Hi Raymond,
That was the easy part, the photo shows he was using a 7633 scope (lucky guy to own one of those) so it had to be a 7CT1N.
Slightly harder was verifying that the traces on the screen are what happens when you forget to switch the Gate and Drain leads on a 7CT1N.
For years I thought Tek made a mistake and they put the letters down that way in error. But eventually I discovered that by swapping the gate and drain connections it saved them from having to add a switch on an already tight front panel to reverse the polarity of the gate steps which is needed when you are testing a FET. On a 576 and 577 there is a push button switch that lets you reverse the polarity of the gate steps for testing JFETs.
Dennis Tillman W7PF
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-----Original Message-----
From: Raymond Domp Frank
Sent: Friday, November 02, 2018 10:43 AM
On Fri, Nov 2, 2018 at 06:37 PM, Dennis Tillman W7PF wrote:
Hi Dennis,
COMMON MISTAKE: Your photo shows you did not switch the Drain and the
Gate leads when you were using the 7CT1N. I believe when you do switch
them that you will see there is nothing wrong with the FET.
So a 7CT1N was used. Well done mr. Watson!
Raymond
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Dennis Tillman W7PF
TekScopes Moderator
