[Amps] Failed 8877

[Rich]

>On Tuesday 08 October 2002 09:31, Michael J. Tubby B.Sc. \(Hons\) G8TIC 
>wrote:
>
>>
>> Steve,
>>
>> Aren't these the tubes that when you invert them you hear a 'plink' type
>> noise from inside as they disconnect?
>I just dug them out - I can't hear the tinkling noises that I remember from
>before and one of them is going open when inverted. I never tried to
>correlate the noise to heater continuity - at the time I heard the noise, I
>think I wasn't aware of the heater problem.
>
New ones sometimes make noise when shaken.