[Heathkit] Heathkit Digest, Vol 97, Issue 15

[William Houghton]

Hi David,

Here are the reasons I can think of for why you don't get a dot on the screen:

1- No heater. Either you have no heater voltage or the heater is open.
2 - CRT is biased in cutoff. Check the intensity control & the focus.
3 - No high voltage. 
4- Spot is deflected off screen (I don't recall if you can manually move it so 
far off you don't see it.
5 - Emissions on the CRT are gone. Highly unlikely if you had a good spot and 
after "awhile" you have nothing. 


If you have the sweep switch in the "int" position you should get a trace 
instead of a dot. I find the trace more useful during troubleshooting.

73,

Bill, WA6NEQ



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Subject: Heathkit Digest, Vol 97, Issue 15

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Today's Topics:

  1. Testing CRT's (David C. Hallam)
  2. Re: Testing CRT's (Pat Swayne)


----------------------------------------------------------------------

Message: 1
Date: Mon, 20 Feb 2012 12:04:17 -0500
From: "David C. Hallam" <dhallam at knology.net>
Subject: [Heathkit] Testing CRT's
To: Heathkit <heathkit at mailman.qth.net>
Message-ID: <4F427D11.8080805 at knology.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Is there some way to test CRT's?  I have a SB-610 that I am trying to 
get working.  I replaced paper and electrolytic capacitors, and a bunch 
of resistors.  When I first turned it on I had a spot on the screen.  I 
left it for a little while and when I came back the spot was gone.  I 
have gone through the voltages and don't see anything that is way out of 
whack.  I will admit that my HP 410C is not properly calibrated on the 
HV range so all I can say about the voltages over 1000V is that they are 
present and probably within a 100 volts or so of what they should be.

David
KW4DH

-- 
There are four boxes to use in defense of Liberty:
SOAP, BALLOT, JURY AND AMMO. Please use in that order.
VOTE for REAL CHANGE in 2012.



------------------------------

Message: 2
Date: Mon, 20 Feb 2012 17:52:34 -0500
From: Pat Swayne <me at patswayne.com>
Subject: Re: [Heathkit] Testing CRT's
To: dhallam at knology.net
Cc: Heathkit <heathkit at mailman.qth.net>
Message-ID: <4F42CEB2.2020501 at patswayne.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Heathkit used to make a CRT tester/rejuvenator. They actually worked 
quite well for both purposes. I still have one -- somewhere.
-- Pat (former Heath employee)

On 2/20/2012 12:04 PM, David C. Hallam wrote:
> Is there some way to test CRT's?  I have a SB-610 that I am trying to
> get working.  I replaced paper and electrolytic capacitors, and a bunch
> of resistors.  When I first turned it on I had a spot on the screen.  I
> left it for a little while and when I came back the spot was gone.  I
> have gone through the voltages and don't see anything that is way out of
> whack.  I will admit that my HP 410C is not properly calibrated on the
> HV range so all I can say about the voltages over 1000V is that they are
> present and probably within a 100 volts or so of what they should be.
>
> David
> KW4DH
>
>    



------------------------------

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End of Heathkit Digest, Vol 97, Issue 15
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