The OP confirmed that the HV is indeed 1000 volts low. Doing the math, it
works out that someone switched the rectifier from a doubler to a FWB.
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-----Original Message-----
From: Alek Petkovic <vk6apk@bigpond.com>
To: AMPS <amps@contesting.com>
Sent: Fri, Jul 21, 2017 07:34 PM
Subject: Re: [Amps] Clipperton L
Yes. The HV probe is the first thing.
Then, change out those metering resistors as well, while you're at it.
Make up the 3 megohms with a string of smaller value, appropriately
rated resistors.
It may bring your voltage reading back up to normal. If this is the
case, then you merely have a soft set of 572B tubes.
73, Alek.
VK6APK
On 22/07/2017 6:41 AM, Jim W7RY wrote:
> I would suspect the electrolytics. But without proper test equipment
> your just guessing. As suggested, a HV probe. And most good DVMs have
> a capacitor checker built in.
>
> Good luck
> 73
> Jim W7RY
>
>
>
> -----Original Message----- From: Kelly Taylor
> Sent: Friday, July 21, 2017 9:46 AM
> To: Russ Williams via Amps
> Subject: [Amps] Clipperton L
>
> Update: just checked the transformer primary: appears to be fine (both
> halves).
>
> Put it back together and turned it on again, and was surprised to see
> Vp now at 1700 volts, then realized that was in SSB, so it's still 1kv
> low.
>
> At 1700 volts, I can get about 600w on 40,20 and 15. Which, accounting
> for efficiency, is probably right about what you can expect for 1kw DC.
>
> So am I right in thinking all signs point to the HV circuit? Something
> in the voltage doubler? Could a leaky bypass cap (which is upstream of
> the ‘fuses’ (a pair of 1 ohm resistors paralleled and in series
> between PS and plate choke) drag down the voltage?
>
> (In case you’re just arriving in this thread: yes, the primary circuit
> is wired correctly for 120v; no, the circuit board has not been
> rewired to accommodate 811s, no fuses blow and no smoke has been
> released (yet).)
>
> 73, kelly, ve4xt
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