Lavoie LA-265A

The Lavoie Laboratories LA-265A is a 33 MHz scope that takes letter-series and 1-series plug-ins.

It has two timebases, which allows delayed triggering. It is a military cloned Tektronix 545A.

Internals

Electrical difference to 545

The high-voltage circuit is not identical to that of the Tektronix 545A. Glow lamps are used to stabilize the high voltage in brightness circuit. However, the glow lamp stabilizer is often faulty. The lamps aged too fast, with the result that the trace flickers.

Mechanical difference to 545

The mains transformer is potted. Unlike Tektronix instruments of the same era, which require silver-bearing solder, ordinary solder is fine for working on the Lavoie. This is because the terminal strips in the Lavoie have tin-plated steel inserts.