[Amps] Looking for picture of SB220 interlock switch

[Joe Subich, W4TV]

No, recommending the removal of protective devices and removing them in
amplifiers you service is ridiculous.  I know that any technician in a
broadcast environment who removed crowbars or other safety circuits
would likely find themselves without a job.

I hope for your sake that none of your customers - or someone they sell
the modified amplifier to - is ever injured by high voltage.

73,

    ... Joe, W4TV


On 11/7/2013 5:39 PM, Carl wrote:
> Now you are becoming ridiculous.
>
>
> ----- Original Message ----- From: "Joe Subich, W4TV" <lists at subich.com>
> To: "Carl" <km1h at jeremy.mv.com>; <amps at contesting.com>
> Sent: Thursday, November 07, 2013 11:19 AM
> Subject: Re: [Amps] Looking for picture of SB220 interlock switch
>
>
>>
>> On 11/7/2013 10:47 AM, Carl wrote:
>> > Adding a roll cage into your Prius might also save your life.
>>
>> Yes, and putting a body around motorcycles would save thousands
>> of injuries/deaths a year.  I'm not about to strip the body off
>> my automobile and drive it on the interstate.  Saving a few
>> minutes in changing spark lugs isn't worth the danger every day.
>>
>> Since you remove the crowbar from amplifiers you service, do you
>> also remove the cover plates from your outlets/switch boxes and
>> disconnect the green wire?   After all, those are only necessary
>> if those using the house don't have enough personal responsibility
>> to keep their fingers out of the boxes or maintain their electric
>> powered equipment.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 11/7/2013 10:47 AM, Carl wrote:
>>> Adding a roll cage into your Prius might also save your life.
>>>
>>> However many of us come from the concept of personal responsibility, a
>>> bit of training, and the ability to read a warning label.
>>>
>>> Those that dont/cant are removed from the gene pool which may be a good
>>> thing.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- From: "Joe Subich, W4TV" <lists at subich.com>
>>> To: <amps at contesting.com>
>>> Sent: Wednesday, November 06, 2013 11:20 PM
>>> Subject: Re: [Amps] Looking for picture of SB220 interlock switch
>>>
>>>
>>>>
>>>> > That "safety" device can easily destroy your PS and I always
>>>> > disable/remove them and add a warning label.
>>>>
>>>> While it may destroy your power supply it can save your life.  The
>>>> best solution is to *add* the primary interlock switches and leave
>>>> the crowbar in place.  Disconnecting the primary before or at the
>>>> same time as shorting the HV will protect the power supply -
>>>> particularly if a properly sized glitch resistor has been installed
>>>> in the HV lead between the HV terminal and the crowbar/cold end of
>>>> the plate choke.
>>>>
>>>> Every one of the "big transmitters" I ever worked on had *both*
>>>> primary interlocks *and* mechanical crowbars in addition to the
>>>> "deadman stick" to be used before reaching into any place where
>>>> high voltage could exist.  Some of those power supplies were capable
>>>> of as much as 20 KV at 10A - they were nothing to take lightly.
>>>>
>>>> I would never disable a safety circuit - that is quick route to an
>>>> early appearance in "Silent Keys."
>>>>
>>>> 73,
>>>>
>>>>    ... Joe, W4TV
>>>>
>>>>
>>>> On 11/6/2013 11:00 AM, Carl wrote:
>>>>> That "safety" device can easily destroy your PS and I always
>>>>> disable/remove them and add a warning label.
>>>>>
>>>>> If you are that worried about safety then add a cover switch to
>>>>> disable
>>>>> the AC line as many other amps do.  Very simple and inexpensive.
>>>>>
>>>>> Carl
>>>>> KM1H
>>>>>
>>>>>
>>>>> ----- Original Message ----- From: "Geert Jan de Groot"
>>>>> <pe1hzg at xs4all.nl>
>>>>> To: <amps at contesting.com>
>>>>> Sent: Wednesday, November 06, 2013 4:07 AM
>>>>> Subject: [Amps] Looking for picture of SB220 interlock switch
>>>>>
>>>>>
>>>>>>
>>>>>> I'm preparing to start on an SB220 renovation project:
>>>>>> replace capacitors, update diode board, etc
>>>>>>
>>>>>> The previous owner has disbled the safely interlock by
>>>>>> bending the brass strip away and removing the
>>>>>> "tapped phenolic spacer". I'd like to restore them.
>>>>>>
>>>>>> I'm not sure what, and why, the machanical and electrical
>>>>>> parameters are of the spacer as I'll need to find something else.
>>>>>> I'd expected it to be a metal thing but according to the manual
>>>>>> it isn't.
>>>>>>
>>>>>> Does someone have a detailed picture of the interlock in place?
>>>>>> Why is it an isolator? What are the mechanical stresses on the
>>>>>> spacer?
>>>>>>
>>>>>> 73,
>>>>>>
>>>>>> Geert Jan
>>>>>>
>>>>>> PS: I know the interlock doesn't make it safe, but 'safer'
>>>>>> and that's still a good thing IMHO
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Amps mailing list
>>>>>> Amps at contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>>
>>>>>>
>>>>>> -----
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>>>>>> Version: 10.0.1432 / Virus Database: 3222/6313 - Release Date:
>>>>>> 11/06/13
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>> _______________________________________________
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>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
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>>>
>>>
>>
>>
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