[Boatanchors] Tube shields

[Brian Carling]

Lol

Thanks for that berry useful information!

Best regards - Bry Carling



> On May 25, 2014, at 8:12 PM, "Michael" <k3mxo.hi at gmail.com> wrote:
> 
> Note that the only good ones are the IERC shields made to MIL-S-9372 specs.
> Of those, only the ones which were made on alternate Tuesdays that coincide
> with a new moon between the hours of 7:14 AM and 1:23 PM are worth having.
> The others made to this spec resonate imperceptibly at frequencies between
> 516 Hz and 2.16 kHz.  This resonance is impossible to see on any test
> equipment.  Only a true expert's ear can hear it.  Other IERC shields also
> have resonance issues, mostly at negative frequencies which cancel out the
> positive counterparts in music thus leaving the music sounding hollow and
> unfulfilled.  Non-IERC shields sound metallic and aren't worth the metal
> they're made from.
> 
> Best Regards,
> 
> Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  
> What was the greatest thing before sliced bread?
> http://www.nationalmssociety.org/chapters/NTH/index.aspx
> http://wh7hg.blogspot.com/
> http://kludges-other-blog.blogspot.com
> Hiki Nô! 
> 
> -----Original Message-----
> From: Boatanchors [mailto:boatanchors-bounces at puck.nether.net] On Behalf Of
> Brian Carling
> Sent: Sunday, 25 May, 2014 13:44
> To: Bob Jackson
> Cc: porch.boat; puck.boat; qth.boat
> Subject: Re: [Boatanchors] Tube shields
> 
> I have a bunch of the black ones if anybody is interested...
> 
> Best regards - Bry Carling
> 
> 
> 
>> On May 25, 2014, at 6:48 PM, "Bob Jackson" <bob145 at suddenlink.net> wrote:
>> 
>> I always assumed that tube shields were used to keep stray RF either in or
> out of the tube or both. Are there other reasons as well like keeping them
> securely in their sockets via the little springs inside the shield?
>> 
>> Bob
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