420: Difference between revisions

Revision as of 00:18, 24 August 2023

Tektronix 420
high-voltage power supply 420 internal view Produced from to (?) Manuals Manual needed, please add (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 420 is a high-voltage power supply used in the Type 507 and Type 517 scope. It contains the transformers, rectifier tubes and filter capacitors in a separate enclosure with ceramic output feed-through posts.

Key Specifications

please add

Output voltages are +20 kV and –4 kV. Later models add +13.3 kV and +6.6 kV output taps.

Internals

The 420 contains two transformers, one for the high voltage, and a second for the HV rectifier heaters. The HV rectifiers are five 1X2 tubes, one for the negative and four in a Cockroft-Walton multiplier for the positive outputs.

The transformers are driven by independent oscillators using tubes located on the mainframe chassis, a 6AU5 for HV and a 6AQ5 for heaters. In the 517, the HV oscillator runs off an unregulated supply through its own DC series regulator with no feedback path from the HV side, only the oscillator input voltage is regulated. The 507 HV oscillator, supplied from the regulated +225 V rail, takes feedback from the negative HV output..

Pictures

Entry in 1950 Catalog
Schematic of 420 in the Type 517
later model 420 (with 13 and 6 kV outputs) in a 517
opening power supply type 420A, five 1X2 high voltage rectifier tubes
opening power supply type 420A, many capacitors

Some Parts Used in the 420

Part	Part Number(s)	Class	Description	Used in
1X2	154-0005-00	Vacuum Tube (Diode)	high-voltage rectifier	420 • 507 • 565

@@ Line 1: / Line 1: @@
-The '''Tektronix 420''' is a high-voltage power supply used in the [[507|Type 507]] and [[517|Type 517]] scope.
+{{Instrument Sidebar
-It uses [[1X2]] tubes as HV rectifiers.
+|manufacturer=Tektronix
+|model=420
+|class=power supply
+|summary=high-voltage power supply
+|image=420A_1.JPG
+|caption=420 internal view
+|series=96000-series scopes
+|introduced=
+|discontinued=(?)
+|manuals=
+* ''Manual needed, please add'' [[Category:Manual needed]]
+}}
+The '''Tektronix 420''' is a high-voltage power supply used in the [[507|Type 507]] and [[517|Type 517]] scope.  It contains the transformers, rectifier tubes and filter capacitors in a separate enclosure with ceramic output feed-through posts.
+{{MissingSpecs}}
+Output voltages are +20 kV and –4 kV.  Later models add +13.3 kV and +6.6 kV output taps.
+==Internals==
+The 420 contains two transformers, one for the high voltage, and a second for the HV rectifier heaters.
+The HV rectifiers are five [[1X2]] tubes, one for the negative and four in a Cockroft-Walton multiplier for the positive outputs.
+The transformers are driven by independent oscillators using tubes located on the mainframe chassis, a [[6AU5]] for HV and a [[6AQ5]] for heaters.
+In the 517, the HV oscillator runs off an unregulated supply through its own DC series regulator with no feedback path from the HV side, only the oscillator input voltage is regulated.
+The 507 HV oscillator, supplied from the regulated +225 V rail, takes feedback from the negative HV output..
+==Pictures==
 <gallery>
 Tek 420 hvps.png|Entry in 1950 Catalog
 Tek_517_hvps2.png|Schematic of 420 in the Type 517
+Tek 517 420 hv.jpg | later model 420 (with 13 and 6 kV outputs) in a [[517]]
 A_1.JPG| opening power supply  type 420A, five [[1X2]] high voltage rectifier tubes
 A_2.JPG| opening power supply  type 420A, many capacitors