, ian K3IMW



On Tue, Jul 8, 2014 at 4:59 AM, AKLDGUY . <neilb0627 at gmail.com> wrote:

> > 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
>
>
> On Tue, Jul 8, 2014 at 7:14 PM, Brian Clarke <
> brianclarke01 at optusnet.com.au>
> wrote:
>
> > Hello Neil,
> >
> > Look up the operating data and the plate characteristics for a 12J5. Then
> > do the calculations for Class C.
> >
> > 73 de Brian, VK2GCE.
> >
> > On: Tuesday, July 08, 2014 4:48 PM, You asked:
> >
> >
> >  Referring specifically to the BC-xx-230 model:
> >>
> >> How does one determine the setting for the roller inductor?
> >> Has anyone tried using the 1626 triode for VFO and PA?
> >> If so, what B+ and bias resistor did you use?
> >> What is the optimum 1626 PA plate current for CW?
> >>
> >> Any other useful hints?
> >>
> >> 73 de Neil ZL1ANM
> >>
> >
> >
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