TM502A

Tektronix TM502A
dual-bay mainframe Tektronix TM502A Produced from 1988 to (?) Manuals Tektronix TM502A Manual 070-6502-00 Tektronix TM502A Manual 070-6502-01 (Manuals are OCRed PDF files unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix TM502A is a dual-bay mainframe for the TM500 system.

Key Specifications

Line Voltage	100 V, 120 V, 220 V, 240 V ±10%
Line Frequency	48 Hz to 440 Hz
Max Power	90 W
Weight	4.0 kg (8.75 lbs)
Size	14.0 cm × 14.5 cm × 40.7 cm (H×W×L) (5.5" × 5.7" × 16.6")
Plugin Supply	+33.5 V / −33.5 V, 350 mA max ea. +11.5 V, 1.3 A max, shared with 17.5 VAC winding. 17.5 V_AC with grounded center tap, 30 VA max 2 × 25 V_AC, 2 x 0.5 A / 25 VA (combined) max; floating ≤350 V (peak) 35 W DC or 75 VA Maximum plug-in power draw from mainframe. <75 VA + 2.1 W DC Combined power draw sharing limitation.

Links

Repair and Test a Tektronix TM502A Mainframe by NFM @ YouTube
TM500 and TM5000 pass transistors

Prices

TM502A
Year	Catalog price	In 2026 dollars
1990	$295	~$730
1994	$395	~$900

Info

The mains input jack can be easily broken if the unit is dropped on its end with the power cable plugged in. A compatible replacement is Schaffner part number 4303.1093, and the matching Voltage Selector Fuse Drawer is Schaffner part number 4303.2014.01