Vactorol

[drog_trog]

Any ideas on this 4 pin vactorol, think it says VTL JA2

[somnif]

I know vactech is the company that came up with the term "Vactrol" back in the late 60s, so I'd wager thats a seriously old school representative. Can't find much on the specifics of that part though.

edit: Could be a "VTL-9A2", based on an incandescent lamp. PDF is a bit blurry but would suggest an off resistance of 10meg, on resistance of ...60 ohms? That seems off, but again, hard to read data sheet.

http://datasheet.datasheetarchive.com/originals/distributors/Datasheets-111/DSAP0026836.pdf

[matmosphere]

Neat, if he is correct and it is incandesscent then it should probably get hot while it's  operational. 

I experemented with 3mm incandescent lights instead of leds and gave up on it cause they got way to hot.

[drog_trog]

Must be VTL9A2 then