work up some kind of plastic fork wand thing a few feet long for
holding the IR thermometer close to the choke or just tape it to a
length of PVC.
thanks for the cap information.
73
Rob
K5UJ
On Mon, Jun 18, 2012 at 1:21 PM, Jim Barber <audioguy@q.com> wrote:
> That might be the right question.
>
> Starting at the supply end on the 77Dx:
> From the 15uH molded choke, there's .002uF to ground.
> At the junction of the 15uH and 90uH chokes, there's .005 total to ground.
>
> Again the two chokes are in series, with the 15uH going to the supply and
> the
> 90uH being the "main" choke.
>
> WRT input from Carl & Paul, I think what I'll do in the short term is add
> the additional bypass caps to make it fit the 77Dx schematic, fire it up and
> see what happens. The choke is far enough from the tube to measure temp with
> a non-contact IR gadget, or if I can't get good readings I can borrow a
> thermal imaging camera for a couple of days. ( I secretly lust for one
> anyway, but can't justify ~$2K to buy one) If the chokes or bypass caps get
> hot enough to worry about after a few 300-watt AM transmissions then I can
> consider what to do next.
>
> Thanks to all,
> Jim N7CXI
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