I have a SB-200, with new Taylor 572B's I get a good 700 out. Running
on 220 volts.
I also have a AL-811H, with 4 Taylor 572b's and I get 800 and a bit
more on 220 volts.
Of course the Ameritron is NOT running any where near the proper plate
volts. So with 4 tubes I
get what a SB-200 does on 2.
Dan/W4NTI
ku8e at bellsouth.net wrote:
> Why not pickup something like an old Heathkit SB200. It will put out about
> 500 watts. I see them on eham.net all the time for as low as $250. I don't
> see that you could homebrew an amp for that cheap...
>
> Jeff
>
>
> ----- Original Message -----
> From: "Bill Coleman" <aa4lr at arrl.net>
> To: "JT Croteau" <jt.w6fo at gmail.com>
> Cc: "*SEDXC Group" <sedxc at contesting.com>
> Sent: Saturday, September 23, 2006 9:12 AM
> Subject: Re: [SEDXC] Homebrew Amps
>
>
>
>> On Sep 22, 2006, at 8:34 AM, JT Croteau wrote:
>>
>>
>>> Anyone have any schematics/plans/ideas for getting ~200W from either
>>> 5W or 50W drive without breaking the bank?
>>>
>> There's not a huge difference between 50 watts and 200 watts. That's
>> only a single S-unit.
>>
>>
>>> I have acquired a nice
>>> Ten-Tec Argosy that I am cleaning up and it will have a really low
>>> noise floor and improved dynamic range when I am finished. Some type
>>> of foot warmer would also be nice.
>>>
>> If 50 watts is not enough, consider finding a used older-generation
>> tube amplifier. Something like an SB-200 can be had for less than $500.
>>
>> Last year, I bought a used AL-80A from a ham's estate. I spent a bit
>> more than $500, but what the heck. It uses a single 3-500Z and with
>> 50 watts drive will produce about 500 watts or so.
>>
>>
>>> I know Tokyo Hy-Power has some commercial pre-built options in this
>>> range but I, and my wallet, would much rather homebrew if possible.
>>>
>> Homebrewing an amplifier can be done, but it isn't cheap. Key
>> components, like the HV transformer or tube(s), can easily run you
>> over that $500 budget, if you buy them new.
>>
>> Amplifier design and construction also requires a certain level of
>> care and expertise. The voltages can easily kill you. The energy
>> stored in the power supplies can be enough to explode components.
>> Proper component choice is necessary to avoid catastrophic failures.
>>
>> You're better off looking for a used amplifier. If you are totally
>> focused on homebrew, you should consider buying used amplifiers for
>> key parts.
>>
>> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr at arrl.net
>> Quote: "Not within a thousand years will man ever fly!"
>> -- Wilbur Wright, 1901
>>
>> _______________________________________________
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>> SEDXC at contesting.com
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>>
>>
>
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>
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