But be prepared for very substantial blower & air noise, such that many
people may not tolerate it, right?
73, Dick
----- Original Message -----
From: "measures" <2@vc.net>
To: <RMcGraw@blomand.net>; "Jay Musikar" <af2c@yahoo.com>
Cc: "Edward Pagaduan" <ezed@aloha.net>; "Phil Clements"
<philk5pc@tyler.net>; "Phil Levin W2GE" <w2ge@arrl.net>; "Paul Christensen"
<paulc@mediaone.net>; "AMPS" <amps@contesting.com>
Sent: Saturday, June 17, 2000 5:43 AM
Subject: Re: [AMPS] New Amplifier Manufacturer
>
> >
> >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
> >> >
> >>
> >> __________________________________________________
> >> Do You Yahoo!?
> >> 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
>
>
> --
> 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
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Administrative requests: amps-REQUEST@contesting.com
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