SB 221 problem

[Jan Sluchak]

Hello to the group,
Just aquired another SB 221.  It appears to have Rich Measures mods in
it.  It also appears to have no grid current when idling and no drive.
I add drive, the unit does not produce any output, but the lights on the
meters glow brighter as I dial up drive, so I dial it down very
quickly.  Upon intial inspection all looks OK.  I suspect the zener
diode. How does one test a zener?  Any intial thoughts on what to check?

Thanks for any thoughts.
Jan N6YV

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html