[TenTec] Corsair I gone bad!

[Bwana Bob]

Joe:

I would replace both.  There is some debate as to whether a matched pair 
is required, but I read somewhere, maybe on this reflector, that a 
matched pair is s good idea because it results in lower distortion.  I 
put a matched pair of finals in my Century 22 after I blew them a couple 
of years ago. I considered the extra cost worth it.  Yes, if you have a 
final assembly from a part rig, that may save some cost and effort.  The 
Corsair, and Paragon used MRF458 finals and MRF476 drivers.  Don't 
forget to adjust the driver and final bias settings as described in the 
manual.

73,

Bob WB2VUF


On 11/3/2016 11:06 PM, k7mks at comcast.net wrote:
> Bob If one 458 blew do I have to replace both of them. I have a final assy out a parts rig and it might be easier to replace the whole assy if the transstosr check OK w a Simpson of Triplett VOM
>
> Joe
> ----- Original Message -----
>
> From: "Bwana Bob" <wb2vuf at verizon.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Thursday, November 3, 2016 6:18:21 PM
> Subject: Re: [TenTec] Corsair I gone bad!
>
> Joe:
>
>
> Don't despair (yet). You will have to open up the final compartment to
> see what smoked. Maybe one of the final transistors is blown, or maybe
> a capacitor shorted out.
>
> The MRF458 transistors are available from RF Parts:
> https://www.rfparts.com/catalogsearch/result/?q=MRF458
>
> 73,
>
> Bob WB2VUF
>
> On 11/3/2016 11:06 AM, Barry N1EU wrote:
>> dumb question, but where on a Corsair is there a hole big enough for a
>> mouse to get into?
>>
>> never mind, forget I asked . . .
>>
>> 73, Barry N1EU
>>
>> On Thu, Nov 3, 2016 at 10:43 AM, James Boswell <jboswell at nrao.edu> wrote:
>>
>>> On 11/2/2016 12:14 PM, k7mks at comcast.net wrote:
>>>
>>>> During testing thru a Bird 43 into a dRAKE
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> During testing thru a Bird 43 to a Drake KW dummy load my Corsair decided
>>>> to quit with a bang like a firecracker and a puff of smoke exiting from the
>>>> 3/8" hole in the top of the final assembly. The power supply breaker tripped
>>>>
>>>> After I recovered from this sudden turn of events I discovered that I
>>>> still had a working transmitte but could only get about 30-45 watts output
>>>> before the PS breaker tripped at about 14A or so.
>>>>
>>>> I strongly suspect my Corsair went from a nicely working radio to a
>>>> "parts unit" in an instant but decided to touch base with those that are
>>>> more comfortable with the events I've described. What likely went astray in
>>>> the RF final?
>>>>
>>>> 73 Joe K7MKS
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> KW
>>>> _______________________________________________
>>>> TenTec mailing list
>>>> TenTec at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>> Hello,
>>> I had a mouse build a nest in my Corsair, she ate much of the
>>> wiring harness. I would make you a deal on that radio.
>>>
>>> Interested?
>>>
>>> 73'S KA5SIW
>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus