Actually, Adrian, I'm glad I didn't buy one of those, because
finding short M5 metric screws here in the back-country of the USA
would have been a real challenge? 8-D
73,
Steve K0XP
On 12/7/2023 9:53 PM, Adrian Fewster
wrote:
toggle quoted message
Show quoted text
Great work Steve,? This doorknob would have been a good fit ;
HVCT8G-10KV-DL60-802M??? 10KV 8000PF??? N4700??? 10??? 8000???
20??? 60??? 15??? 20??? M5??? MURATA:DHS4E4A802KT2B
73
vk4tux
On 8/12/23 15:39, Steve wrote:
I did resolve the problem I'd been having with my 8410. From
time to time, it would seem to fault; the HV would drop to zero
after a few seconds, and if you were watching when it happened,
you'd notice the plate current LEDS suddenly lite all the way to
1.5A before dropping to zero. The curious thing to me was the
LEDs would remain lit up; yet, there was never a Fault LED. The
blower would shut off completely. This happened before I
connected the amplifier to my computer, so the amplifier was NOT
getting power for the LEDs from my USB line.
After awhile, I got around to examining things carefully, and
finally found this:
? 
I wound up replacing those with six paralleled 1000 pF/10 kV
discs, spread out so they wouldn't arc to one another, and the
amplifier has been working fine since. I suspect the caps were
blown due to high-SWR events, one at a time. I was very
surprised to find only six kilovolt discs being used where the
plate voltage was already half the voltage rating of the cap
leaving little margin for "mistakes".
TNX,
Steve K0XP
You receive all messages sent to this group.
View/Reply Online (#39723) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
Your Subscription | Contact Group Owner | Unsubscribe [vk4tux@...]
--
See my QRZ.com page at
