Lavoie LA-265A: Difference between revisions

Revision as of 08:21, 18 November 2018

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33 MHz oscilloscope Lavoie LA265A with Lavoie LA-265-CA Plug-in Produced from (?) to (?) Manuals Lavoie LA-265-A Manual (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Lavoie LA-265A is a 33 MHz scope that takes letter-series and 1-series plug-ins. It is an unauthorized clone of a Tektronix 545A made for a defense contract by Lavoie Laboratories.

It has two timebases, which allows delayed triggering.

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.

Links

LA-265A, a superb Tek clone (radiomuseum.org forum)
radiomuseum.org page for LA-265A

Pictures

Lavoie LA265A with Lavoie LA-265-CA Plug-in
Lavoie LA-265-CA Plug-in
Ceramic terminals with tin-plated steel insert
Schematic of HV-Supply, glow stabilizer
Lavoie LA-265A with Tektronix Type B
Lavoie LA-265A with Tektronix Type B
Lavoie LA-265A with Tektronix Type B
Lavoie LA-265A with Tektronix Type B
Black front LA-265A
Side view
Rear view

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