SG504

The Tektronix SG504 is a levelled sinewave generator plug-in for the TM500 system.

Tektronix SG504
levelled sinewave generator Tektronix SG504 Produced from 1974 to 1993 Manuals Tektronix SG 504 Instruction Manual (PDF), 18MB (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Key Specifications

Frequency range	50 kHz or 6 MHz (Ref), 245 MHz to 550 MHz (Lo), 495 MHz to 1050 MHz (Hi)
Output amplitude	0.5 V_p-p to at least 4 V_p-p, flat to within ±4%
Monitor output	0.3 V_p-p into 50 Ω
FM input	±9 V into 50 kΩ (DC to 100 kHz) produces ±0.05% to ±0.4% deviation depending on frequency

Output Head

The SG504 is usually found on Ebay without the output head (015-0282-00). David Partridge did an excellent teardown and reverse engineering of the output head and sells kits to make new heads.

It's fairly easy to use that schematic to make a new level head that fits in a standard BNC Pomona box since its function is really just a 250 MHz to 1050 MHz temperature compensated power meter with 50 Ω feed-thru. See the pictures for an example.

As of April 2016, Ebay seller "ancelb" is selling SG504 leveling (output) heads that are specified to perform much better than the original Tektronix heads. See photo below.

There is an open source project to replace the output head at hackaday.io.

Pictures

With output head (catalog picture)
Home-made output head
Late Revision Front Panel with LED Frequency Readout
SG504 head being produced and sold on Ebay by seller "ancelb"
SG504 in TM515 with other TM500 gear