On Sun, Dec 9, 2018 at 04:17 AM, Gary Robert Bosworth wrote:
This is a tough one. I have a Tek Plug-In number 7B80. It is mod GB. I see no
mention of this modification in the manuals.
It should be quite obvious if compared to an unmodified 7B80.
This is what the mod manual insert says:
//
7B80
MOD GB
This manual insert describes MOD GB as it applies to the Tektronix Time Base
plug-in unit. MOD GB increases X2 the horizontal preamplifier gain to extend
the top sweep rate to 5 ns/div and to 0.5 ns/div, magnified. Rates slower
than 10 us/div have been deleted, limiting the TIME/DIV switch to 11 positions
and the front-panel HOLDOFF control has been deleted, and internal circuits
wired to provide minimum holdoff for all ranges.
//
/H?kan
zenith5106