Manufacturer: General Radio Company (USA)
Model: 1109-A, S#206
Vintage: 1951
Purpose: Comparison Oscilloscope
Condition: Working
Comments:
This is possibly the only "oscilloscope" General Radio built, all others were called "oscillograph".
It was part of the General Radio 1105-A Frequency Measurement Equipment. Its purpose was to indicate frequency matching. The CRT is a 3DP1 with a center pin. This kind of scope was also called O-scope or Synchroscope. The displayed Lissajous figure indicates frequency matching and phase shift. This unit is still working, one short test and it will never see power again.
This is another example of top quality components and expert manufacturing.
Model: 1109-A, S#206
Vintage: 1951
Purpose: Comparison Oscilloscope
Condition: Working
Comments:
This is possibly the only "oscilloscope" General Radio built, all others were called "oscillograph".
It was part of the General Radio 1105-A Frequency Measurement Equipment. Its purpose was to indicate frequency matching. The CRT is a 3DP1 with a center pin. This kind of scope was also called O-scope or Synchroscope. The displayed Lissajous figure indicates frequency matching and phase shift. This unit is still working, one short test and it will never see power again.
This is another example of top quality components and expert manufacturing.
Documentation:
| general_radio_1109_manual.pdf |