[Amps] Clipperton L soft

[Alek Petkovic]

Yeah. That's probably more plausible than the rectifier rewire theory.

73, Alek. VK6APK

On 21/07/2017 9:51 AM, Russ Williams via Amps wrote:
> Is it possibly running on 120 volts but wired for 240?
>
> RussKW6T
>
>        From: Kelly Taylor<ve4xt at me.com>
>   To: amps at contesting.com
>   Sent: Thursday, July 20, 2017 3:06 PM
>   Subject: [Amps] Clipperton L soft
>
> Hi all,
>
> Just trying to diagnose a weak Clip L.
>
> Here's what I see;
> On CW, the Vp meter shows 700 volts.
> The transformer, when isolated, reads five ohms to the low-power tap and eight ohms across the entire secondary
> The filter caps each start out showing short then gradually charge to then read the 100k of the parallel resistor.
> The diodes read low resistance forward and out of range reverse.
> The "fuses," two delicate resistors in series with the plate choke, and the choke itself, read very low in resistance
> Thinking I shouldn't trust the internal meter, but wary of servicing it live, I checked the values of the three resistors in series acting as a divider for the meter (each is off by 30%). The meter shunt resistor, again, isolated, reads within one per cent of spec.
>
> I don't want to drop $300 on tubes only to find nothing's changed, and don't want to drop $100 on a Harbach kit only to find it was just the tubes all along.
>
> Someone's been inside here before me; the electrolytics are not factory and there's some not-entirely-professional soldering, but the connections all seem fine electrically.
>
> Is the off-spec condition of the meter dividing network just a diversion from bad tubes?
>
> There's no evidence of any component having let out its smoke.
>
> 73, kelly, ve4xt
>
>
> Sent from my iPhone
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