[TenTec] 961 power supply

[Dukes HiFi]

Sorry for the sort of contradiction.

These ARE easy to repair so long as it’s one of the three things I mentioned. However, the regulator PC board is far more complex than it needs to be and, especially with aging decoupling capacitors etc. pretty difficult to diagnose on a first principles basis. Replacing all of the caps might have fixed mine, but the surge that took out the semiconductors pretty well ended that project. It’s no longer worth the effort or expense.

I may just put in an LM230 adjustable regulator, feeding the pass elements, with an OVP and modernize this supply…

'

Gary


> On Jun 27, 2017, at 8:33 AM, Dukes HiFi <dukeshifi at comcast.net> wrote:
> 
> They’re not that hard to repair.
> 
> You have three first choices. 
> 
> 1) The rectifier bridge is shorted - R and R
> 2) The big filter cap is shorted - R and R
> 3) The supply is putting out too much and the OVP is operating. This should NOT pop the fuse though, this is a resettable SCR short that uses the current limit to deny power.
> 
> This antiquated circuit is difficult to troubleshoot if the problem is not one of the three things listed above. It is also sometimes even prone to oscillation. I have one in my basement that worked fine under no load but went into oscillation when the Omni 6 was turned on, in receive. It eventually took out nearly all of the semiconductors on the PC board and is now nothing but a parts mule.
> 
> Gary
> 
> W0DVN
> 
> 
>> On Jun 27, 2017, at 8:21 AM, Dry Martini Holding Company😎 <qrp at kg4kgl.net> wrote:
>> 
>> Well it blew the 4A fuse. It also instantly blew the replacement fuse. 
>> 
>> Is this worth fixing, or should I just look for a replacement?
>> 
>> Tnx,
>> 
>> Robert
>> KG4KGL 
>> 
>> 
>> 
>>> On Jun 23, 2017, at 11:11, Kimberly Elmore <cw_de_n5op at sbcglobal.net> wrote:
>>> 
>>> Chrome complains, too, but I find it complains often when there are no legitimate issues. TT is fine: simply click on Support > Service Policy. 
>>> Kim N5OP 
>>> 
>>>    From: Ralph <w8bvh at sbcglobal.net>
>>> To: Discussion of Ten-Tec Equipment <tentec at contesting.com> 
>>> Sent: Friday, June 23, 2017 6:54 AM
>>> Subject: Re: [TenTec] Prompt Ten Tec service
>>> 
>>> I use Firefox and the site came right up with no problems.
>>> 
>>> Ralph
>>> 
>>> w8bvh
>>> 
>>> 
>>> 
>>> 
>>>> On 6/22/2017 5:42 PM, Barry N1EU wrote:
>>>> That's a red herring Steve.  Just use a non-Mozilla browser if you don't
>>>> want to see that error.  Mozilla seems to be playing politics with the
>>>> StartCom SSL certificate issuing authority that TenTec.com uses:
>>>> 
>>>> 
>>>> 
>>>> *https://blog.mozilla.org/security/2016/10/24/distrusting-new-wosign-and-startcom-certificates/
>>>> <https://blog.mozilla.org/security/2016/10/24/distrusting-new-wosign-and-startcom-certificates/>*
>>>> 
>>>> *Barry N1EU*
>>>> 
>>>> On Thu, Jun 22, 2017 at 9:00 PM, Steve Ellington <steven4lq at gmail.com>
>>>> wrote:
>>>> 
>>>>> Well that's interesting.... Looks like Google blocks all of TT's links.
>>>>> Your connection is not private
>>>>> 
>>>>> Attackers might be trying to steal your information from *www.tentec.com
>>>>> <http://www.tentec.com>* (for example, passwords, messages, or credit
>>>>> cards).
>>>>> 
>>>>> NET::ERR_CERT_AUTHORITY_INVALID
>>>>> Automatically send some system information and page content to Google to
>>>>> help detect dangerous apps and sites. Privacy policy
>>>>> 
>>>>>> On Thu, Jun 22, 2017 at 3:35 PM, Josh Gibbs <gibbsjj at gmail.com> wrote:
>>>>>> 
>>>>>> You mean like this page here?
>>>>>> 
>>>>>> https://www.tentec.com/?page_id=143
>>>>>> 
>>>>>> "The service at tentec.com email is monitored Monday through Wednesday. At
>>>>>> this time we are unable to offer extensive telephone or email support for
>>>>>> amateur customers. "
>>>>>> 
>>>>>> They do need to address the security cert issue they have on their
>>>>> website.
>>>>>> Chrome is reporting it as 'unsafe'... ohhhh scary!
>>>>>> 
>>>>>> =)
>>>>>> 
>>>>>> 73!
>>>>>> 
>>>>>> -Josh
>>>>>> 
>>>>>> On Thu, Jun 22, 2017 at 12:24 PM, Steve Ellington <steven4lq at gmail.com>
>>>>>> wrote:
>>>>>> 
>>>>>>> What is so difficult about putting an email address on a website?
>>>>>>> Maybe customers are supposed to be "in the dark".
>>>>>>> 
>>>>>>> The Gentleman  N4LQ
>>>>>>> 
>>>>>>> On Thu, Jun 22, 2017 at 2:22 PM, Stuart Rohre <Rohre at arlut.utexas.ed
>> 
>> _______________________________________________
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> 
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