[Boatanchors] News story about risk of high altitude EMP

[Bry Carling]

Interesting point about the Transformers. Yes, I have seen this firsthand with a lightning strike not even close to my house taking out a transformer in a linear amplifier that was plugged into the AC mains during a lightning storm.

Transformers can be damaged by lightning strikes as much as 4 miles away from your shack. Unplug them!

Best regards - Brian Carling
AF4K Crystals Co.
117 Sterling Pine St.
Sanford, FL 32773

Tel: +USA 321-262-5471




> On May 2, 2015, at 8:36 AM, Michael Zolno <luv.myipad3 at me.com> wrote:
> 
> Yes and No.
> 
> My understanding of the problem is that the most susceptible items i.e. transformers, and there are a lot of them in tube gear, would fail the same way the power transformers in the mains distribution system due to the high induced voltages associated with EMP. We have enough of of time finding the correct transformers for restoration, and I know I don't have a stack of any of them (HV power, LV heater, various chokes, inter stage coupling types, audio, etc, etc, ad nauseam) stored safely away in a faraday cage t keep my tube gear on the air.
> 
> All my very best,
> 
> Mike WH6YH 
> 
> Sent from my iPad
> 
>> On May 2, 2015, at 1:46 AM, boatanchors-request at mailman.qth.net wrote:
>> 
>> That was an asinine thing to write.  Vacuum tube gear IS more resistant in 
>> general to EMP than is solid state.  And generally discrete circuits are 
>> more resistant than IC ones.  That part of the equation has absolutely nothing 
>> to do with the power grid.  An EMP would likely take out any HT made in the 
>> past 40 odd years, but not, for whatever good it would do anyone, sets like 
>> the BC-611 or AN/PRC-10.
>> 
>> Robert Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
> Message delivered to bcarling at cfl.rr.com
> 
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> 
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html