[Amps] Amps Digest, Vol 111, Issue 26
K3vw at aol.com
K3vw at aol.com
Fri Mar 16 14:56:25 PDT 2012
I was the Service Manager at Amp Supply in the 80's. The ZC came out with a
RJ1A, vacuum relay which set it apart from the previous models. Willy K3VW
In a message dated 3/16/2012 12:23:58 P.M. Eastern Daylight Time,
amps-request at contesting.com writes:
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Today's Topics:
1. Re: AL-80b Problems - Help Needed (Carl)
2. Re: LK 550-ZC (Carl)
3. Re: LK 550-ZC (Dick Green WC1M)
4. Re: LK 550-ZC (Carl)
5. lk-450NTC (ko1h)
6. Looking for top cover from Alpha 374/76/78 era amp (David Feldman)
7. Re: lk-450NTC (Carl)
8. FT-1000MP Issues? (Tom Horton)
----------------------------------------------------------------------
Message: 1
Date: Thu, 15 Mar 2012 15:05:22 -0400
From: "Carl" <km1h at jeremy.mv.com>
Subject: Re: [Amps] AL-80b Problems - Help Needed
To: <ki6iv at sbcglobal.net>, <amps at contesting.com>
Message-ID: <3E4517445701413283FE27CAD3C1B2E5 at computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Check all bandswitch contacts
Carl
KM1H
----- Original Message -----
From: "Bob Moore" <ki6iv at sbcglobal.net>
To: <amps at contesting.com>
Sent: Thursday, March 15, 2012 2:41 PM
Subject: [Amps] AL-80b Problems - Help Needed
>I need some help in figuring out what the problem is here. Below is a
> summary of what I am experiencing.
>
>
> AL-80b Problems
>
> Normally operate in the 5-700w range, I am very conservative in the amp
> operation. New tube in Dec '05.
>
> Will be operating or lately tuning up and will hear an arch, loses power
> out, but all voltages and ma stay normal.
>
> Started while I was contesting running RTTY at 500w. Started on 15m, I
> could let cool and then be able to go again for a while. Now the problem
> has migrated to 20 and 40. Still works fine on 80 and 160.
>
> All operating voltages and currents are within the perimeters in the
> manual.
>
> When it stops putting power out, I hear the arching which appears to be
> coming from the right hand side of the unit. I have noticed some arching
> "spots" on the plate tuning cap.
>
> I opened the cabinet and did a visual inspection and can see nothing out
> of
> the ordinary other than RFC-2 (Plate Chock) appears to be discolored and
> an
> earlier vintage than what I see in pictures others have posted. (I can
> send
> my pictures if requested).
>
> Any hints how I should proceed for trouble shooting.
>
> I am going to open it up again today and clean the relay.
>
> Bob, K6NV
>
>
> Bob Moore
> Truckee, CA 96161
> (530)575-5766
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
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> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2113/4872 - Release Date: 03/15/12
>
------------------------------
Message: 2
Date: Thu, 15 Mar 2012 15:07:52 -0400
From: "Carl" <km1h at jeremy.mv.com>
Subject: Re: [Amps] LK 550-ZC
To: "Paul Kraemer" <elespe at lisco.com>, "AMPS" <amps at contesting.com>
Message-ID: <C54D3E472D324484930220B9263E159B at computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
There was one late edition combined manual that covered the 450 to 550
Tune
and NT.
Carl
KM1H
----- Original Message -----
From: "Paul Kraemer" <elespe at lisco.com>
To: "AMPS" <amps at contesting.com>
Sent: Thursday, March 15, 2012 2:28 PM
Subject: [Amps] LK 550-ZC
> Can someone help me find a copy of manual for Amp Supply LK-550 ZC.
>
> I have the download from BAMA which covers the 550 but not the ZC
>
> Thanks
>
> Paul K0UYA
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
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> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2113/4872 - Release Date: 03/15/12
>
------------------------------
Message: 3
Date: Thu, 15 Mar 2012 17:12:55 -0400
From: "Dick Green WC1M" <wc1m73 at gmail.com>
Subject: Re: [Amps] LK 550-ZC
To: "'Paul Kraemer'" <elespe at lisco.com>, "AMPS" <amps at contesting.com>
Message-ID: <002101cd02f0$64f5f660$2ee1e320$@gmail.com>
Content-Type: text/plain; charset="us-ascii"
As far as I know, there was no individual manual for the ZC. I think the
"400/500 Series" manual was intended to cover all the variations in both
series. I don't recall exactly what set the ZC apart from other models in
the 550 series, but I think it was QSK. The BAMA manual has the schematic
and some instructions for the QSK Board. Is there some part of the manual
you specifically need?
I happen to have a working LK-500ZC sitting unused in the basement. It has
QSK, but I'm pretty sure it lacks the No-Tune option (it's been a long time
since I used that amp.) I don't recall if it has the "new" step-start
circuit discussed in the BAMA manual, but I think so. It carries the Amp
International label, which I believe indicates that it was one of the last
amps made by Denny before the enterprise went under. The manual that I got
from the previous owner is almost identical to the BAMA version, but
appears
to be an earlier edition. Perhaps that means I have it backwards, and that
the original company was Amp International and the last-gasp company was
Amp
Supply, and that my amp is an earlier model instead of late one. My manual
does have the pages missing from the BAMA manual (3, 15, 21-24), but those
pages don't contain any critical information. The BAMA manual has more
complete schematics and bills of material.
I did a lot of repair work on the amp when I got it. The previous owner's
wife had thrown something at him during a fight (a chair, I think), and the
amp got knocked off the desk. All three tube seals were compromised, and
when the previous owner turned it on, the resulting arc fried the plate
choke and a number of other components. I also replaced a 40m output cap
that was actually broken by the blow to the amp. The meter bezels were
damaged, too. I fixed all that stuff, added a glitch resistor to protect
the
plate choke from future mishaps, replaced all of the meter calibration
resistors (which had either deteriorated or were replaced by a previous
owner with the wrong values in order to fool the ALO circuit, throwing off
the meter readings), slightly increased the fan speed at the low setting to
prevent it cycling into high speed mode so often, and lowered the fan speed
in high speed mode so it wouldn't sound like a freight train.
73, Dick WC1M
> -----Original Message-----
> From: Paul Kraemer [mailto:elespe at lisco.com]
> Sent: Thursday, March 15, 2012 2:29 PM
> To: AMPS
> Subject: [Amps] LK 550-ZC
>
> Can someone help me find a copy of manual for Amp Supply LK-550 ZC.
>
> I have the download from BAMA which covers the 550 but not the ZC
>
> Thanks
>
> Paul K0UYA
------------------------------
Message: 4
Date: Thu, 15 Mar 2012 18:36:05 -0400
From: "Carl" <km1h at jeremy.mv.com>
Subject: Re: [Amps] LK 550-ZC
To: "Dick Green WC1M" <wc1m73 at gmail.com>, "'Paul Kraemer'"
<elespe at lisco.com>, "AMPS" <amps at contesting.com>
Message-ID: <C4BA40A52E5340598C988F98C490CE75 at computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Amp International was the last name, Denny was selling into the commercial
market.
The ZC included the day to day updates to the ZB, and finalized the ALO
circuit, QSK, and the step-start and fan speed. Real late ones had a fan
speed temperature sensor.
Carl
KM1H
----- Original Message -----
From: "Dick Green WC1M" <wc1m73 at gmail.com>
To: "'Paul Kraemer'" <elespe at lisco.com>; "AMPS" <amps at contesting.com>
Sent: Thursday, March 15, 2012 5:12 PM
Subject: Re: [Amps] LK 550-ZC
> As far as I know, there was no individual manual for the ZC. I think the
> "400/500 Series" manual was intended to cover all the variations in both
> series. I don't recall exactly what set the ZC apart from other models in
> the 550 series, but I think it was QSK. The BAMA manual has the schematic
> and some instructions for the QSK Board. Is there some part of the manual
> you specifically need?
>
> I happen to have a working LK-500ZC sitting unused in the basement. It
has
> QSK, but I'm pretty sure it lacks the No-Tune option (it's been a long
> time
> since I used that amp.) I don't recall if it has the "new" step-start
> circuit discussed in the BAMA manual, but I think so. It carries the Amp
> International label, which I believe indicates that it was one of the
last
> amps made by Denny before the enterprise went under. The manual that I
got
> from the previous owner is almost identical to the BAMA version, but
> appears
> to be an earlier edition. Perhaps that means I have it backwards, and
that
> the original company was Amp International and the last-gasp company was
> Amp
> Supply, and that my amp is an earlier model instead of late one. My
manual
> does have the pages missing from the BAMA manual (3, 15, 21-24), but
those
> pages don't contain any critical information. The BAMA manual has more
> complete schematics and bills of material.
>
> I did a lot of repair work on the amp when I got it. The previous owner's
> wife had thrown something at him during a fight (a chair, I think), and
> the
> amp got knocked off the desk. All three tube seals were compromised, and
> when the previous owner turned it on, the resulting arc fried the plate
> choke and a number of other components. I also replaced a 40m output cap
> that was actually broken by the blow to the amp. The meter bezels were
> damaged, too. I fixed all that stuff, added a glitch resistor to protect
> the
> plate choke from future mishaps, replaced all of the meter calibration
> resistors (which had either deteriorated or were replaced by a previous
> owner with the wrong values in order to fool the ALO circuit, throwing
off
> the meter readings), slightly increased the fan speed at the low setting
> to
> prevent it cycling into high speed mode so often, and lowered the fan
> speed
> in high speed mode so it wouldn't sound like a freight train.
>
> 73, Dick WC1M
>
>
>
>> -----Original Message-----
>> From: Paul Kraemer [mailto:elespe at lisco.com]
>> Sent: Thursday, March 15, 2012 2:29 PM
>> To: AMPS
>> Subject: [Amps] LK 550-ZC
>>
>> Can someone help me find a copy of manual for Amp Supply LK-550 ZC.
>>
>> I have the download from BAMA which covers the 550 but not the ZC
>>
>> Thanks
>>
>> Paul K0UYA
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2113/4872 - Release Date: 03/15/12
>
------------------------------
Message: 5
Date: Fri, 16 Mar 2012 03:28:20 -0000
From: "ko1h" <ko1h at cox.net>
Subject: [Amps] lk-450NTC
To: <amps at contesting.com>
Cc: ham_amplifiers at yahoogroups.com
Message-ID: <013801cd0324$d5e84f10$0608a8c0 at johna32bbea6d0>
Content-Type: text/plain; charset="iso-8859-1"
Hi all, Just acquired a lk-450ntc. Had some trouble getting the tube to
light but then all was well for a few days. ( I did a stupid when trying
to get the tube to light and will have a nice scare on my left pinky to tell
tales about) But be that as it may. After getting the tube to light
(Friday last) I hooked it up and was getting power out on 75 into a dummy
load and antenna. Didn't mess with it for a few days turned it on tonight and
a few seconds after hitting the power switch I got a pop in and I think I
saw an arc in the rf compartment.
Figuring heck this happens ( I used to own a few sb220/1's that loved to
bang everyonce in a while) I kept the amp in standby verified that the
exciter was turned down enough and the swr to the antenna was good and fired it
up. Well SWR back to the radio when the amp is keyed to goes through the
roof and the idle plate current in the amp drops to zero. Placing the amp
in standby and through to the antenna a just fine. Tube is lit. 2900v on
the meter for idle dc voltage. Relay can be heard engaging.
Due to this thing biting me last week ( my own stupid) had it turned on
and touched it with the covers off I know luck I'm here) I've got it
unplugged and sitting for the night before I take the covers off.
Any place I should start to look?
Perhaps reseating the tube. The socket on this thing does not please me
and will likely get replaced eventually.
Relay?
Glitch resistor on the tub?
Anything else? (aka the reason I'm posting this most people know
more/better than I do. )
Thanks de John ko1h
------------------------------
Message: 6
Date: Fri, 16 Mar 2012 06:05:48 -0700 (PDT)
From: David Feldman <wb0gaz at yahoo.com>
Subject: [Amps] Looking for top cover from Alpha 374/76/78 era amp
To: amps at contesting.com
Message-ID:
<1331903148.33074.yint-ygo-j2me at web162106.mail.bf1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Looking for a top cover for same - can be ugly but should be basically
straight. If you have one left over from replacement and wish to sell (ship to
Colorado) pls e-mail wb0gaz at yahoo.com
TKs 73
------------------------------
Message: 7
Date: Fri, 16 Mar 2012 11:12:58 -0400
From: "Carl" <km1h at jeremy.mv.com>
Subject: Re: [Amps] lk-450NTC
To: "ko1h" <ko1h at cox.net>, <amps at contesting.com>
Message-ID: <39D963E610C94798999FFB88A443E030 at computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Those NTC amps have a bad habit of arcing the undersized fixed tuned
variables. Most I get in here for service are changed to regular Tune amps
or converted to 6M where either way they work just fine.
Carl
KM1H
---- Original Message -----
From: "ko1h" <ko1h at cox.net>
To: <amps at contesting.com>
Cc: <ham_amplifiers at yahoogroups.com>
Sent: Thursday, March 15, 2012 11:28 PM
Subject: [Amps] lk-450NTC
> Hi all, Just acquired a lk-450ntc. Had some trouble getting the tube
to
> light but then all was well for a few days. ( I did a stupid when
trying
> to get the tube to light and will have a nice scare on my left pinky to
> tell tales about) But be that as it may. After getting the tube to
light
> (Friday last) I hooked it up and was getting power out on 75 into a
dummy
> load and antenna. Didn't mess with it for a few days turned it on
tonight
> and a few seconds after hitting the power switch I got a pop in and I
> think I saw an arc in the rf compartment.
>
> Figuring heck this happens ( I used to own a few sb220/1's that loved to
> bang everyonce in a while) I kept the amp in standby verified that the
> exciter was turned down enough and the swr to the antenna was good and
> fired it up. Well SWR back to the radio when the amp is keyed to goes
> through the roof and the idle plate current in the amp drops to zero.
> Placing the amp in standby and through to the antenna a just fine. Tube
> is lit. 2900v on the meter for idle dc voltage. Relay can be heard
> engaging.
>
> Due to this thing biting me last week ( my own stupid) had it turned on
> and touched it with the covers off I know luck I'm here) I've got it
> unplugged and sitting for the night before I take the covers off.
>
> Any place I should start to look?
>
> Perhaps reseating the tube. The socket on this thing does not please me
> and will likely get replaced eventually.
> Relay?
> Glitch resistor on the tub?
>
> Anything else? (aka the reason I'm posting this most people know
> more/better than I do. )
>
>
> Thanks de John ko1h
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2113/4874 - Release Date: 03/16/12
>
------------------------------
Message: 8
Date: Fri, 16 Mar 2012 09:23:37 -0700 (PDT)
From: Tom Horton <k5iid at sbcglobal.net>
Subject: [Amps] FT-1000MP Issues?
To: amps at contesting.com
Message-ID:
<1331915017.9045.YahooMailClassic at web83102.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Does anyone know of any concerns with driving an amp with an older amp?
Gettin ready to jump into QRO.
Thanks,
?Tom K5IID
"Socialism is a philosophy of failure,
the creed of ignorance, and the gospel of envy,
its inherent virtue is the equal sharing of misery.."
-- Winston Churchill
"Democracy depends on well-informed voters; absent that, it is all mud
flowing down hill."
--Charles Harpole
"Luck is a dividend of sweat. The more you sweat, the luckier you get."
If you don't like my signature, well, I am sorry. But I will use it
because it is what I believe.
K5IID Tom Horton Hillsboro, TX
E sorter for ARRL W5 bureau
Same call for 55 years!
------------------------------
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End of Amps Digest, Vol 111, Issue 26
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