Letting the tube run constantly at minimum intensity (low/no grid current)
does prevent burn-in, but it contributes to cathode poisoning. HP warns
against doing that in their manuals, and gives you a way to turn the whole
CRT supply including the filament on and off via those shift-G/H keys.
Aluminized phosphors may or may not have anything to do with burn-in
resistance; I don't know. I've seen plenty of HP and Tek CRTs with severe
burn-in, though.
-- john, KE5FX
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-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]On Behalf Of arthurok
Sent: Wednesday, January 17, 2007 5:54 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: HP8568B CRT replacement question
LCD?
you think that the crt beam is wearing out the phosphor? "ion
burns???
i thought aluminized tubes were immune to ion burns?
i have found that tek crts last allot longer then hp ones
----- Original Message -----
From: John Miles
To: hp_agilent_equipment@...
Sent: Wednesday, January 17, 2007 7:41 PM
Subject: RE: [hp_agilent_equipment] Re: HP8568B CRT replacement question
LCD?
>Alternately, consider what it costs to have these instruments repaired
>for business use. We have several (4 at last count) 8566B where I work,
>and the minimum repair cost is a flat $3,500. The CRTs are still OK on
>those because we have consistently been able to enforce the rule of
>turning brightness down when not in use
Don't do that -- make 'em hit shift-G/shift-H!
-- john, KE5FX
