HP 3312A
Data sheet
http://www.testequipmentdepot.com/usedequipment/pdf/3312A0.pdf
Service manual
https://ese.wustl.edu/undergraduate/Documents/lab_support/HP_3312A_Function_Generator.pdf
https://literature.cdn.keysight.com/litweb/pdf/03312-90004.pdf?id=734381
Repairs and more :
HP 3312A Strange DC offset issue
HP3312A. The main generator output (Vp-p) and Sync output give no waveforms at all
Problem with HP 3312A Function generator
Replacing an HP/Agilent 3312A P-channel JFET
TEST EQUIPMENT PR0N: THE HP 3312A