Regarding this, I've seen the term "double-peaking" used but am not finding examples of it.
If I increase the intensity too much in my 7704A, I start seeing a thickening of area around the trace (halo?) whereas lower intensity traces are sharp and without that effect. Is the fatter trace double-peaking?
Thanks,
Barry - N4BUQ
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----- Original Message -----
From: "K7XYM" <public2@...>
To: "tekscopes" <[email protected]>
Sent: Monday, March 21, 2022 12:30:12 AM
Subject: [TekScopes] 7904 - NOS CRT ?
So I know its a ludicrous question, but, I want to ask anyway. Are there any NOS
CRTs that ever come up for the 7904 ?
I am asking because I am in the middle of a _major_ restore to new, complete
with tons of mods to go beyond original performance, on my 7904 and I am now
aware that these CRT age and have issues with beam spot size not related to
electronics. I have 3 7904's and I have swapped electronics, as a whole,
between the chassis only one tube ends with with a super sharp spot size. The
other 2 are larger spot size and one has kinda odd behavior with brightness
adjustments. Again that is with swapping ALL the electronics. Its a tube thing.
So no hope of getting a NOS CRT for these right ?
I am going to refurb and mod 2 and I might have to just buy 7904's looking for a
good tube.
Anyone have any full parted 7904 chassis with just the tube ?
