[Test-Equipment] Advice about used scopes

[Mike Manes]

My company scrapped a 7000 (250 MHz version) after about 5 years of
daily service after the cal lab required us to replace the CRT for
this symptom - at a price of over $1200!  That's the extent of my
experience, but it stuck with me!

73 de Mike W5VSI

Greg Werstiuk wrote:
> I haven't run into anyone noting this previously.  Compared to others here
> who have been exposed to more 7000 series hardware, I'm not in a position to
> say you are incorrect.
> 
> However, I wonder if this was incorrectly extrapolated by someone from
> comments about the 1GHz bandwidth 7104, a very different beast than the
> balance of the 7000 series scopes and one in which I understand the CRT is
> sensitive, worked hard and relatively easily damaged.
> 
> 
> 
> - Greg
> 
>> -----Original Message-----
>> From: test-equipment-bounces at mailman.qth.net 
>> [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of 
>> Mike Manes
>> Sent: Friday, May 04, 2007 4:56 PM
>> To: Chris Albertson
>> Cc: test-equipment at mailman.qth.net
>> Subject: Re: [Test-Equipment] Advice about used scopes
>>
>> I've been told that the CRT is a popular failure in the 7000 series.
>> But it can be tested for remaining life simply by advancing 
>> the brightness control slowly to max.  If the trace 
>> brightness tops out and then gets dimmer, the CRT's on its last legs.
>>
>> 73 de Mike W5VSI
>>
> 
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-- 
Mike Manes    manes at attglobal.net     Tel: 303-979-4899
"Things should be made as simple as possible, but not more so."  A. Einstein