Tek 561 and 3A1 Fixed Finally

Just thought I'd let you know, it is finally done. I had help too. Anyway :

Wired in substitute transformer for filament of CRT.

Replace Q 260 and modify to accept silicon.

Replace Q 233 & 243, silicon worked fine.

Bypassed variable vertical gain controls.

Cleaned output level switch and tub socket on calibrator.

Basic calibration of sweep and vertical gain.

Sounds easy eh ? It took some doing to figure it out and the modification for Q 260 was all wrong at first because I am not that familiar with working in a negative supply. But someone pointed out my mistake and one piece of quick math it was good to go.

Anyway, between "A Little Help From My Friends" here, on SER and the Tek Scopes group it is working pretty much perfectly. It might need a bit more calibration but I need to obtain a couple of things first. It is however, plenty usable right now.

Reply to
jurb6006
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The 561 is a beast of a scope from before my time, like the brontosaurus it's hard to believe they stalked the earth regularly at one point

Reply to
bitrex

The 560-series scopes ran hot and weren't very reliable. They were sort of ugly, too.

The 547 was a work of art. Some of the plugins, like the differential amps and comparators, did things that are really hard to do now.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics
Reply to
John Larkin

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