581: Difference between revisions

581 (view source)

222 bytes added , 24 August 2013

no edit summary

32,957

edits

@@ Line 1: / Line 1: @@
 The Tektronix 581 is similar to the [[585]], but with simplified trigger and sweep circuitry.
 It was [[introduced in 1959]].
-The vertical signal path of the 581 is the same as that of the 585.  It uses the [[T581]] CRT.  There is also a 581A, which
+The vertical signal path of the 581 is the same as that of the 585.
-has [[tunnel diodes|tunnel diode]] triggering. 581A has bandwith 85Mhz instead of 100Mhz, because CRT-production has bad yield. Many CRT provide not reach 100 Mhz.
+It uses the [[T581]] CRT.
+Type 581 scopes with serial numbers up to 510 use an all-tube trigger cicrcuit.
+Starting at serial number 511, the 581 uses [[tunnel diodes|tunnel diode]] triggering.
+A Type 581A was introduced later, and it is specified to have a bandwidth of 85MHz instead of 100MHz.
+The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope
+was specified to 100MHz.
 * [http://w140.com/tek_581_sn1273.pdf Tektronix 581 Manual (PDF)]