A nice little project for someone to refurbish this Textronix TDS420 Scope. It is in nice cosmetic condition but does not power. Has all the looks of a PSU fault so hopefully a relatively simple repair.

So sold as parts/not working.

Collection only on this one.

Specs are:

Bandwidth: 150 Mhz Channels: 4

The TDS420 Digital Storage Oscilloscope features 150 MHz bandwidth, 100 MS/s sampling rate on 4 channels, 4 digitizers, a sensitivity of 1 mV to 10 V/div (with calibrated fine adjust) and 25 automatic measurements.

Signal Acquisition System

Bandwidth - 150 MHz
Channels - 4
Digitizers - 4
Sample Rate - 100 MS/s on all channels
Sensitivity - 1 mV to 10 V/div
Position Range - 5 Divisions
Vertical Resolution - 8-bits (256 levels over 10.24 vertical divisions).
Analog Bandwidth Selections - 20 MHz, 100 MHz, and full.
Input Coupling - AC, DC, or GND
Input Impedance Selections - 1 M ohm in parallel with 15 pF, or 50 ohms (AC and DC coupling).
Maximum Input Voltage - 400 V (DC + peak AC).
Acquisition Modes

Peak Detect
Sample
Envelope
Average
Hi-Res
Time Base System

Time Bases - Main, Delayed
Time/Division Range - 1 ns to 20 s/div
Record Length (real time and equivalent time) - Sample points per channel: 500 to 15,0000, Opt. 1M offers 60,000 points.
Pre-Trigger Position - Selectable from 0 to 100% of record.
Triggering System

Triggers - Main, Delayed.
Main Trigger Modes - Auto, Normal, Single Sequence.
Delayed Trigger - Delayed by time or events.
Time Delay Range - 0 ns to 20 s.
Events Delay Range - 2 to 10,000,000 events.
Video Trigger Types - NTSC, PAL, SECAM, and Custom; TV Field, field 2 or both. Option 05 includes a Video Clamp Pod.