Hitachi Jackhammer Component

Here the component on the right, after jackhammering the potting stuff:

sorry on the left, the triac like "tingum"

If necessary, it can probably be run at full voltage,bypassing the speed control..an external speed control could be used for speed regulation (Autotransformer?).

I have some old cross reference books, Ill have a look-see for the component.

HiTek

Ok, a quick search reveals that what you have is probably a TRIAC,25AMP rms,with a to220 CASE, manufactured by STM Electronics.

Here is a link to a data sheet.Manufacturers always add extra letters and numbers to a basic device number to designate type of case,temperature rating,and manufactured date, among other things.To the uninitiated,this is a confusion factor.Even when familiar with the format,they are always changing the specific meaning of certain suffixes,so the best I can do is give you a generic part that probably will work.Remember, you have a TO 220 Case configuration.

http://pdf1.alldatasheet.com/datasheet-pdf/view/22072/STMICROELECTRONICS/BTB25-600CW.html

HiTekRedNek

Another thought:To more easily remove the epoxy potting, use freeze mist to freeze the epoxy first, then use a spring punch to shatter it.This might enable you to see the rest of the circuitry.If electronic freeze mist is not available, use the wart remover freeze mist,available at pharmacies.

These 2 wonderful hints are worth a good answer. Do you think liquid R12 can do the job too? And do those triacs have all the same the same PIN assignments? Tks

R12 will probably work.The pin layout is usually the same.

HiTeK