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549/Repairs: Difference between revisions
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* Noted: R862 getting hot | * Noted: R862 getting hot | ||
* Root cause: Cathode choke (L862) hairline fracture of magnet wire | * Root cause: Cathode choke (L862) hairline fracture of magnet wire | ||
===Vertical amplificatio absent=== | |||
No vertical amplification Caused by v514 side delay line short circuit. In the drawing you can see the resistive values measured without the transistors for the working model and for the non-working one. In the photo you can also see how the delay line has been replaced, being impossible to find it on the market. Surely the calibration will have to be done again but the instrument is usable | |||
<gallery> | |||
Tek 549 connection side v514.jpg | Connection side v514 | |||
Tek 549 connections side L554 553.jpg | Connections side L554 553 | |||
Tek 549 temporary connections.jpg | Temporary/Provisional connections | |||
Tek 549 draft.jpeg | Schematics | |||
</gallery> | |||
[[Category:Instrument repair reports]] | [[Category:Instrument repair reports]] | ||