I agree. The 3-500 is about the only one to meet those requirements. I
would even go with 3 of them in parallel to allow for high duty cycles
like RTTY.
Conduction and/or water cooled tubes will break your bank account!
Mike, W1NR
On 01/28/2015 11:12 AM, Larry wrote:
> AS far as I know, there is only one tube(s) that meet your requirements;
> a pair of 3-500Zs.
>
> If you drop the "instant-on" requirement, there are quite a few other
> possibilities.
>
> One other possibility if you can handle it might be 2X or 3X triode
> connected 4-400As. I've not been able to reliably get 1500 out on all
> the HF bands with a pair, but three in parallel makes it easy. See my
> web page for a 3 x 4-400A 40 meter monobander.
>
> 73,
>
> Larry - W7IUV / WH2XGP
>
>
> On 28-Jan-15 6:00 AM, Manfred Mornhinweg wrote:
>> A question to all those of you who have used many different tubes:
>>
>> What tube(s) would you recommend for a legal limit HF amplifier, to get
>> as close as possible to the following goals:
>>
>> - Class AB2 operation at high efficiency, low idling power, at
>> acceptable IMD (doesn't need to be brilliant).
>>
>> - Ideally grounded grid triode, but a tetrode with screen supply is
>> acceptable if a GG triode won't do it.
>>
>> - Instant-on filament, or at least quick heating (no more than 10
>> seconds).
>>
>> - Easy cooling requirements, so that a low noise fan or blower can be
>> used. Maybe conduction cooled or water cooled.
>>
>> - Available and reasonably priced.
>>
>> I know I'm asking to much, but I would like to analize the best options
>> out there!
>>
>> Manfred
>>
>> ========================
>> Visit my hobby homepage!
>> http://ludens.cl
>> ========================
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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
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