[Amps] 3xx3000 at 144. Re: Amps Digest, Vol 206, Issue 9
Joe
nss at mwt.net
Thu Feb 6 12:55:07 EST 2020
For tubes like this, BIG currents on the filaments.
Has anyone made a switcher supply for it?
Joe WB9SBD
On 2/6/2020 11:43 AM, dj7ww at t-online.de wrote:
> My 3CX3000F7 does well on 2m.
>
> 73
> Peter
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Steven Simons
> Sent: Donnerstag, 6. Februar 2020 03:59
> To: amps at contesting.com
> Subject: [Amps] 3xx3000 at 144. Re: Amps Digest, Vol 206, Issue 9
>
> Conrad,
> I built a 150MHz amp using a 3cX20000 for an industrial customer. This tube
> is rated at 110mhz buts worked fine at 150. Did 24kw out - could have gotten
> close to 30 but ran out of drive. So, the 3cx3000 should work at 144.
> de:W1SMS
>
> Steve Simons
> Manitou Systems Inc.
> Tel.203.733.2110
> ssimons at manitousys.com
> Sent from my iPhone
>
>> On Feb 5, 2020, at 9:49 PM, amps-request at contesting.com wrote:
>>
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>> Today's Topics:
>>
>> 1. Re: 3CX3000A7 on 144 MHz (Carl)
>> 2. Re: Amp causing RFI new attempt on the original request
>> (Henk Remijn PA5KT)
>> 3. Re: Amp causing RFI new attempt on the original request
>> (Alek Petkovic)
>> 4. Re: Amp causing RFI new attempt on the original request
>> (Steven Katz)
>> 5. Re: Amp causing RFI new attempt on the original request
>> (Jim Klein)
>> 6. Re: Amp causing RFI Update (Jim)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 5 Feb 2020 12:11:35 -0500
>> From: "Carl" <km1h at jeremy.qozzy.com>
>> To: "Conrad PA5Y" <g0ruz at g0ruz.com>, <amps at contesting.com>
>> Subject: Re: [Amps] 3CX3000A7 on 144 MHz
>> Message-ID: <2B9590F2A566405A888E867BB25ABCB0 at computer1>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> That would be a real stretch since the maximum frequency rating is 110 MHz
>> and even if it could be made to work efficiency would be low.
>>
>> Are there any European TV tubes available at affordable prices?
>>
>> Carl
>>
>>
>> ----- Original Message -----
>> From: "Conrad PA5Y" <g0ruz at g0ruz.com>
>> To: <amps at contesting.com>
>> Sent: Tuesday, February 04, 2020 2:35 PM
>> Subject: [Amps] 3CX3000A7 on 144 MHz
>>
>>
>>> I have just acquired 2 x 3CX3000A7 and I would like to put one on 2m.
>>>
>>>
>>>
>>> I have a few designs for but before I start I have 2 questions.
>>>
>>>
>>>
>>> The Heater current is 7.5V @ 51A - does anyone use a switch mode PSU?
> Not
>>> sure if Meanwell have anything suitable but that is where I would
> probably
>>> start. Otherwise I have no idea where to get a custom transformer wound
> in
>>> the Netherlands, which is where I live these days.
>>>
>>>
>>>
>>> I do not want to run in AB2 all the time am I correct to assume that I
> can
>>> just switch in a Zener with a pass transistor to bias to class C? I have
>>> never used a zero bias tube before.
>>>
>>>
>>>
>>> I could use a GM3SEK triode board of course!
>>>
>>>
>>>
>>> I already have a 4.5kV supply that will drop down to 4.2kV on load, if
>>> anyone is using a 3CX3000A7 on VHF I would also like to know how much
> gain
>>> to expect. I do not expect the 144MHz performance to differ from that of
>>> 110 MHz based on observations with a YC-156.
>>>
>>>
>>>
>>> Regards
>>>
>>>
>>>
>>> Conrad PA5Y
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Wed, 5 Feb 2020 18:38:48 +0100
>> From: Henk Remijn PA5KT <pa5kt at remijn.net>
>> To: amps at contesting.com
>> Subject: Re: [Amps] Amp causing RFI new attempt on the original
>> request
>> Message-ID: <7811a8dd-e6f8-cac9-34a9-03b96798acaf at remijn.net>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> I think this is an interesting question which deserves a better answer
>> then the ground loop discussion.
>>
>> The Tentec is a solid state amplifier and the SB220 is using tubes.
>>
>> In general tube amps are more lineair then solid state.
>>
>> I would try to measure them on a spectrum analyzer to see if there is a
>> different in produced spectrum.
>> Based on that you might consider an additional filter on your amplifier.
>>
>> Most likely the cheapest solution is some kind of ferrite around the
>> wires of the light.
>>
>> 73 Henk PA5KT
>>
>> Op 28-1-2020 om 17:37 schreef Gary Hendricks:
>>> I have a Tentec Hercules II amplifier. When I am on 40 meters only it
>>> sets off my neighbors outside motion light. I know these lights are a
>>> problem, but what has me concerned is when I run my old SB-230 at the
>>> same power level his light does not come on.
>>> Do you think this indicates some purity issues with the Tentec amp?
>>> Maybe something in the VHF range?
>>> I wonder if an old fashioned low pass filter might help. Any ideas?
>>> Gary K4MT
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Thu, 6 Feb 2020 06:47:15 +0800
>> From: Alek Petkovic <vk6apk at bigpond.com>
>> To: amps at contesting.com
>> Subject: Re: [Amps] Amp causing RFI new attempt on the original
>> request
>> Message-ID: <6937f0e8-bd3a-edcb-72e5-995d504ad7fa at bigpond.com>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> From 1-5 on grounding, in the Ten Tec maual.
>>
>> "In the interst of personal safety and to reduce the possibility of
>> stray RF pickup on interconnecting cables, all station equipment should
>> be well grounded to earth. It is important to strap all equipment
>> chassis together with short heavy wire."
>>
>> The SB-230 may not be as susceptible to problems, as the Ten Tec, when
>> it comes to grounding.
>>
>> If you are getting stray RF back into the driving transmitter, then this
>> will be amplified and may cause any number of problems, including the
>> Uncle Fester light bulb effect.
>>
>> 73, Alek. VK6APK
>>
>>
>>> On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
>>> I think this is an interesting question which deserves a better answer
>>> then the ground loop discussion.
>>>
>>> The Tentec is a solid state amplifier and the SB220 is using tubes.
>>>
>>> In general tube amps are more lineair then solid state.
>>>
>>> I would try to measure them on a spectrum analyzer to see if there is
>>> a different in produced spectrum.
>>> Based on that you might consider an additional filter on your amplifier.
>>>
>>> Most likely the cheapest solution is some kind of ferrite around the
>>> wires of the light.
>>>
>>> 73 Henk PA5KT
>>>
>>> Op 28-1-2020 om 17:37 schreef Gary Hendricks:
>>>> I have a Tentec Hercules II amplifier. When I am on 40 meters only it
>>>> sets off my neighbors outside motion light. I know these lights are a
>>>> problem, but what has me concerned is when I run my old SB-230 at the
>>>> same power level his light does not come on.
>>>> Do you think this indicates some purity issues with the Tentec amp?
>>>> Maybe something in the VHF range?
>>>> I wonder if an old fashioned low pass filter might help. Any ideas?
>>>> Gary K4MT
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Wed, 5 Feb 2020 23:08:23 +0000
>> From: Steven Katz <stevek at jmr.com>
>> To: Alek Petkovic <vk6apk at bigpond.com>, "amps at contesting.com"
>> <amps at contesting.com>
>> Subject: Re: [Amps] Amp causing RFI new attempt on the original
>> request
>> Message-ID:
>>
> <BY5PR16MB319015BA59E569DBE90CFBF2DA020 at BY5PR16MB3190.namprd16.prod.outlook.
> com>
>>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> The Hercules II uses a separate 14V 80A power supply and the
> interconnecting DC power cable is hot as hell, in my experience -- having
> owned one back in the 90s.
>> Big difference between that and the self-contained SB-230.
>>
>> Steve, WB2WIK
>>
>> -----Original Message-----
>> From: Amps <amps-bounces at contesting.com> On Behalf Of Alek Petkovic
>> Sent: Wednesday, February 5, 2020 2:47 PM
>> To: amps at contesting.com
>> Subject: Re: [Amps] Amp causing RFI new attempt on the original request
>>
>> From 1-5 on grounding, in the Ten Tec maual.
>>
>> "In the interst of personal safety and to reduce the possibility of stray
> RF pickup on interconnecting cables, all station equipment should be well
> grounded to earth. It is important to strap all equipment chassis together
> with short heavy wire."
>> The SB-230 may not be as susceptible to problems, as the Ten Tec, when it
> comes to grounding.
>> If you are getting stray RF back into the driving transmitter, then this
> will be amplified and may cause any number of problems, including the Uncle
> Fester light bulb effect.
>> 73, Alek. VK6APK
>>
>>
>>> On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
>>> I think this is an interesting question which deserves a better answer
>>> then the ground loop discussion.
>>>
>>> The Tentec is a solid state amplifier and the SB220 is using tubes.
>>>
>>> In general tube amps are more lineair then solid state.
>>>
>>> I would try to measure them on a spectrum analyzer to see if there is
>>> a different in produced spectrum.
>>> Based on that you might consider an additional filter on your amplifier.
>>>
>>> Most likely the cheapest solution is some kind of ferrite around the
>>> wires of the light.
>>>
>>> 73 Henk PA5KT
>>>
>>> Op 28-1-2020 om 17:37 schreef Gary Hendricks:
>>>> I have a Tentec Hercules II amplifier. When I am on 40 meters only it
>>>> sets off my neighbors outside motion light. I know these lights are a
>>>> problem, but what has me concerned is when I run my old SB-230 at the
>>>> same power level his light does not come on.
>>>> Do you think this indicates some purity issues with the Tentec amp?
>>>> Maybe something in the VHF range?
>>>> I wonder if an old fashioned low pass filter might help. Any ideas?
>>>> Gary K4MT
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Wed, 5 Feb 2020 18:04:06 -0800
>> From: Jim Klein <k7rdx at charter.net>
>> To: Steven Katz <stevek at jmr.com>
>> Cc: Alek Petkovic <vk6apk at bigpond.com>, "amps at contesting.com"
>> <amps at contesting.com>
>> Subject: Re: [Amps] Amp causing RFI new attempt on the original
>> request
>> Message-ID:
>> <CACwjSsXV4VRTC0Jz9jhFi7XN3B3U8Lp=fJeowVSNXZ7pKo6KYw at mail.gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Many years ago in the 1970`s I ran 4-1000A amplifiers on the Low Bands.I
>> have a neighbor who has fluorescent lamps on his front porch and my SSB
>> modulation would make the lamps talk..Literally...And flash...I had very
>> good grounding and still had issues...Nowadays I run YC-156A amps and no
>> problems of any kind...Very clean tube when set-Up and run properly.
> Ground
>> Loop is also a common problem for several Hams,follow advice from
>> Engineering people and solve your issues easily...Hello
> all&73..Jim..K7RDX..
>>> On Wed, Feb 5, 2020 at 3:08 PM Steven Katz <stevek at jmr.com> wrote:
>>>
>>> The Hercules II uses a separate 14V 80A power supply and the
>>> interconnecting DC power cable is hot as hell, in my experience -- having
>>> owned one back in the 90s.
>>>
>>> Big difference between that and the self-contained SB-230.
>>>
>>> Steve, WB2WIK
>>>
>>> -----Original Message-----
>>> From: Amps <amps-bounces at contesting.com> On Behalf Of Alek Petkovic
>>> Sent: Wednesday, February 5, 2020 2:47 PM
>>> To: amps at contesting.com
>>> Subject: Re: [Amps] Amp causing RFI new attempt on the original request
>>>
>>> From 1-5 on grounding, in the Ten Tec maual.
>>>
>>> "In the interst of personal safety and to reduce the possibility of stray
>>> RF pickup on interconnecting cables, all station equipment should be well
>>> grounded to earth. It is important to strap all equipment chassis
> together
>>> with short heavy wire."
>>>
>>> The SB-230 may not be as susceptible to problems, as the Ten Tec, when it
>>> comes to grounding.
>>>
>>> If you are getting stray RF back into the driving transmitter, then this
>>> will be amplified and may cause any number of problems, including the
> Uncle
>>> Fester light bulb effect.
>>>
>>> 73, Alek. VK6APK
>>>
>>>
>>>> On 6/02/2020 1:38 am, Henk Remijn PA5KT via Amps wrote:
>>>> I think this is an interesting question which deserves a better answer
>>>> then the ground loop discussion.
>>>>
>>>> The Tentec is a solid state amplifier and the SB220 is using tubes.
>>>>
>>>> In general tube amps are more lineair then solid state.
>>>>
>>>> I would try to measure them on a spectrum analyzer to see if there is
>>>> a different in produced spectrum.
>>>> Based on that you might consider an additional filter on your amplifier.
>>>>
>>>> Most likely the cheapest solution is some kind of ferrite around the
>>>> wires of the light.
>>>>
>>>> 73 Henk PA5KT
>>>>
>>>> Op 28-1-2020 om 17:37 schreef Gary Hendricks:
>>>>> I have a Tentec Hercules II amplifier. When I am on 40 meters only it
>>>>> sets off my neighbors outside motion light. I know these lights are a
>>>>> problem, but what has me concerned is when I run my old SB-230 at the
>>>>> same power level his light does not come on.
>>>>> Do you think this indicates some purity issues with the Tentec amp?
>>>>> Maybe something in the VHF range?
>>>>> I wonder if an old fashioned low pass filter might help. Any ideas?
>>>>> Gary K4MT
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>> _______________________________________________
>>>> Amps mailing list
>>>> Amps at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
>> ------------------------------
>>
>> Message: 6
>> Date: Wed, 5 Feb 2020 20:50:06 -0600
>> From: Jim <jimw7ry at gmail.com>
>> To: amps at contesting.com
>> Subject: Re: [Amps] Amp causing RFI Update
>> Message-ID: <4b14d916-0b68-ce55-07b5-7f155035ade8 at gmail.com>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> The 500+ page Motorola R56 Grounding and bonding for Communications
>> manual is available for free download from Motorola On Line, or perhaps
>> other places on line.
>> The 2005 manual is the old one. The 2016 version is the current one.
>> It's (the 2016 version) is quite a bit larger that the 2005 version.
>>
>>
>>
>>
>> Thanks
>> 73
>> Jim W7RY
>>
>>> On 2/5/2020 9:50 AM, Glen Zook via Amps wrote:
>>> Another thing is that there are various "schools" on grounding, lightning
> protection, etc., and one group of "experts" can have considerably different
> opinions on proper techniques.? To compound things even more, a significant
> number of "experts" recommend things from several different schools.
>>> There are those "experts" who absolutely refuse to recognize that there
> can be more than one way to "skin a cat" and get very belligerent if someone
> even proposes techniques that differ even so slightly from "their" methods.?
> Then, there are those "experts" who do recognize that "their" methods are
> just among several other methods that can also produce an excellent
> grounding system.
>>> Over the decades, the methods that I recommend have been adopted by
> certain entities such as television transmitter manufacturers and different
> government agencies (from local to Federal).? But, I certainly do NOT insist
> that "my" methods are the "only" correct methods.? In fact, I recommend
> that, if the person so desires, various methods be examined and
> complimentary techniques be included in the individual's grounding system.
>>>
>>> Glen, K9STH
>>> Website: https://k9sth.net
>>>
>>>
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> ------------------------------
>>
>> End of Amps Digest, Vol 206, Issue 9
>> ************************************
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>
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>
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