[Heathkit] Heathkit Digest, Vol 97, Issue 16
Richard V.S. Lawrence
van334 at hotmail.com
Thu Feb 23 08:56:06 EST 2012
Testing
Be sure to look at the scope in a darkened room. Faint hints of where the beam is landing can often be seen this way.
Sent from my iPhone
On Feb 22, 2012, at 11:07 AM, heathkit-request at mailman.qth.net wrote:
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> Today's Topics:
>
> 1. Re: Heathkit Digest, Vol 97, Issue 15 (William Houghton)
> 2. Testing CRT's (W. Harris)
> 3. HV Test Set (Walter Treftz)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Feb 2012 09:49:07 -0800 (PST)
> From: William Houghton <rdrbill at pacbell.net>
> Subject: Re: [Heathkit] Heathkit Digest, Vol 97, Issue 15
> To: heathkit at mailman.qth.net
> Message-ID: <1329846547.2463.YahooMailRC at web83504.mail.sp1.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> 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
>
>
>
> ________________________________
> From: "heathkit-request at mailman.qth.net" <heathkit-request at mailman.qth.net>
> To: heathkit at mailman.qth.net
> Sent: Tue, February 21, 2012 9:03:00 AM
> Subject: Heathkit Digest, Vol 97, Issue 15
>
> Send Heathkit mailing list submissions to
> ??? heathkit at mailman.qth.net
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> ??? http://mailman.qth.net/mailman/listinfo/heathkit
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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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>
> ------------------------------
>
> Message: 2
> Date: Tue, 21 Feb 2012 18:28:12 +0000
> From: "W. Harris" <nbcblue at hotmail.com>
> Subject: [Heathkit] Testing CRT's
> To: Heathkit Reflector <heathkit at mailman.qth.net>
> Message-ID: <SNT115-W418762E34DB5878373F7E3BE670 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> If you had just a spot, then the sweep circuit isn't working and by leaving the spot on for any amount of time it burned the phosper on the screen and that is why it disappeared.
> Change the sweep generator tube V3, keep the intensity turned all the way down and only turn it up for a brief moment to check for operation. A scope would help make troubleshooting easier.
>
> Bill - K5MIL
> http://radioremembered.org
>
>> 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
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 21 Feb 2012 12:33:25 -0800 (PST)
> From: Walter Treftz <sjotrollet at yahoo.com>
> Subject: [Heathkit] HV Test Set
> To: "Heathkit at mailman.qth.net" <Heathkit at mailman.qth.net>
> Message-ID:
> <1329856405.31086.YahooMailNeo at web125805.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> If anyone is interested in a HV test instrument (good for CRT testing) there is one available
> in an estate we are helping with for $25 plus postage. It works OK. If interested, can send
> pix and full description on request.
> 73
> Walt (N4GL)
>
> ------------------------------
>
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> End of Heathkit Digest, Vol 97, Issue 16
> ****************************************
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