[Milsurplus] [ARC5] Screen Bias in ARC-5 Transmitters

[J. Forster]

Ooops. I see what you mean.

If you look at the prints, the 4 screens (2 in Mod; 2 in Tx)are pulled to
the plate, at 550 VDC, through the roughly 15k, R-89, so the screen
voltage depends on the screen current.

-John

==================






> On 25 Oct 2013 at 9:24, J. Forster wrote:
>
>> Hi,
>>
>> I am looking at the simplified Modulator print in AN 16-30ARC5-2, Fig
>> 4.2
>
> Oh. OK.
>
>> > On 24 Oct 2013 at 17:33, J. Forster wrote:
>> >
>> >> In CW, the VR tube is switched out, so the screen voltage will be
>> >> much higher...  probably 450 to 500 VDC.
>>
>> On 25 Oct 2013 at 9:24, J. Forster wrote:
>>
>> I never said 400-500 on the screen.
>
> See immediately above. I read that as "...probably 450 to 500 VDC..." on
> the
> screen.
>
> Well, then I misunderstood. It sure LOOKED like that is what you
> said/wrote....
>
> Sorry. I'll be more careful in future.
>
> Ken W7EKB
>
>