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Re: [TowerTalk] Yaesu - 2700 and 3800 rotors

To: Dale Martin <kg5u@hal-pc.org>, towertalk@contesting.com
Subject: Re: [TowerTalk] Yaesu - 2700 and 3800 rotors
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 5 Nov 2007 18:51:25 +0100 (CET)
List-post: <mailto:towertalk@contesting.com>
Dale said:
>I can only say I've replaced more incandescents (>10)
than LED's (0) due to simple burn out in the equipment. <

The  incandescents I've replaced in the last 20 years were ones run without 
surge protection in Yaesu equipment, and some in a boatanchor receiver that I 
was restoring that hadn't failed but had evaporated a fair amount of filament 
onto the glass. Theyw ere only 45 years old.  In my home brew equipment, no 
failures in that time. Now this may well be because I use series resistors and 
so minimise the switch on current surge, as well as purposely under-running the 
bulbs by about 10%. In the same period, I've had 3 tube failures (one of them 
was WW2 5R4GY!) and some 17 transistor/IC failures.
Of course, not all semiconductor 'failures' are. Many years ago now, a customer 
returned 6 brand new ICs from a batch which he said, all failed. The failure 
was 'no function, logic levels wrong'. However, the device in question was an 
analogue AM/SSB detector chip....... and they worked perfectly to the correct 
test spec in the correct test fixture. 
73
Peter G3RZP
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