Author Topic: Harbinger 1.5 Bulb pulsating momentarily  (Read 155 times)

Axeman

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Harbinger 1.5 Bulb pulsating momentarily
« on: November 10, 2019, 10:01:07 PM »
So I finished My Harbinger 1.5 today when I powered it up 9V the bulb pulsated for about 3 seconds and the light remained steady.  so I disconnected the power and tried it again, and same thing pulsates then stops. ??????
Any help

Axeman

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Re: Harbinger 1.5 Bulb pulsating momentarily
« Reply #1 on: November 11, 2019, 04:33:40 PM »
OK got it working Q11 and Q12 (MPSA13) replaced.  The way I figured it out was by shorting the ground on Q11.  Hope that helps someone else.