[Amps] Re: Amps Digest, Vol 25, Issue 60
Joe Crawford
crawfish at surfmore.net
Mon Jan 24 01:30:01 EST 2005
Some amps biased the 811A's at -4.5 vdc. To run the 572B's, disconnect the
bias and ground the pins. Reference WB2EGZ article in 73 back in 1966. You
might want to short across input filter choke to raise HV, as the 572B's
like higher voltage than the 811A's.
Joe W4AAB
John and Mary Powell writes:
> Carlos my late father, ZL1ACP re-tubed his 30L1 with 572B's without
> modification and the amp ran fine. He late sold it as re-tubed with no
> adverse comment from the purchaser.
> 73
> John Powell. ZL1BHQ
> ----- Original Message -----
> From: <amps-request at contesting.com>
> To: <amps at contesting.com>
> Sent: Monday, January 24, 2005 4:27 PM
> Subject: Amps Digest, Vol 25, Issue 60
>
>
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>> Today's Topics:
>>
>> 1. Re: GS35b.TUB file? (Tony King - W4ZT)
>> 2. Re: GS35b.TUB file? (Tomm Aldridge)
>> 3. Dahl transformer in Alpha (Robert Wood)
>> 4. 30L-1 and 572B (Carlos Avellanet [KF4RRN])
>> 5. Re: 30L-1 and 572B (carl seyersdahl)
>> 6. Re: 30L-1 and 572B (Carlos Avellanet [KF4RRN])
>> 7. OT help (Roger D Johnson)
>> 8. Re: Denton Clipperton L (Mark - AA6DX)
>> 9. AMPLIFIER REPAIRS (Robert W Epling)
>> 10. Re: AMPLIFIER REPAIRS (Tony King - W4ZT)
>> 11. what is the mu or "amplification factor" of a gs35b???
>> (Tomm Aldridge)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sun, 23 Jan 2005 16:58:39 -0500
>> From: Tony King - W4ZT <amps at w4zt.com>
>> Subject: Re: [Amps] GS35b.TUB file?
>> To: amps at contesting.com
>> Message-ID: <41F41E0F.40102 at w4zt.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> I'd be interested in your data file if you build one. I don't have one.
>>
>> 73, Tony W4ZT
>>
>> Tomm Aldridge wrote:
>> > Before I go and make one, does anyone have a GS35b.TUB data file for teh
>> > TAP2 program?
>> >
>> > Tomm, KD7QAE
>> > _______________________________________________
>> > Amps mailing list
>> > Amps at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sun, 23 Jan 2005 22:07:47 +0000
>> From: Tomm Aldridge <KD7QAE at ARRL.NET>
>> Subject: Re: [Amps] GS35b.TUB file?
>> To: Tony King - W4ZT <amps at w4zt.com>
>> Cc: amps at contesting.com
>> Message-ID: <41F42033.9070706 at ARRL.NET>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> So far have not found one. Am somewhat confused by Gain parameter.
>> Have no idea what that I but if it is power gain, then I suppose 100W in
>> giving 1500W out yields a power gain of 15.
>>
>> Next to do the VgIg interpolation for 8 Ia values and 2 Va values.
>>
>> Name = GS35B (Name of File, use DOS conventions
>> .TUB extension automatically added)
>>
>> VB Max = 4500 (Maximum Plate Voltage Rating)
>>
>> VB Low = 400 (From Grounded Grid Constant Current
>> Characteristics curves.
>>
>> VB High = 1200 (From Grounded Grid Constant Current
>> Characteristics curves. ~ 2 to 3 * VB Low)
>>
>> Gain = 15 (Tube Amplification Factor)
>>
>> Cin = 21.5 (Grid-Cath Capacitance in pF)
>> Cout = 4.5 (Grid-Plate Capacitance in pF)
>>
>> PDiss = 1500 (Max Plate Dissipation of Device)
>> GDiss = 26 (Max Grid Dissipation of Device)
>>
>> Tony King - W4ZT wrote:
>> > I'd be interested in your data file if you build one. I don't have one.
>> >
>> > 73, Tony W4ZT
>> >
>> > Tomm Aldridge wrote:
>> >
>> >> Before I go and make one, does anyone have a GS35b.TUB data file for
>> >> teh TAP2 program?
>> >>
>> >> Tomm, KD7QAE
>> >> _______________________________________________
>> >> 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: 3
>> Date: Sun, 23 Jan 2005 16:45:40 -0600
>> From: Robert Wood <rwood90 at direcway.com>
>> Subject: [Amps] Dahl transformer in Alpha
>> To: amps at contesting.com
>> Message-ID: <009e01c5019d$4a15e7d0$0100a8c0 at SARAH>
>> Content-Type: text/plain; charset=Windows-1252
>>
>>
>> Would like to discuss 3cx800 Tube install in Alpha
>> WITH
>>
>> Dahl transformer that runs higher Plate Voltage
>> with anyone using this model transformer:
>> >From the catalog:
>>
>> ALPHA 76A POWER TRANSFORMER
>> FOR ALPHA MODELS 76A, 76PA, 76CA & 78
>> CORE) B-0393/ C-CORE STYLE #) 10 HIPERSIL C-CORE
>> PR) 120/240 VAC 60 HZ 1 PH
>>
>> S1) 0-1200-1950 VAC @ 0.5A CCS
>>
>> S2) 40 VCT @ 0.5A CCS
>>
>> S3) 25 VAC @ 1A CCS
>>
>> S4) 6.3 VAC @ 9.6A CCS
>>
>> DM) HT = 6.000 WT = 6.325 DT = 6.281 MD = 3.625 MW = 4.000
>> PRICE) $310.00 Plus S&H FOB El Paso, TX WEIGHT) 23 LBS
>>
>> Tnx,
>>
>> Robert W5AJ
>>
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Sun, 23 Jan 2005 17:29:37 -0600
>> From: "Carlos Avellanet [KF4RRN]" <kf4rrn at cox.net>
>> Subject: [Amps] 30L-1 and 572B
>> To: <amps at contesting.com>
>> Message-ID: <008a01c501a3$6736aa60$6600a8c0 at ATHLON>
>> Content-Type: text/plain; charset=Windows-1252
>>
>> I just purchased a fixer upper Collins 30L-1 amp. It has a bad power
> switch
>> and it may need tubes. I have a brand new set of 572B here. Is it OK to
>> just drop the 572B's in place of the 811's or do I have to mod the amp in
>> any way? I am still looking for a power switch. If you have one contact
> me
>> direct.
>>
>> Thanks,
>> Carlos. KF4RRN
>>
>>
>>
>> --
>> No virus found in this outgoing message.
>> Checked by AVG Anti-Virus.
>> Version: 7.0.300 / Virus Database: 265.7.1 - Release Date: 1/19/2005
>>
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Sun, 23 Jan 2005 18:54:56 -0500
>> From: "carl seyersdahl" <carlseye at tampabay.rr.com>
>> Subject: Re: [Amps] 30L-1 and 572B
>> To: "Carlos Avellanet [KF4RRN]" <kf4rrn at cox.net>,
>> <amps at contesting.com>
>> Message-ID: <028001c501a6$f12bb6e0$f13bca44 at tampabay.rr.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Carlos: I can't help you with the switch , but yes, you can run the 572B's
>> without any mods, it's just that it's kind of a waste of good tubes.I
>> wouldn't buy new 572B's , but as long as you've got them you can use them.
>> If it were mine I'd use the tubes only until I could get a new set of
>> 811A's.
>> There is one item that could be fatal to your exciter if you have a
> modern
>> solid state rig. the 30-L1 keying ckt uses 120 volts for the ant. relay.
>> I'd strongly suggest you look into the use of "soft keying" setup to
> reduce
>> the keying voltage requirements. you need to look closely at things like
> the
>> filter caps, and any sign of overheating or other damage also.!!!
>> good luck with your project.!!!
>> carl / kz5ca
>> ----- Original Message -----
>> From: "Carlos Avellanet [KF4RRN]" <kf4rrn at cox.net>
>> To: <amps at contesting.com>
>> Sent: Sunday, January 23, 2005 6:29 PM
>> Subject: [Amps] 30L-1 and 572B
>>
>>
>> > I just purchased a fixer upper Collins 30L-1 amp. It has a bad power
>> switch
>> > and it may need tubes. I have a brand new set of 572B here. Is it OK
> to
>> > just drop the 572B's in place of the 811's or do I have to mod the amp
> in
>> > any way? I am still looking for a power switch. If you have one
> contact
>> me
>> > direct.
>> >
>> > Thanks,
>> > Carlos. KF4RRN
>> >
>> >
>> >
>> > --
>> > No virus found in this outgoing message.
>> > Checked by AVG Anti-Virus.
>> > Version: 7.0.300 / Virus Database: 265.7.1 - Release Date: 1/19/2005
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 6
>> Date: Sun, 23 Jan 2005 18:05:01 -0600
>> From: "Carlos Avellanet [KF4RRN]" <kf4rrn at cox.net>
>> Subject: Re: [Amps] 30L-1 and 572B
>> To: <amps at contesting.com>
>> Message-ID: <00af01c501a8$59f6fee0$6600a8c0 at ATHLON>
>> Content-Type: text/plain; charset=iso-8859-1
>>
>> Thanks for the quick reply and info on the tubes Carl. As for the relay,
>> yes, I never connect an older amp to a newer radio direct, even when some
> of
>> them do work. I have the little Ameritron amp interface that works with
> my
>> SB-220 and L-4B. I am sure it would works just fine with the Collins.
>> Hopefully I'll get to buy me a Collins radio to go with the amp--wishful
>> thinking-- and then I won't have to worry about it. ;>
>>
>> 73,
>> Carlos. KF4RRN
>>
>>
>>
>> > There is one item that could be fatal to your exciter if you have a
>> modern
>> > solid state rig. the 30-L1 keying ckt uses 120 volts for the ant.
> relay.
>> > I'd strongly suggest you look into the use of "soft keying" setup to
>> reduce
>> > the keying voltage requirements. you need to look closely at things like
>> the
>> > filter caps, and any sign of overheating or other damage also.!!!
>> > good luck with your project.!!!
>> > carl / kz5ca
>>
>>
>>
>> --
>> No virus found in this outgoing message.
>> Checked by AVG Anti-Virus.
>> Version: 7.0.300 / Virus Database: 265.7.1 - Release Date: 1/19/2005
>>
>>
>>
>> ------------------------------
>>
>> Message: 7
>> Date: Sun, 23 Jan 2005 21:04:49 -0500
>> From: Roger D Johnson <n1rj at adelphia.net>
>> Subject: [Amps] OT help
>> To: "amps at contesting.com" <amps at contesting.com>
>> Message-ID: <41F457C1.6000709 at adelphia.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> I'd like to thank all those who replied to my problem. I
>> downloaded, and tried, several programs but then had a
>> flash of insight. Since the graphs are designed to be
>> rotated 90 deg for viewing anyway, why not scan them in
>> that way to begin with. I tried it and it works fine!
>>
>> Again thanks to all.
>>
>> 73, Roger
>>
>> --
>> Remember the USS Liberty (AGTR-5)
>> http://ussliberty.org/
>>
>>
>> ------------------------------
>>
>> Message: 8
>> Date: Sun, 23 Jan 2005 18:12:51 -0800
>> From: "Mark - AA6DX" <aa6dx at pacbell.net>
>> Subject: Re: [Amps] Denton Clipperton L
>> To: "Greg Hicks" <gahicks at cox.net>, <amps at contesting.com>
>> Message-ID: <010001c501ba$683cb140$7362ce3f at two>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> Greg .. those amps are FAMOUS for un-soldering their own components ...
>> check for that problem .. a nice hefty iron will cure a bunch of problems!
>> I had 2wo of those that did that! 73 .. Mark, AA6DX
>>
>> ----- Original Message -----
>> From: "Greg Hicks" <gahicks at cox.net>
>> To: <amps at contesting.com>
>> Sent: Saturday, January 22, 2005 7:28 PM
>> Subject: [Amps] Denton Clipperton L
>>
>>
>> >I was given a Clipperton L and the guy thought it worked (It did before
> he
>> > loaned it to someone). It powered up, the four tubes had filament glow.
>> > I
>> > had plate voltage but no plate current.
>> >
>> > Driving with 50 watts did not produce any output. After checking for
>> > mechanical problems, I found that resistor on one of the tubes loose and
>> > repaired. I then found one of the 500 mfd caps bad (after it exploded
>> > during testing). With the electrolytic cap out the plate voltage is
>> > obviously lower, but still have no plate current.
>> >
>> > With no drive from the exciter there is no plate current.
>> >
>> > Any quick suggestions?
>> > Greg
>> > WM5D
>> >
>> >
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 9
>> Date: Sun, 23 Jan 2005 21:26:02 -0500
>> From: "Robert W Epling" <no3i at ccia.com>
>> Subject: [Amps] AMPLIFIER REPAIRS
>> To: <Amps at contesting.com>
>> Message-ID: <032401c501bc$0d35b470$32110840 at MAIN01>
>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> reply-type=original
>>
>> Hello List
>> I am looking for recommendations on who does good amplifier repair work. I
>> have a completely modified sb200 set up for 6 meters.I know about Harbachs
>> but they are out of business for a while due to wx damages. Any help would
>> be appreciated.
>> Thanks
>> Bob
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 10
>> Date: Sun, 23 Jan 2005 22:02:41 -0500
>> From: Tony King - W4ZT <amps at w4zt.com>
>> Subject: Re: [Amps] AMPLIFIER REPAIRS
>> Cc: Amps at contesting.com
>> Message-ID: <41F46551.7040809 at w4zt.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Try Milton, N4DA, at <http://www.n4da.com>
>>
>> He does good work, has lots of experience and servicing ham gear is his
>> business.
>>
>> 73, Tony W4ZT
>>
>> Robert W Epling wrote:
>> > Hello List
>> > I am looking for recommendations on who does good amplifier repair work.
>> > I have a completely modified sb200 set up for 6 meters.I know about
>> > Harbachs but they are out of business for a while due to wx damages. Any
>> > help would be appreciated.
>> > Thanks
>> > Bob
>> >
>> > _______________________________________________
>> > Amps mailing list
>> > Amps at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>> >
>>
>>
>>
>> ------------------------------
>>
>> Message: 11
>> Date: Mon, 24 Jan 2005 03:27:56 +0000
>> From: Tomm Aldridge <KD7QAE at ARRL.NET>
>> Subject: [Amps] what is the mu or "amplification factor" of a gs35b???
>> To: Amps at contesting.com
>> Message-ID: <41F46B3C.2060205 at ARRL.NET>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> In trying to use TAP2 program, the question of the amplification factor
>> comes up as it is requested in the data entry. I cannot find it speced
>> anywhere for the gs35b. Anybody know what it is?
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> End of Amps Digest, Vol 25, Issue 60
>> ************************************
>>
>>
>>
>
>
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