Bob,
I would check for final amp tube. We have 2 of these amps at our club
station and have seen the tube go south in just this manner, tripping the
breaker first and then comming back to life before it finally quits witha
dead short internally.
73,
Dave, K2DP
----- Original Message -----
From: <K8MLM@aol.com>
To: <amps@contesting.com>
Cc: <K8MLM@aol.com>
Sent: Sunday, December 28, 2008 4:29 PM
Subject: [Amps] HENRA 4K-ULTRA HELP
> The other day I heard a poof in the Henry 4K-U and it tripped the mains
> circuit breaker. I opened it up and looked for something burned or smoke
> smell
> and found nothing. Then fired it up for test.
>
> Other than the Grid Current idling high (about 40 ma in low power setting
> /
> 70 ma in high power setting) when the amplifier is keyed in SSB with no
> modulation, everything else operated same including power out. On the
> air checks
> also seemed normal.
>
> In the low power setting if I consider the idling 40 ma point the zero
> position it operated and reads normal grid current, e.g., it reads 40 ma
> at idle
> with no modulation. When modulating SSB it rises an additional 30 ma grid
> (40
> ma + 30 ma rise = 70 ma).
>
> This leads me to believe something in the grid meter circuit has gone
> out.
> Before I open the top and check the grid current metering adjustment per
> the
> manual (page 12 para 5.5) and trace the circuit, I wonder if anyone has
> had a
> similar problem.
>
> Thanks in advance for your help.
>
> Bob
>
> K8MLM
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