549: Difference between revisions

549 (view source)

Revision as of 06:12, 15 September 2020

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Kurt

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@@ Line 92: / Line 92: @@
 The 549 has a 65°C (150°F) [[thermal cutoff]].
-The 549 uses a [[120-0423-00]] HV transformer.
+The 549 uses a [[120-0423-00]] HV transformer driven by a [[6GF5]] tube from +470 V.
-==Repair issues==
-===C335===
-scopes from the Portland factory contain one black Areovox 0.5 µF / 400 V capacitor in the horizontal amplifier (in the middle of the upper chassis) which is often deteriorated (leaky). When this is the case, the trace is compressed on the right side.  To confirm, temporarily disconnect this capacitor and power on the scope with intensity control at CCW, and after initial warm-up of a minute increase the intensity to test if the problem disappears.
-This capacitor is part of the beam steering arrangement during power-up to avoid screen burn. −150 V power on pulse is coupled via this capacitor to the R/C340 network in V343A's grid to move the beam to the left and off the screen during initial power up.  The beam returns to screen after R/C340 discharges.
-The leaky capacitor can be replaced with a modern 0.47 µF / 630 V (or higher) capacitor.
-This problem does not appear to occur in Dutch-made 549s.
-<gallery>
-badtrace.jpg | compressing trace on right side
--areovox.png | Bad capacitor in horizontal amplifier schematic
-_badareovox.png  | Location of bad capacitor in horizontal amplifier
-Tek_549_C335.png | Location of bad capacitor in horizontal amplifier
-</gallery>
 ==Links==
-* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration]
+* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration] / [https://www.youtube.com/watch?v=8rWH-uuf60U Video]
 * [http://www.radiomuseum.org/forum/tektronix_the_storage_story.html Tektronix, the Storage Story]  (1966) @ radiomuseum.org
 * A [https://www.youtube.com/watch?v=1SRtm7eva0A 549 @ YouTube]
@@ Line 120: / Line 103: @@
 Tek-549 and d.jpg                | 549 front, earlier round bezel
 Tek 549 mt1.jpg                  | 549 front, later rectangular bezel
 Tek 549 trace2.jpg               |
+Tek_549-Front.jpeg               |
+Tek_549-Stroage-Ctrl.jpeg        | 549 Storage controls
 Tek 549 trace2..jpg              |
 Tek 549 trace.jpg                |
@@ Line 129: / Line 114: @@
 Tek 549 1a4 1.jpg                |
 Tek 549 1a4 2.jpg                |
+Tek_549-Rear.jpeg                | 549 Rear
+Tek_549-Line-Range.jpeg          | Line voltage selector
 Tek 549 1a4 3.jpg                |
 Tek 549 1a4 4.jpg                |
 _Delayed_Trace.jpg            | B INTEN BY A Trig in 549
 _Dual_Trace.jpg               | Dual trace display in 549
+Tek 549-1 knob layout.jpg|549 knob layout
 </gallery>
@@ Line 145: / Line 133: @@
 ===Internal===
 <gallery>
+Tek_549-LHS.jpeg                 | LHS
+Tek_549-RHS.jpeg                 | RHS
+Tek_549-RHS-Timebase.jpeg        | RHS Timebase Ch: Door Open
+Tek_549-Top.jpeg                 | Top
+Tek_549-Under.jpeg               | Underside
+Tek_549-V-Amp.jpeg               | 8608 vertical output tubes
 _vert_amp.jpg                 | Vertical amp
 _Vertical_OP.jpg              | 8608 vertical output tubes
 Tek 549 vertamp on.jpg           | 8608 vertical output tubes
+v out.jpg
 _top.jpg                      | Top view
 _storage_board.jpg            | Storage board
@@ Line 154: / Line 149: @@
 Wellenkino 549-7.jpg             |
 Wellenkino 549-6.jpg             |
+Tek_549-Prim-Sel-Sw.jpeg         | Primary voltage range selector
 _Tubes_ON1.jpg                | LV power supply tubes
 _Tubes_ON.jpg                 | LV power supply tubes

549: Difference between revisions

549 (view source)

Revision as of 06:12, 15 September 2020

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