Nigel -
The fuse in question is inside the TR-7, and fuses the radio, with the
exception of the PA and Driver stages. So it's downstream from the
crowbar, which is in the PS-7 supply.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Nigel Gunn G8IFF/W8IFF wrote:
If the fuse is blowing I would suspect the over voltage crowbar is
doing it.
The lamps wont because the supply is current limited.
On 17-Feb-10 20:32, Garey Barrell wrote:
OK. Well Don's are a little different, but still a shorted LED should
not blow a fuse. I assume you just soldered the leads to the old
terminals? Possibly a short there.
I prefer the incandescent bulb / Lee Lighting #172 film setup too.
There is a reverse polarity protection diode just past the fuse, and the
supply lines to the PS-7 and ACC connectors are also "downstream".
If It's blowing the fuse, an ohmmeter check should show the situation.
You might have to reverse the ohmmeter leads to beat the polarity diode.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Craig Roberts wrote:
Hmmm. Well, that's not promising. The LEDs are not the bayonet-type
replacements. They're the "Don Buska" wired-in versions.
Nevertheless, I'm returning to the #53 lamps and sockets. If nothing
else, I like the original soft blue look better, too. Of course, I'll
still have the original mystery to solve.
Thanks, Garey.
Craig
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