>
>
>>
>> My favourite tube. My question is this, how many times can you rebuild
>> 8171s before they are tired and worn. Never having to do this i always
>> wonder about the value of people like Econco. I have a good supply of
>> these tubes myself so have never had need to rebuild one. I have a few
>> that are shot as well mainly using them for door stops.
>>
>
>Econco have repeatedly stated the 8171 and similar tubes could be rebuilt
>essentially forever since the anode can be removed without loss of metal.
>In those tubes which require cutting the ceramic-metal seal the limit is
>the care with which the seal is cut and amount of material that is lost.
? The metal/ceramic bond is silver-solder. The anode can be unsoldered
as easily as it is soldered.
>Once too much material is lost (two, three or four generations in most
>tubes) the tube is unrebuildable due to the cahnge in parameters.
>
>With the 8171, I suspect a good "pull" will last a lifetime with, at
>most, one rebuild in amateur service as long as the amplifier is built
>with suitable regulation and safety circuits.
>
>73,
> ... Joe Subich, W8IK/4 ex-AD8I
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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