SV: [AMPS] feedback sought: Ameritron AL-80
Hans Goldschmidt
sm5ki@algonet.se
Sat, 30 Oct 1999 23:03:27 +0200
Thanks Dan, I was just reading from the EIMAC data sheet. Ask them why.
However,I got something similar from a SB 1000. If you can run a 8873 in IVS
why not a 3-500Z? Henry made several amplifiers using 8873s and 8874s in
IVS running up to 1000mA ( instead of max 700 mA for the pair ), remember?
250 dollars /pair is that original EIMAC?
Hej daa de Hans / SM5KI
----------
>Från: "Radiodan W7RF" <RFpower@radiodan.com>
>Till: "AMPS" <amps@contesting.com>
>Ämne: RE: [AMPS] feedback sought: Ameritron AL-80
>Datum: lör 30 okt 1999 21.03
>
>
>Hans, I'm sorry to say that you CANNOT get 850 or 890 watts out of a single
>3-500 tube.
>
>Rich sez so.................. (Rich did mention "at this anode supply
>voltage")
>
>Now, back to reality, 3500 VDC at 400 MA with 60% efficiency is 840 watts
>out. This is at only 60% with 3500 VDC and at rated current. Easy to see how
>guys can get 2000 watts from their pair in a HENRY 3K, 2K Classic X, etc.
>Still the best value in legal limit amateur transmitting tubes today at
>$250/pair.
>No need to argue this, it happens every day.
>
>
>73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
>Manufacturers Rep & Distributor for HENRY RF Power Amplifiers.
>RF Applications Power Measuring equipment, See the VFD & WinWatt!
>www.radiodan.com <http://www.radiodan.com> RFpower@radiodan.com
><mailto:RFpower@radiodan.com> A trip to our web site is worth the click!
>
>
>
>
>> -----Original Message-----
>> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
>> Behalf Of Hans Goldschmidt
>> Sent: Saturday, October 30, 1999 6:14 AM
>> To: measures; AMPS
>> Subject: SV: [AMPS] feedback sought: Ameritron AL-80
>>
>>
>>
>> Hej all:
>>
>> I have in front of me an EIMAC data sheet of the 3-500Z ( 6-1-77) and HAM
>> RADIO (1/77 ) - an article by W6SAI called "intermittent voice
>> operation " (
>> EIMAC publication AS 40 ) . The 3-500Z is said to deliver 890 watts of
>> useful watts ( does this include output circuitry losses?? ) at 3500
>> volts/400 mA and 40 dB 3rd order products. The 8873 ( inside same as 8875
>> and 8874 ), mentioned in the HAM RADIO article, has a 350 mA maximum anode
>> current. Still, EIMAC, in IVS service,allows 500 mA ( in short
>> tune ups and
>> SSB modulation peak current ) with still low 35 dB 3rd order distorsion
>> products. The 8874 family has been been pushed to this limit in
>> this IVS way
>> in many amplifiers by HENRY, HEATHKIT, ALPHA with little problems
>> in normal
>> use. I also have seen many amplifiers using 8873 and 8874 after many years
>> service still delivering almost full power with no harm and still almost
>> normal distorsion products. Even when using PEP in cw service. My
>> old HENRY
>> using a pair of 8873s, nowadays used by a guy in cw contests, still works
>> fine. It all depends on the operator, of course - the way he tunes up his
>> amplifier and using it. RTTY, FM and long tune-ups is of course
>> not possible
>> in this IVS service unless you have a thick wallet,hi!
>> Hej daa de Hans SM5KI
>> ----------
>> >Från: measures <measures@vcnet.com>
>> >Till: "AMPS" <amps@contesting.com>
>> >Ämne: Re: [AMPS] feedback sought: Ameritron AL-80
>> >Datum: lör 30 okt 1999 07.27
>> >
>>
>> >
>> >>
>> >>Your mileage may vary, but from my own experience:
>> >>
>> >>I have owned all three: AL-80, SB1000, and AL80B. They all showed >850
>> >>watts carrier into non-radiating (HA!) loads when measured with
>> Bird 43 and
>> >>2500H slug. They worked very well and, in my not so humble opinion, were
>> >>great bangs for the bux. .....
>> >
>> >Obtaining such power from a single 3-500Z at this anode supply voltage
>> >requires driving the tube to more than its Eimac and Amperex rating
>> >of400mA max.. The result is increased splatter in SSB service. The
>> >designer of this amplifier (Mr. Tom Rauch) claimed that he had a letter
>> >from Eimac that increased the anode current rating to more than 500mA.
>> >He never produced the letter.
>> >- cheers
>> >>
>> >>At 02:27 PM 10/29/1999 -0700, Joe wrote:
>> >>>
>> >>>Hi,
>> >>>I have come across an original Ameritron AL-80
>> >>>amplifier. This is not the AL-80A or AL-80B. Runs a
>> >>>single 3-500Z.
>> >>>
>> >>
>> >>73 from NS1Z, FN44rn
>> >>
>> >>John Wilcox
>> >>871 Route 120
>> >>Rumford, ME 04276-3836
>> >>
>> >>fon: 207-364-2246
>> >>
>> >>--
>> >>FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>> >>Problems: owner-amps@contesting.com
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>> >>
>> >
>> >
>> >- Rich..., 805.386.3734, www.vcnet.com/measures.
>> >
>> >
>> >--
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>> >
>>
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>>
>
>
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