🚀 go-pugleaf

On Thu, 25 Jun 2009 13:17:58 -0700, Joerg <invalid@invalid.invalid>
wrote:

>John Larkin wrote:
>> On Thu, 25 Jun 2009 19:50:09 GMT, Rich Grise <richgrise@example.net>
>> wrote:
>> 
>>> On Wed, 24 Jun 2009 22:01:51 -0700, John Larkin wrote:
>>>> On Wed, 24 Jun 2009 21:42:07 -0700, <castlebravo242@att.net> wrote:
>>>>> "David L. Jones" <altzone@gmail.com> wrote in message 
>>>>> news:h8B0m.53620$FI5.3564@newsfe12.iad...
>>>>>> Check out a rather unusual phenomenon you can see on your oscilloscope in 
>>>>>> my latest blog (#14):
>>>>>> http://www.alternatezone.com/eevblog/
>>>>>> See if you can get it to happen on your scope!
>>>>>> I'll offer a free subscription to my blog for the best screen shot posted 
>>>>>> :->
>>>>>>
>>>>>> Oh, and the probe doesn't have to be shorted either.
>>>>> When I worked a Century Data we had a problem with our new reel to reel 
>>>>> vaccuum column tape drive when ever someone would walk by the drive when it 
>>>>> was reading it would get data errors. The problem was that the shield on the 
>>>>> cable from the heads to the preamp was grounded on both ends.
>>>> That's usually the best way to ground shields.
>>> When I was a kid, my brother built a Heathkit TOOB amp; in the low level
>>> circuits, they only ever grounded one end of the shields.
>>>
>> 
>> Inside a steel chassis pan, it wouldn't matter. But then Heathkit was
>> hardly an authority on signal management.
>> 
>
>Now wait a minute, they engineered darn good stuff. The old HW100/101 
>transceivers were among the best ever made back in the tube days. Still 
>got one. No noises or buzzes whatsoever and its performance in the 
>vicinity of strong signals is stellar. The only not so good thing was 
>the two rubber pulleys because they cooked out too fast, but you could 
>keep a stash of them in the drawer.

Toob amps didn't rectify RF as well as silicon does.

John