The first PCBs designed at Tektronix were used in the 310 oscilloscope introduced in 1955.  There were two double sided paper phenolic PCBs - one for the Y amplifier and one for the high voltage.  There were some issues so the 310A, introduced in 1959, reverted back to ceramic strips.

Components were mounted on both the top and bottom of the PCB.  The museum is fortunate to have a bare 310 PCB and design files.  The PCBs were fabricated 4 up.

The 4X artwork is not tape but rather filled ink.  Note the top (tube side) artwork is labeled bottom and are both dated after the introduction of the 310.  GSR on the artwork likely refers to George S. Roussos.

This composite image shows the two layers superimposed.

The drill chart is dated August 21, 1956 and shows the bottom view.

This schematic shows the PCB schematic.

This image from the service manual shows the components mounted on both sides.

The 310 also had a high voltage PCB.  More photos of a 310 with PCBs can be found on the Richard Sears Vintage Electronics page.

We have a Tektronix Printed Circuit Boards 1969 video on our Video Gallery.