[Amps] Clipperton L soft
Kelly Taylor
ve4xt at me.com
Fri Jul 21 08:05:26 EDT 2017
Hi all,
Great responses so far, thanks.
To answer some of the suggestions; the primary is wired for the correct supply voltage (120), the factory board for the rectifier/filter components appears to jibe with the original schematic and it does provide some amplification, just not enough of it.
73, kelly, ve4xt
Sent from my iPhone
> On Jul 20, 2017, at 22:30, Alek Petkovic <vk6apk at bigpond.com> wrote:
>
> 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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