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.
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.
73
Eric
KE2D
----- Original Message -----
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
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> 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
>
>
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>
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>
>
> End of Amps Digest, Vol 15, Issue 19
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