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@contesting.com>
To: <amps@contesting.com>
Sent: Monday, January 24, 2005 4:27 PM
Subject: Amps Digest, Vol 25, Issue 60
Send Amps mailing list submissions to
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When replying, please edit your Subject line so it is more specific
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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@w4zt.com>
Subject: Re: [Amps] GS35b.TUB file?
To: amps@contesting.com
Message-ID: <41F41E0F.40102@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 2
Date: Sun, 23 Jan 2005 22:07:47 +0000
From: Tomm Aldridge <KD7QAE@ARRL.NET>
Subject: Re: [Amps] GS35b.TUB file?
To: Tony King - W4ZT <amps@w4zt.com>
Cc: amps@contesting.com
Message-ID: <41F42033.9070706@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@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 3
Date: Sun, 23 Jan 2005 16:45:40 -0600
From: Robert Wood <rwood90@direcway.com>
Subject: [Amps] Dahl transformer in Alpha
To: amps@contesting.com
Message-ID: <009e01c5019d$4a15e7d0$0100a8c0@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@cox.net>
Subject: [Amps] 30L-1 and 572B
To: <amps@contesting.com>
Message-ID: <008a01c501a3$6736aa60$6600a8c0@ATHLON>
Content-Type: text/plain; charset=Windows-1252
I just purchased a fixer upper Collins 30L-1 amp. It has a bad power
switch
and it may need tubes. I have a brand new set of 572B here. Is it OK to
just drop the 572B's in place of the 811's or do I have to mod the amp in
any way? I am still looking for a power switch. If you have one contact
me
direct.
Thanks,
Carlos. KF4RRN
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
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------------------------------
Message: 5
Date: Sun, 23 Jan 2005 18:54:56 -0500
From: "carl seyersdahl" <carlseye@tampabay.rr.com>
Subject: Re: [Amps] 30L-1 and 572B
To: "Carlos Avellanet [KF4RRN]" <kf4rrn@cox.net>,
<amps@contesting.com>
Message-ID: <028001c501a6$f12bb6e0$f13bca44@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@cox.net>
To: <amps@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@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@cox.net>
Subject: Re: [Amps] 30L-1 and 572B
To: <amps@contesting.com>
Message-ID: <00af01c501a8$59f6fee0$6600a8c0@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@adelphia.net>
Subject: [Amps] OT help
To: "amps@contesting.com" <amps@contesting.com>
Message-ID: <41F457C1.6000709@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@pacbell.net>
Subject: Re: [Amps] Denton Clipperton L
To: "Greg Hicks" <gahicks@cox.net>, <amps@contesting.com>
Message-ID: <010001c501ba$683cb140$7362ce3f@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@cox.net>
To: <amps@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@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@ccia.com>
Subject: [Amps] AMPLIFIER REPAIRS
To: <Amps@contesting.com>
Message-ID: <032401c501bc$0d35b470$32110840@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@w4zt.com>
Subject: Re: [Amps] AMPLIFIER REPAIRS
Cc: Amps@contesting.com
Message-ID: <41F46551.7040809@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
------------------------------
Message: 11
Date: Mon, 24 Jan 2005 03:27:56 +0000
From: Tomm Aldridge <KD7QAE@ARRL.NET>
Subject: [Amps] what is the mu or "amplification factor" of a gs35b???
To: Amps@contesting.com
Message-ID: <41F46B3C.2060205@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?
------------------------------
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End of Amps Digest, Vol 25, Issue 60
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