[Boatanchors] Electronic T/R Switch

Carl km1h at jeremy.mv.com
Wed Nov 5 14:01:58 EST 2008


Many decades ago there were suggestions to use a small fan. These days 
it is even easier to implement.

Carl
KM1H


----- Original Message ----- 
From: <w8au at sssnet.com>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, November 05, 2008 11:46 AM
Subject: Re: [Boatanchors] Electronic T/R Switch


> At 10:49 AM 11/5/2008, Kenneth D. Grimm, K4XL replied:
>>Carl wrote:
>>>Thats like saying all motorcycles have 2 wheels so they must perform 
>>>the same!
>>>The 2 tubes arent even close in specs. Johnson used some engineering 
>>>smarts and the ARRL was just being the ARRL.
>>
>>Yep, your're right!  The Johnson TR switch, in addition to switching, 
>>was designed to fry bacon...or your hand, if you were careless.  That 
>>puny little ARRL 12AU7 version would only keep your buns warm.  :-)
>
> AMEN to that, Ken!  I have had the Johnson TR switch hooked up at my 
> "happy days" setup
> for the last 40 years, and it will still give a good burn if touched. 
> I am surprised that
> it has remained intact all these years without burning up!  (I don't 
> think I will be
> figuring out the electric costs to generate that heat for 40 years.. I 
> don't need any
> more negative thoughts today) :-)
>
> w8au
> _______________________________________________
> 



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