To the obsessive I agree and I fit that description on 160M and VHF and up.
However many dont get that involved and run 1" hardline, buy a hilltop,
erect big towers and antennas, etc, etc (-;
The 3-500 is rated to 110 mHz at full power and is a fine, efficient, 6M
tube. The 572B is actually rated to 54 or 60 "mc" in some old descriptions.
Ive yet to have a problem getting 40M performance on 6 with them.
Ive converted several 2 and 3 hole Alphas, its the tube cost that scares off
many, a 2 holer isnt any more output than a SB-220 if you want long life.
Id rather use a 2 3CX800 or a single 8877 and dont push it to 2500W unless
you are a nitwit with lots of money.
Carl
KM1H
----- Original Message -----
From: "Roger" <sub1@rogerhalstead.com>
Cc: <amps@contesting.com>
Sent: Wednesday, December 02, 2009 8:52 PM
Subject: Re: [Amps] Advice
>
>
> Carl wrote:
>> Is a 1-2dB increase worth it?
> "To me" chasing DX, working Aurora, or contests, every db counts.<:-))
> Although the 3-500's and 572Bs are considered poor tubes for VHF due to
> the long internal leads, they work quite well in a properly designed and
> constructed circuit.
>
> I'd think the old Alpha 76 series would make really good subjects for
> mods, but there many amps out there for less money that will suffice and
> "in general" it is far easier to modify an existing amp than build from
> scratch.
>
> 73
>
> Roger (K8RI)
>> The LK-450 is built rugged and is a good
>> platform. Since Ive converted over 200 SB-220's to 6M Ive got no
>> complaints
>> there but its easy availability is why it is so popular.
>>
>> Carl
>> KM1H
>>
>>
>>
>>
>> ----- Original Message -----
>> From: <Gudguyham@aol.com>
>> To: <n8de@thepoint.net>; <amps@contesting.com>
>> Sent: Wednesday, December 02, 2009 6:24 PM
>> Subject: Re: [Amps] Advice
>>
>>
>>
>>> Excellent advice Don, But an Sb-220 is superior!! Lou
>>>
>>>
>>> In a message dated 12/2/2009 10:48:06 A.M. Eastern Standard Time,
>>> n8de@thepoint.net writes:
>>>
>>> Save money and time.
>>> Sell the LK and buy a ready-made SB200 conversion from one of the
>>> experts who do that. W1QJ is one of those guys.
>>>
>>> Standard disclaimer .. good guy to do business with from a satisfied
>>> customer.
>>>
>>> Don
>>> N8DE
>>>
>>> p.s. I might buy the LK if you want to sell it.
>>>
>>>
>>> Quoting Phil LaMarche <plamarc1@verizon.net>:
>>>
>>>
>>>> I have an LK 450 Amp Supply amplifier with vacuum relays etc that I'm
>>>> considering the conversion to 6 meters. Want to hear from you if this
>>>> is
>>>> the way to go or should it be another model for conversion?
>>>>
>>>> Thanks,
>>>>
>>>> Phil
>>>>
>>>>
>>>> Philip LaMarche
>>>> LaMarche Enterprises, Inc.
>>>> <http://www.instantgourmetspices.com/> www.instantgourmetspices.com
>>>>
>>>> www.w9dvm.com <http://www.w9dvm.com/>
>>>> 800-395-7795 pin 02
>>>> 727-944-3226
>>>> FAX 727-937-8834
>>>> NASFT 30210
>>>>
>>>> K3 #1605
>>>>
>>>> CCA 98 00827
>>>> CRA 1701
>>>>
>>>> W9DVM
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>
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