[MSA-Talk] Follow up on old Phillips generator

[Henry Barwood]

Wanted to let everyone know how my attempts to fix my old XRG 2000-2500 XRD turned out. Here are the suggested fixes for the high Ma on start-up:

 

Suggested: Gassy tube. Changed tube with no change in the high Ma

Suggested: Bad 2D21 vacuum tube in the Ma stabilizer. Replaced with a new one. No change in the high Ma

Suggested: Bad 67.5 V battery. Replaced with a fresh one. No change in the high Ma

 

In addition to these, I checked all the connections for the filament transformer box, and checked the rheostats in the Ma control just to make certain something wasn’t shorted/wired incorrectly. No faults found and same results on start-up: High Ma

I hope to have schematics for a variable transformer replacement for the whole Ma stabilizer before too long and will see if I can replace the stabilizer with this unit.

When I start the unit, the KV comes on at 10KV and the Ma at 30. If I turn the voltage up, the Ma will go up to around 35 at 30KV. If anyone has any suggestions for anything else I might try, please let me know. All previous units I’ve had came on at 10KV and around 5-8 Ma

Henry

-- 
Henry Barwood
Professor, Earth Science
Department of Chemistry and Physics
Troy University
Troy, Alabama 36082