1-02-01 13.11, skrev measures på 2@vc.net följande:
>
>>
>> Hi Jason,
>>
>>> I just looked at RF Parts. They have a matched pair of 3-500ZG
>>> (3-500ZG RFP) for about $255. I think that they are Svetlana tubes.
>>
>> As far as I know, Svetlana never made and production 3-500Z
>> tubes. As I recall they re-labelled some Chinese tubes,
>> accidentally stamping "made in USSR" on them.
>>
> chortle
>> .....
>> You will have multiple problems trying to substantially increase the
>> output of an L4B, not just power supply issues. If you did NOT have
>> multiple problems, then obviously Drake did not engineer the PA
>> well and they wasted money on things that were needlessly large.
>>
> Amen to that, Mr. Rauch.
>
>
> - Rich..., 805.386.3734, www.vcnet.com/measures.
> end
>
>
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>
Swedish State Dept love this overrated L4B linear used for more than 35
years in many Swedish embassies . Gives more reliability than many other
underrated ham linears. They ran it on RTTY for hours with 600 watts out.
Normal anode voltage is 2500 volts and normal pep input is 2000 watts. Gives
you 1100 -1200 watts out on SSB. The power supply gets hot however and
transformers and blower are made for 60 cy not the 50 cy we have in Europe.
This is often the case with US made linears made for the majority of 60 cy
US customers not for the smaller number of 50 cy customers in the rest of
the world.
Transformer losses increase when you run a 60 cy on 50cy. Does not he blower
run at reduced speed as well? Reduced cooling as well?
The best L4 was the first L4 without the B thad had EIMAC SK sockets and
chimney. Great.
I recommmend to read what Bill W6SAI had to say in the May 1991 issue of CQ
magazine about cooling of the 3-500Zs. You find it in the Technical Topics
Scrapbook 1990 -94 by Pat Hawker G3VA. Published by the RSGB. Rich and Peter
articles are there too.
Prosit de Hans SM5KI
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