Quote:
Originally Posted by cathoderay57
Yep, the diode worked a treat. The meter now swings over to max at switch-on, but only just max, and isn't hard against the stop. After about 15 seconds the valve starts conducting and the meter drops to zero. An adequate fix. I'm still not convinced the FET circuit hyperlinked in post #23 would work properly as-drawn since it permanently limits the AGE line to -0.6v. Jerry
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Now that I think about it - my HA350 did the same on switch on. Another owner also reported the same. The full scale deflection wasn't really alarming - the over voltage wasn't too drastic, apparently.
It looks as if the manufacturers were aware of this, but didn't think it merited some extra components!
The diode across the meter is definitely a good idea though.