>
>Ed, Jay, Phil, Paul & others:
>
>I took a look at the info on their site. It concerns me, having a good
>bit of experience with 4CX250B's in VHF amps, that the statement of 50
>watts of drive produces 600 watts out. For a KW DC input the 600 watts
>is about right. However, a well designed pair of 4CX250B's will drive
>into class C with 5 watts of drive.
My pair of 4cx250Rs in AB1 needed 10w of drive.
> Are they swamping the other 45
>watts? At 50 watts the grids will most likely go up in vapor. Least
>alone the IM produced before the big bang. With today's HF tranceivers,
>most are comfortable at 100 watts output, from where does this 50 watt
>number arrive?
To drive a pair of 250Bs in AB1 with a c. 100w HF transceiver, one
typically uses a 4:1 bifilar stepdown transformer with a 12.5 ohm grid
termination,
>
>Sure they build a good looking amp, but 2 pieces? Also, I have concern
>that 2 blowers (fans), producing 32 CFM thus more than twice the
>manufactures CFM is adequate. Oh sure that's the blower ratings. While
>Eimac says the 4CX250B needs 5.7CFM at a pressure of .7 inches of water
>at sea level, I wonder how they account for back pressure, other losses,
>in ducts and filters.
Measure specific pressure at the socket with a manometer and the other
losses matter not. // In my opinion, fans do not develop enough
pressure drop across the typical anode cooler. High pressure blowers are
way better. -- Kooltronic manufactures a high pressure blower that
should be able to handle the 4cx800A air requirement. The model
designation is KBB38. With 50HZ line freq., the KBB38 will deliver 60cfm
at 1.1"SP. With 60HZ, the delivery is 1.7"SP at 60cfm. For higher
pressure applications, Kooltronics makes a line of Radial Wheel Blowers.
The telephone number is 1-800-321-5665. See http://www.kooltronic.com.
cheers\
>I don't mean to poo poo their amp, it's design or price, but I do have
>concern regarding their intended market. It sure doesn't fit the
>typical "ham" operation as far as amps and drive vs output go.
>
>73
>Bob K4TAX
>(see my call on QRZ.Com for a "real" 4CX250B amp some 30+ years ago)
>
>
>Jay Musikar wrote:
>>
>> Ed -
>> I'm not sure as to what your comment means or
>> insinuates. However, the owner and designer of the
>> new amp and tuner is:
>> 1. An engineer
>> 2. An Amateur Extra Class and has been an Amateur for
>> more than 25 years.
>> 3. Strives for perfection
>> 4. Has a high standards.
>>
>> 73,
>> Jay/AF2C
>>
>> --- Edward Pagaduan <ezed@aloha.net> wrote:
>> >
>> > I wonder if companies such as this one, have a
>> > licensed experienced ham on
>> > staff for the legal operation of this equipment.
>> >
>> > 73 & Aloha,
>> > Ed
>> >
>> > ----- Original Message -----
>> > From: Phil Clements <philk5pc@tyler.net>
>> > To: Phil Levin W2GE <w2ge@arrl.net>; Paul
>> > Christensen <paulc@mediaone.net>;
>> > <amps@contesting.com>
>> > Sent: Monday, June 12, 2000 3:54 PM
>> > Subject: Re: [AMPS] New Amplifier Manufacturer
>> >
>> >
>> > >
>> > > I got a chuckle out of the philosophy of this "new
>> > kid on the block!"
>> > > They feel that the difference between their amp
>> > and a legal-limit amp
>> > > is hardly noticeable at the other end. I feel the
>> > same way...that the
>> > difference
>> > > between their amp and a Yaesu FT-1000D is hardly
>> > noticeable on the other
>> > > end! To say that they are adamant about no 10
>> > meter coverage is an
>> > > understatement. I don't think the competition will
>> > loose any sleep over
>> > > this "new kid!"
>> > >
>> > > (((73)))
>> > > Phil, K5PC
>> > >
>> > >
>> > >
>> > > >Subject: Re: [AMPS] New Amplifier Manufacturer
>> > >
>> > >
>> > > >
>> > > > Paul,
>> > > >
>> > > > They've been advertising for awhile now but I
>> > haven't seen any changes
>> > to
>> > > > there website in the last three or four months.
>> > I did receive an email
>> > from
>> > > > them about their pricing and it seemed
>> > reasonable, if I remember abt
>> > 1300
>> > > > for their H.F. amp. Only 800 watts though and
>> > they seem very adamant
>> > about
>> > > > no 10 meter operation. I've been interested in
>> > their six meter amp. but
>> > > > haven't seen any new news about it.... de Phil
>> > W2GE
>> > > >
>> > > > Subject: [AMPS] New Amplifier Manufacturer
>> > > >
>> > > >
>> > > > >
>> > > > > Check out the following link:
>> > > > >
>> > > > > http://www.cticomtec.com/index.html
>> > > > >
>> > > > > A new company, located in northeast Florida is
>> > producing a new line of
>> > > > > amplifiers that take on many attributes of the
>> > classic amplifiers of
>> > the
>> > > > > '50s and '60s era. K-logic is used
>> > extensively for control and both
>> > > > > internal/external components and indicators
>> > appear to be derived from
>> > > > > military electronics.
>> > > > >
>> > > > > Their product line includes a 4CX250-based
>> > H.F. amp with outboard
>> > P.S., a
>> > > > > high-power ATU, and a new 6-meter amplifier.
>> > Anyone know anything
>> > else
>> > > > > about them? Did they make an appearance at
>> > Dayton this year?
>> > > > >
>> > > > > -Paul, W9AC
>> > >
>> > >
>> > >
>> > >
>> > > --
>> > > FAQ on WWW:
>> > http://www.contesting.com/FAQ/amps
>> > > Submissions: amps@contesting.com
>> > > Administrative requests:
>> > amps-REQUEST@contesting.com
>> > > Problems:
>> > owner-amps@contesting.com
>> > >
>> >
>> >
>> > --
>> > FAQ on WWW:
>> > http://www.contesting.com/FAQ/amps
>> > Submissions: amps@contesting.com
>> > Administrative requests:
>> > amps-REQUEST@contesting.com
>> > Problems: owner-amps@contesting.com
>> >
>>
>> __________________________________________________
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>> Send instant messages with Yahoo! Messenger.
>> http://im.yahoo.com/
>>
>> --
>> FAQ on WWW: http://www.contesting.com/FAQ/amps
>> Submissions: amps@contesting.com
>> Administrative requests: amps-REQUEST@contesting.com
>> Problems: owner-amps@contesting.com
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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