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. Neon lamps are used to stabilize the high voltage in brightness circuit. However, the neon 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.
Manuals
Links
- LA-265A, a superb Tek clone (radiomuseum.org forum)
- radiomuseum.org page for LA-265A
Pictures
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Lavoie LA265A with Lavoie LA-265CA Plug-in
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Lavoie CA Plug-in
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Terminals with tin-plated steel insert
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Schematic of HV-Supply, glow stabilizer
