Lavoie LA-265A
The Lavoie LA-265A is a 33MHz 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.
Electrical difference to 545
The high-voltage circuit is 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.
Mechanically difference to 545
The 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.
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Lavoie LA265A with Lavoie LA-265CA Plugin
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Terminals with tin-plated steel insert
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Schematic of HV-Supply, glow stabilizer
