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Tektronix TM504
four-bay mainframe
Tektronix TM504

Produced from 1975 to (?)

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix TM504 is a four-bay mainframe for the TM500 system. The rightmost compartment can supply a high-powered plug-in.

The TM504A is functionally identical, with the addition of a fan in the rear panel, and relocation of the power switch to the centre underside of the front panel. It was exclusively supplied as part of the F7523A1 MOD WQ Test Set, part number TS-4353-U, containing modules SG505 Mod WQ, SG505 Mod WR and AA501A Mod WQ.

Key Specifications

Plug-in Supplies
  • +33.5 V and −33.5 V, 1.4 A max shared by all compartments

Low Power Compartments:

  • 2 × 25 VAC, 0.5 A / 25 VA; floating ≤350 V (peak) per compartment
  • +11.5 V, and 17.5 VAC with grounded centre tap, 3.6 A max shared between all three low power compartments

High Power Compartment:

  • 2 × 25 VAC, 1 A / 50 VA; floating ≤350 V (peak)
  • +11.5 V, and 17.5 VAC with grounded centre tap, 4 A max shared between these two supplies
Power 100/110/120/200/220/240 V, 48 Hz to 440 Hz, max. 220 W
Weight 18.5 lbs (8.4 Kg)
Size 9.5" (24.1 cm) H, 12" (30.5 cm) W, 20" (50.8 cm) L

Option 2

TM504 Option 2 adds internal pin headers for each slot as well as rear 50-pin and BNC connectors, allowing for custom wiring to, from and between plugins.


Documents Referencing TM504

Document Class Title Authors Year Links
Tekscope 1975 V7 N3.pdf Article A Potpourri of Modifications and Service Hints 1975


The pass transistors on the low-power compartments are MJE2901 (151-0373-00, PNP) / MJE2801 (151-0349-00, NPN) − 60 V, 10 A, hfE 25 - 100. The high-power compartment has MJ2955 (151-0258-00, PNP) / 2N6258 (151-0413-00, NPN), on later serial numbers replaced with 151-0140-00, a selected 2N3055.