>
>
> Somehow I wish more people would run tubes like 4CX5000 or
> 4CX10000 or similar, think we would have less splatter and
> cleaner/nicer sounding signals on the band.
? In Class A, IMD is probably below 50db down. In AB1, they are still
cleaner than most radios. For perfectionists, there are the ultralinear
"J" versions.
> These days we have rigs with very big power spikes that flat
> tops the amplifiers and also people that drives the crap out of
> their 1500 W amps to make them deliver a puny 350 Watts more.
? Good points, Jan E.. Does 0.91 db (1850w vs. 1500w, <1/6 S-unit)
more output really make a difference on HF when QSB is running around 3
S-units?. Some folks on AMPS have argued that it does. I am not
convinced.
cheers
>
> PS: I have one brand new 4CX10000 and one brand new 4CX15000 for
> sale, anyone interested?
>------------------------------------------------------------------------
>----------------------------------------
>
>-----Ursprungligt meddelande-----
>Från: measures@vc.net [SMTP:measures@vc.net]
>Skickat: den 9 juli 1999 04:52
>Till: amps@contesting.com
>Ämne: VB: RE: [AMPS] 4cx10000
>
>
>
>
>>
>>
>>>
>>> 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...
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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