[Amps] SB200 on 6m & my take

[Carl]

You are so clueless.

The Svetlana isnt even a close clone to the Cetron or real Taylor. Its 
quite different internally.

The Svetlana says absolutely nothing about derating for 6M but if you 
can read the specs you will see that the 2750V ICAS rating has been 
derated to about 76% when run at the ~ 2100V of the SB-200. However the 
Svetlana is better suited to audio use as its even troublesome on 
10-15M.


The current Taylor is a generic Chinese tube that you pay extra for the 
nice paint job.

Neither one even has hardened glass as do the originals.

Please learn a bit about the subject before posting rumors and erroneous 
info that might confuse forum members that are truly interested in 
learning things.

Carl
KM1H


----- Original Message ----- 
From: "KB0NLY" <kb0nly at mchsi.com>
To: "Carl" <km1h at jeremy.mv.com>; <amps at contesting.com>
Sent: Friday, March 13, 2009 1:27 PM
Subject: Re: [Amps] SB200 on 6m & my take


> Svetlana, Taylor, you name it.  Just go download them and look for 
> yourself.
>
> Scott
>
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "KB0NLY" <kb0nly at mchsi.com>; "David Craig" 
> <davidhcraig at verizon.net>; <amps at contesting.com>
> Sent: Friday, March 13, 2009 11:44 AM
> Subject: Re: [Amps] SB200 on 6m & my take
>
>
>> What spec sheets from what manufacturers?
>>
>> Please cite actual examples.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- 
>> From: "KB0NLY" <kb0nly at mchsi.com>
>> To: "Carl" <km1h at jeremy.mv.com>; "David Craig"
>> <davidhcraig at verizon.net>; <amps at contesting.com>
>> Sent: Friday, March 13, 2009 11:36 AM
>> Subject: Re: [Amps] SB200 on 6m & my take
>>
>>
>>> Since all the spec sheets from all the manufacturers said so.  They
>>> hardly hold their own at 10m.
>>>
>>> 73,
>>>
>>> Scott
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Carl" <km1h at jeremy.mv.com>
>>> To: "David Craig" <davidhcraig at verizon.net>; <amps at contesting.com>
>>> Sent: Friday, March 13, 2009 8:45 AM
>>> Subject: Re: [Amps] SB200 on 6m & my take
>>>
>>>
>>>> I'll be briefer. Since when isnt the 572B rated to 6M?
>>>>
>>>> Carl
>>>> KM1H
>>>>
>>>>
>>>> ----- Original Message ----- 
>>>> From: "David Craig" <davidhcraig at verizon.net>
>>>> To: <amps at contesting.com>
>>>> Sent: Friday, March 13, 2009 12:44 AM
>>>> Subject: [Amps] SB200 on 6m & my take
>>>>
>>>>
>>>>>    Brief & to the point- they stink, monoband or (worse) tapped
>>>>> bandswitch "models".  They may be fine for the occassional SSB QSO
>>>>> without pushing it, but otherwise they do one thing with 
>>>>> regularity-
>>>>> they die/burn out/self-destruct.  RTTY? WSJT & other digicrap with
>>>>> 100% duty cycle for 30-55 seconds key-down?  Result?  Be ready for 
>>>>> a
>>>>> buzz, hiss, POP & Boom & to buy a new amp, or parts that cost 
>>>>> enough
>>>>> $
>>>>> to build a new one.  I don't do any digital myself save cw but if
>>>>> you
>>>>> want a list of dead SB200 conversions (owned by others) I'll be
>>>>> happy
>>>>> to provide them, some were EME deaths & others that just "crapped
>>>>> out"
>>>>> due to tubes that aren't ment to be used at that QRG.
>>>>>    I don't care what you can "get away with", I want something 
>>>>> that
>>>>> isn't going to crap out because the tubes aren't rated for 50MHz
>>>>> use.
>>>>> SB200s should be left to HF.  If you are still going to convert 
>>>>> one,
>>>>> do what I am doing and put a 3CPX800 in it with new cooling and a
>>>>> new
>>>>> FWB PS and appropriate transformer.  Otherwise build one with an
>>>>> appropriate tube/s from scratch which I have also done x 3.  572Bs
>>>>> are
>>>>> a lousy tube for 6m conversion unless your habit is to run it a 
>>>>> few
>>>>> hours per year.
>>>>>    Oh, one last thing- for parasitic suppressors, don't be lazy 
>>>>> and
>>>>> use the resistor leads as a soldering surface for the L (really a
>>>>> "U")
>>>>> between resistor sides on a 6m conversion.  I have seen 4 cases so
>>>>> far
>>>>> of that method resulting in heat melting the "L" on the 
>>>>> plate-block
>>>>> side... ergo all B+ plus RF current passes thru the resistors &
>>>>> softens the tubes in seconds. $600+ $ down the tubes.
>>>>>
>>>>>    N3DB
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
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