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Re: 7704A - Grid Bias

 

Hi Raymond,

When you asked that question in that post, I was thinking you were wanting to make sure that I knew that those control affect the brightness. I was unaware, though, that those should be set quite the way they should be. I have been relying on the Service Manual for documentation but I see now that the Operator's Manual is very important as well and have downloaded that. Hopefully that will reduce the number of "operator error" questions I have going forward.

I'm still not seeing, though, in the Operator's Manual (Manual #070-1402-00) where it states how to properly set the individual intensity controls to properly display a highlighted trace. The section titled "Intensity Controls" on path 1-9 discusses those controls but in a somewhat generic fashion. Perhaps I'm overlooking something.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Raymond Domp Frank" <hewpatek@...>
To: "tekscopes" <[email protected]>
Sent: Friday, November 19, 2021 2:48:39 PM
Subject: Re: [TekScopes] 7704A - Grid Bias
On Fri, Nov 19, 2021 at 09:19 PM, n4buq wrote:


I tested your suggested setup and it does indeed have a positive effect. With
a 7B53A in the B slot and set up to display a delayed trace, if I turn the B
INTENSITY pot fully CW and then adjust the main INTENSITY control to see the
trace without any observable highlighting. I can then rotate the B INTENSITY
pot slowly CCW, I can start seeing the dual intensities and the highlighted
one is not excessively bright. I can then make slight adjustments to both pots
to where a clean, dual-intensity trace is displayed.

Is this the way the two INTENSITY controls should be used? I have been setting
the A/B INTENSITY pots such that with the main INTENSITY pot at about 12:00 to
1:00 o'clock, the "basic" trace is visible and it was then if I elected to
display a highlighted, delayed trace, I would see the excessively bright part
of the trace. Perhaps this is merely operator error?
If this is confirmed, it does look like operator error, doesn't it, as I
suggested in my message #188002 on November 14th? It's not two completely
independent controls, so perhaps a bit counterintuitive.

Raymond
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