[TenTec] Kudos to TenTec Service

[Kim Elmore]

Well, that's interesting. The symptom was only on two bands... I wonder 
what the bias pots had to do with those bands?

In fact, here's a query for other O II owners: In CW mode, I notice that 
*only* on 12 and 15 m the transmitter is quite sensitive to any 
mismatch. If I don't use the internal tuner, even into a  dummy load, I 
see a minor reduction in power output and an odd behavior in the ALC 
light: as I advance the MULIT control tp adjust PWR output, the LAC 
light will *extinguish* when I reach about 97 or 98 and the max power 
output will be about 80 W. But, if I first enable the internal tuner and 
allow it to find a match, the ALC light will stay lit all the way to 100 
and the power output will be ~85 W or so. Does anyone else notice such a 
characteristic?

N.B.: I really have no idea what the ALC light is really telling me in 
CW mode given that, from what I've been led to understand, the O II 
transmitter doesn't use "traditional" ALC.

Kim N5OP

On 7/21/2013 7:25 PM, Robert Mcgraw wrote:
> These pots are PA Bias and Driver Bias controls.
>
> A  diagnose, remove and replace and re-assemble, followed by a full
> "check-out" takes a 2 to 3 hours at least.  Then some "burn-in" time and
> then a "re-check" is necessary.   Yep, 3 to 4 total hours per unit is
> quite normal.
>
>
> 73
> Bob, K4TAX
>
>
>> Kim,  Most likely TT replaced two 1k pots in the final PA. Normally there
>> are two pots in the RF deck.
>>
>> Had my Jupiter back to they for service and ot was quick and painless.
>> Cannot say anything but good
>> service.
>>
>> Clayton N4ev
>>
>>
>>
>> ________________________________
>>   From: Kim Elmore <cw_de_n5op at sbcglobal.net>
>> To: tentec at contesting.com
>> Sent: Sunday, July 21, 2013 4:36 PM
>> Subject: [TenTec] Kudos to TenTec Service
>>
>>
>> I want to hand out kudos to TenTec service: I sent my O II in for service
>> because of reduced power output and odd ALC behavior on 12 and 15 m. It
>> took about 2 weeks for it to be repaired and sent back. Total cost of
>> parts was $12 and labor was $225, so it took someone about 3 h to do the
>> diagnosis and perform the repair. TT also replaced the RAM battery.
>> Shipping back to me was $87.53.
>>
>> The repair lists "Replaced 21k pots in final amplifier," but I don;t yet
>> know anything more than this. Since I don't have a schematic for the PA,
>> I don't know what the 21k pots referred to do. I'll call for some details
>> next week, simply because I'd like to understand better what the nature
>> of the problem was.
>>
>> Everything seems to be back to normal and, as an added bonus, TT replaced
>> the "rubber tires" that encircle the tuning knobs.
>>
>> Now I need to finish the refurbish on the AL-1200 I scored for ~$1600. I
>> replaced the bleeder resistors (two were open, but both showed flaws in
>> the vitreous coating), all the filter capacitors (adding one to the
>> string), set the B+ to 4kV with the HV transformer tap, added an internal
>> PIN diode QSK switch and the associated keying loop, and replaced the
>> dial lights with LEDs. All I need now is a replacement meter switch (on
>> its way) and I should be cooking with a new amp.
>>
>> Kim N5OP
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>