<<.... or a pair of 8877s ... (which has been done, I think by W6RU)>>
...and about 10,000 other hams (give or take)!!!
Sincerely,
Dr. William J. Schmidt, II K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC
Email: bill@wjschmidt.com
WebPage: www.wjschmidt.com
"If computers get too powerful, we can organize them into a committee; that
will do them in." -- Bradley's Bromide
----- Original Message -----
From: "R.Measures" <r@somis.org>
To: "k7rdx" <k7rdx@earthlink.net>
Cc: "Joe Isabella" <n3ji@yahoo.com>; <amps@contesting.com>
Sent: Wednesday, August 10, 2005 12:18 AM
Subject: Re: [Amps] RF Parts OEM 3-500ZG's
>
> On Aug 9, 2005, at 5:31 PM, k7rdx wrote:
>
>> I was impressed the first 3KA I worked on by the sheer size of the
>> tank circuit components as well as the input network layout.
>
> The weak sister in the 3K-A is cooling. The el cheapo blower does not
> produce enough air pressure to keep the red paint on the tubes from
> charring to brown. Also, the solder in the tube pins #s 1 and 5 tends
> to melt and run out during a contest. Other problems are: lack of a
> glitch-R in the +HV, use of high-Q VHF parasitic suppressors and weak
> 3-500Z socket springs - which exacerbates the solder melting problem. .
>
>> The thing that really looks out of place is the 3-500z tubes...It
>> seems to me 3cx3000a7 would look right at home in there, or a pair of
>> 3cx1200A7s
>
> .... or a pair of 8877s ... (which has been done, I think by W6RU)
>
>
>> Bet you wouldn`t flat top those tubes in the old Henry..Jim.
>> ----- Original Message -----
>> From: Joe Isabella
>> To: k7rdx ; Gudguyham@aol.com ; amps@contesting.com
>> Sent: Tuesday, August 09, 2005 9:59 AM
>> Subject: Re: [Amps] RF Parts OEM 3-500ZG's
>>
>>
>> Remember, the 3K-A was designed as a commercial/government use amp.
>> It has no standby switch, and is built pretty stout (weighs nearly
>> 200lbs.). I'm about to take mine down to give it a good cleaning, add
>> 160m to it, and add some relays so I can remotely control the fils,
>> blower, and put it in standby when not needed. I've seen RFP 3-500ZGs
>> do nearly 2500W out in another Henry amp that was modified -- I'm sure
>> it was pretty dirty at those levels, but hey, who cares during a
>> contest, right??
>>
>> And like I said before, if you think 3-500s aren't good for 1kW PEP,
>> tell Ameritron...
>>
>> :-D
>>
>> Joe, N3JI
>>
>>
>> k7rdx <k7rdx@earthlink.net> wrote:
>> Some of the older Henry 3k amps had current limiting in the psu
>> negative and
>> required 100+ watts drive for just 1200 or so output (Easily
>> disabled).2K
>> output(Very possible) from a Henry equipped with 3-500z tubes
>> seems a bit
>> excessive to me,especially if your`e concerned about keeping
>> neighbors and
>> fellow hams happy..Jim.
>> ----- Original Message -----
>> From:
>> To: ;
>> Sent: Monday, August 08, 2005 7:58 PM
>> Subject: Re: [Amps] RF Parts OEM 3-500ZG's
>>
>>
>>>
>>> In a message dated 8/8/2005 11:56:52 A.M. Eastern Standard Time,
>>> n3ji@yahoo.com writes:
>>>
>>> Maybe you should try it with **TWO** 3-500ZGs, like my Henry runs. It
>> will
>>> provide nearly 4kV at 1A with Peter Dahl upgrades.
>>>
>>> Joe, N3JI
>>>
>>>
>>>
>>>
>>> I wont comment on the first sentence, but the 4KV would probably have
>>> to
>> be
>>> under load. Most amps except for your Henry WONT give 4KV under load.
>> Any
>>> other amp except one like yours will not produce that kind of power
>>> from
>> 3-500s
>>> _______________________________________________
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>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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>>
>>
>>
>> -----------------------------------------------------------------------
>> -------
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>>
>>
>
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
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