On Sep 17, 2005, at 6:01 PM, David Kirkby wrote:
> R.Measures wrote:
>> On Sep 17, 2005, at 1:50 PM, jon s wrote:
>>> I am relaying this for my Father (AI9U) who does not subscribe
>>>
>>> Last night he was back at his station after a 10 day period of
>>> non-use
>>>
>>> FT920/Alpha 87A/3 ele Steppir/40_80 Dipole
>>>
>>> With the Amplifier Off - but still in line he was using the tuner to
>>> match the dipole, when an "incredible bang" (his words) occured in
>>> the amplifier, tripping the 220V breaker. Upon reseting the
>>> breaker, the Alpha powered up but would not do much else
>>>
>>> Anyone ever have something like this happen?
>> Hello, Jon -- Around 40% of the owners I surveyed reported
>> inexplicable sudden events that required factory service to correct.
>> When Dick. WØID was a participant on AMPS. he told me he had seen
>> over 150 tubes at the Alpha factory that had gold-sputtering damage.
>> Perhaps one of the tubes has this malady. The Funderberg (W6IHA)
>> test for gold-sputtering is non-destructive and simple to perform -
>> provided one has a hi-pot tester. If you do not have a hi-pot, I
>> volunteer to test the tubes for you - gratis - in the interest of
>> amplifier science.
>
> If I understand the orginal poster correctly, the amp made the
> "incredible bang" when it was "Off". That I take as meaning the power
> switch was in the Off position.
>
> Perhaps I misunderstood the meaning of "Amplifier Off - but still in
> line he was using the tuner to match the dipole". But if the power was
> really "Off", there could have been no HT present.
When the standby switch is in the amp-off position, there's high-V
present.
>
> What "Off" means exactly needs some clarification.
agreed, David
...
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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