>Thanks for all the replies to my TL922 troubleshooting issue.
>
>Amazing what happens when you walk away from something and go back to it
>with a clear mind the next day! I found that the plate blocking (DC-RF)
>cap C34 (1000pf/15kv) had a crack and a black line thru the side of it. I
>guess the higher plate voltage (SSB vs. CW) was enough to arc across the
>cap's dielectric material.
? Does the capacitor with the crack measure zero-ohms?
>
>Now off to secure a replacement. BTW, the manual calls for a 2000pf,
>whereas the amp came with a 1000pf. I guess there was a change somewhere
>along the line. It appears that Kenwood parts still has them at around $40,
>so I'll order one tomorrow.
? 500pF would work as well due to the high-Z present.
>
cheers, Eric
>From: <amps-request@contesting.com>
>To: <amps@contesting.com>
>Sent: Sunday, March 14, 2004 12:00 PM
>Subject: Amps Digest, Vol 15, Issue 19
>
>
>> Send Amps mailing list submissions to
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>>
>> Today's Topics:
>>
>> 1. Re: noisy sb1000 (R.Measures)
>> 2. Re: Interesting news (R.Measures)
>> 3. Re: Interesting news (Jeff Weinberg W8CQ)
>> 4. Re: Interesting news (on4kj)
>> 5. Re: Switch-mode HV power supply (jeff millar)
>> 6. Re: Interesting news (Joe Isabella)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Date: Sun, 14 Mar 2004 03:21:13 -0800
>> From: R.Measures <r@somis.org>
>> To: "George" <ne2i@optonline.net>, " AMPS" <amps@contesting.com>
>> Subject: Re: [Amps] noisy sb1000
>> Message-ID: <20040314112238.5F694319343@dayton.akorn.net>
>> Content-Type: text/plain; charset="iso-8859-1"
>> MIME-Version: 1.0
>> Content-Transfer-Encoding: quoted-printable
>> Precedence: list
>> Message: 1
>>
>> =95 Potting a transformer in polyester laminating resin is one solution.
>> This procedure is not complicated, and it's described on my Website under
>> Amplifiers.
>>
>> >HI
>> >The sb1000 is working now and keys fine but the PS is really noisy
>(buzzin=
>> g)
>> >unkeyed. Does any one else have any experience with this. any
>> >recommendations?
>> >Im going to try and tighten down the XFMR mount bolts tomorrow to be
>shure=
>> ..
>> >
>> >George NE2I
>> >_______________________________________________
>> >Amps mailing list
>> >Amps@contesting.com
>> >http://lists.contesting.com/mailman/listinfo/amps
>> >
>> ------------------------------
>>
>> Date: Sun, 14 Mar 2004 03:21:14 -0800
>> From: R.Measures <r@somis.org>
>> To: "Leigh S. Jones" <kr6x@kr6x.com>, "AMPS" <amps@contesting.com>
>> Subject: Re: [Amps] Interesting news
>> Message-ID: <20040314112238.61D39319689@dayton.akorn.net>
>> Content-Type: text/plain; charset="iso-8859-1"
>> MIME-Version: 1.0
>> Content-Transfer-Encoding: quoted-printable
>> Precedence: list
>> Message: 2
>>
>> =95 According to Google, there appears to be no file on the Internet
>> matching 3CX1500D7.
>> ------------------------------
>>
>> Date: Sun, 14 Mar 2004 08:10:19 -0500
>> From: "Jeff Weinberg W8CQ" <w8cq@bright.net>
>> To: "AMPS" <amps@contesting.com>
>> Subject: Re: [Amps] Interesting news
>> Message-ID: <000801c409c5$b3fb88b0$279edb42@w8cq1>
>> References: <017301c408b7$499ab6d0$ede3c23f@KR6X.ORG>
>> Content-Type: text/plain;
>> charset="Windows-1252"
>> MIME-Version: 1.0
>> Content-Transfer-Encoding: 7bit
>> Precedence: list
>> Message: 3
>>
>> This sounds really interesting! I would love to get my hands on one of
>> these to play around with for a while. I checked the Eimac/CPI web site,
>> but did not find anything about it yet.
>>
>>
>> Jeff Weinberg W8CQ
>> Harbach Electronics
>> 468 County Road 620
>> Polk, OH 44866
>> (419) 945-2359
>> http://www.harbachelectronics.com
>> ---------------------------------------------------------
>>
>> ----- Original Message -----
>> From: "Leigh S. Jones" <kr6x@kr6x.com>
>> To: "AMPS" <amps@contesting.com>
>> Sent: Friday, March 12, 2004 11:54 PM
>> Subject: [Amps] Interesting news
>>
>>
>> > Eimac Offers New Radio Power Tube
>> > The Eimac division of CPI is out with a new power tube for radio
>> > transmitters that will be on display at the NAB show.
>> >
>> > The air-cooled 3CX1500D7 ceramic metal triode operates at 5 volts, 30
>> > amps. The company said it delivers the same performance in many
>> > applications as a pair of 3-500Z glass tubes.
>> >
>> > "With output power capability above 2 kilowatts from this single new
>> > tube, actual usage at 1500 Watts does not even begin to approach the
>> > design limits," according to spokesman John Allan in the company's
>> > announcement.
>> >
>> > "Mounting is in the same SK-410 socket used by the 3-500Z, and the
>> > filament voltage is the same. Since the 3CX1500D7 filament current
>> > matches that of two 3-500Zs, we do advise that related circuitry (such
>> > as RF chokes) be checked for their ratings if this tube is applied in
>> > a retrofit. It may be operated in zero-bias, grounded grid
>> > configuration at plate voltages up to 3kV, and may be operated up to
>> > 6kV with appropriate grid bias."
>> >
>> > He said the device will interest equipment manufacturers and DXers for
>> > use in RF linear amplifiers.
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> ------------------------------
>>
>> Date: Sun, 14 Mar 2004 14:15:44 +0100
>> From: "on4kj" <on4kj@skynet.be>
>> To: "Leigh S. Jones" <kr6x@kr6x.com>, "AMPS" <amps@contesting.com>
>> Subject: Re: [Amps] Interesting news
>> Message-ID: <002301c409c6$75368b60$5ca2c850@hermansjos>
>> References: <017301c408b7$499ab6d0$ede3c23f@KR6X.ORG>
>> Content-Type: text/plain;
>> charset="Windows-1252"
>> MIME-Version: 1.0
>> Content-Transfer-Encoding: 7bit
>> Precedence: list
>> Message: 4
>>
>> Is this the bigger big big brother from the old miniature triode 6CW4 ?
>> We used the 6CW4 as a HF amplifier in the sixties, but only in VHF
>> receivers front end.
>> I just wonder what will be the prices of such a beast.
>> Are there yet caracteristics available ?
>> Hopefully this power tube can work on higher frequencies then 30Mc/s
>> Thanks for some more info.
>>
>> Jos ON4KJ ( OR4G operator )
>>
>> ----- Original Message -----
>> From: "Leigh S. Jones" <kr6x@kr6x.com>
>> To: "AMPS" <amps@contesting.com>
>> Sent: Saturday, March 13, 2004 5:54 AM
>> Subject: [Amps] Interesting news
>>
>>
>> > Eimac Offers New Radio Power Tube
>> > The Eimac division of CPI is out with a new power tube for radio
>> > transmitters that will be on display at the NAB show.
>> >
>> > The air-cooled 3CX1500D7 ceramic metal triode operates at 5 volts, 30
>> > amps. The company said it delivers the same performance in many
>> > applications as a pair of 3-500Z glass tubes.
>> >
>> > "With output power capability above 2 kilowatts from this single new
>> > tube, actual usage at 1500 Watts does not even begin to approach the
>> > design limits," according to spokesman John Allan in the company's
>> > announcement.
>> >
>> > "Mounting is in the same SK-410 socket used by the 3-500Z, and the
>> > filament voltage is the same. Since the 3CX1500D7 filament current
>> > matches that of two 3-500Zs, we do advise that related circuitry (such
>> > as RF chokes) be checked for their ratings if this tube is applied in
>> > a retrofit. It may be operated in zero-bias, grounded grid
>> > configuration at plate voltages up to 3kV, and may be operated up to
>> > 6kV with appropriate grid bias."
>> >
>> > He said the device will interest equipment manufacturers and DXers for
>> > use in RF linear amplifiers.
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>
>> ------------------------------
>>
>> Date: Sun, 14 Mar 2004 08:43:43 -0500
>> From: jeff millar <wa1hco@adelphia.net>
>> To: Oleg Skydan <skidan@mail.ints.net>
>> Cc: amps@contesting.com
>> Subject: Re: [Amps] Switch-mode HV power supply
>> Message-ID: <4054618F.1040406@adelphia.net>
>> In-Reply-To: <005301c40917$04464b70$2a2c42d4@CAT>
>> References: <TUx0GJNr8GUAFAIY@ifwtech.co.uk>
><QXKE2LGGPXUAFA5W@ifwtech.co.uk>
>> <005301c40917$04464b70$2a2c42d4@CAT>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>> MIME-Version: 1.0
>> Content-Transfer-Encoding: 7bit
>> Precedence: list
>> Message: 5
>>
>> Oleg...
>>
>> Can you provide a URL? Google could not find the site you mention.
>>
>> jeff, wa1hco
>>
>> Oleg Skydan wrote:
>>
>> >Hi, All !
>> >
>> >
>> >
>> >>The reason for this inquiry is that I'm preparing a talk on power amps
>> >>for the GM DX Convention. They have asked me to include some comments
>> >>about "tubes v transistors" with a focus on DXing, contesting and
>> >>DXpeditions. Comparing cost, size, weight and reliability for the two
>> >>different technologies, an interesting question pops up: are our
>> >>existing tube amps as small and lightweight as they could be?
>> >>
>> >>
>> >>
>> >
>> >Check the DL2KQ web site. There is a lot of info about the compact
>> >power amplifiers with transformerless power supply. He uses a 220-240V
>> >mains with 4x rectifier-multiplier. The isolation is achived by using HF
>> >transformer at the PA's input and capacitors (3000 pF) at the output.
>> >
>> >Many hams use such constructions in the former USSR and they are
>> >very satisfied.
>> >
>> >All the best !
>> >Oleg Skydan
>> >UR3IQO
>> >_______________________________________________
>> >Amps mailing list
>> >Amps@contesting.com
>> >http://lists.contesting.com/mailman/listinfo/amps
>> >
>> >
>> >
>> ------------------------------
>>
>> Date: Sun, 14 Mar 2004 06:36:43 -0800 (PST)
>> From: Joe Isabella <n3ji@yahoo.com>
>> To: Amps <amps@contesting.com>
>> Subject: Re: [Amps] Interesting news
>> Message-ID: <20040314143643.56765.qmail@web14103.mail.yahoo.com>
>> In-Reply-To: <017301c408b7$499ab6d0$ede3c23f@KR6X.ORG>
>> Content-Type: text/plain; charset=us-ascii
>> MIME-Version: 1.0
>> Precedence: list
>> Message: 6
>>
>> Any hint of cost for one of these? Will it be at least in the ballpark of
>a pair of 3-500s??
>> Part of the appeal of those tubes is that they're rugged as hell and won't
>break the bank if you
>> do manage to tear 'em up.
>>
>> Joe,
>> N3JI
>>
>> --- "Leigh S. Jones" <kr6x@kr6x.com> wrote:
>> > Eimac Offers New Radio Power Tube
>> > The Eimac division of CPI is out with a new power tube for radio
>> > transmitters that will be on display at the NAB show.
>> >
>> > The air-cooled 3CX1500D7 ceramic metal triode operates at 5 volts, 30
>> > amps. The company said it delivers the same performance in many
>> > applications as a pair of 3-500Z glass tubes.
>> >
>> > "With output power capability above 2 kilowatts from this single new
>> > tube, actual usage at 1500 Watts does not even begin to approach the
>> > design limits," according to spokesman John Allan in the company's
>> > announcement.
>> >
>> > "Mounting is in the same SK-410 socket used by the 3-500Z, and the
>> > filament voltage is the same. Since the 3CX1500D7 filament current
>> > matches that of two 3-500Zs, we do advise that related circuitry (such
>> > as RF chokes) be checked for their ratings if this tube is applied in
>> > a retrofit. It may be operated in zero-bias, grounded grid
>> > configuration at plate voltages up to 3kV, and may be operated up to
>> > 6kV with appropriate grid bias."
>> >
>> > He said the device will interest equipment manufacturers and DXers for
>> > use in RF linear amplifiers.
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> __________________________________
>> Do you Yahoo!?
>> Yahoo! Mail - More reliable, more storage, less spam
>> http://mail.yahoo.com
>> ------------------------------
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> End of Amps Digest, Vol 15, Issue 19
>> ************************************
>
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