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Clean Alpha 87A Full Legal Limit +?
Located in Southern California, Inland Empire. Avail. for local demonstration. Pair of Genuine USA Eimac 3cx800a7's Unlocked for 12 meter and 10 meter operation. Full HF coverage includes WARC & MARS operation.? Factory installed optional external fan, allows 100% Full Duty Cycle, unlimited full power key down all modes. Including amp killer FT 8? Upgraded AlphaMax firmware for dynamic automatic tune, dynamic peaking for maximum power efficiency, automatic band selection and remote computer operation direct, or across network and internet for remote station operation. Local pickup is preferred... Shipping available with additional handling and packaging at buyers expense. Transformer will be removed and the amplifier will ship in two separate, certified shipping cartons, insured. I would expect approx $300 insured UPS Ground Additional shipping charges may apply ?Verify before purchase! Thanks for looking.? Check out my latest QRZ.COM Logbook for latest DX worked using this amp... The amp is a joy and luxury to operate! ? I need to liquidate and may consider ready cash best offers,,, sooner before later!? ? These second hand Alpha amps far exceed today's market value prices and probably represent the greatest Full US Legal limit amplifier value bar none!? You ca      n't get more bang for your buck value on any better amplifier, new or old!? These are competion, top tier, world class luxury amplifiers that rate with production amplifiers twice their costs today.
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if pushed hard on 80 and 160.. can and do arc over on the band switch and the wire that runs down thru the switch.? I have had to clean mine..?
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Never heard of a problem with the band switch....there are 9 people, in a group of u, that chat every morning on 75 and they/we all have 82's.
This a new 'issue' to me.
In any case, never had an issue with the band switch on this 82!
Joe W7RKN
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Amp Guy Llc via groups.io Sent: Thursday, June 27, 2024 11:04 AM To: [email protected]Subject: Re: [ham-amplifiers] AL-82 For Sale Best check the band switch prior to a sale, they are pretty much unobtanium at a realistic price. As far as I know you need to order direct from manufacturer of switch, they have a 5k minimum order amount for new customers. On 2024-06-27 11:20, Joe - W7RKN wrote: I am located in Reno, Nevada. I say this right off the bat as this
amplifier I am offering for sale, is too big for me to ship, so¡¡
I have a 6 year old AL-82 legal limit amplifier to sell. I am pretty
sure it has a shorted 3-500z tube. I know it has a suspect T/R relay.
Rather than spend the money for 2 new tubes, I opted on purchasing a
new solid state legal limit amplifier (RF2K-S) from Island Amplifiers.
³§´Ç¡.
The AL-82 is for sale. I will include 3, new, T/R boards for the
amplifier. (AL-82¡¯s have known issues with the T/R relays, so to
make sure I would not have any parts availability issues, I just
bought 3.) It is also wired for 240v operation. I also have the
factory manual¡somewhere..if I can¡¯t find it, I will print out a
good copy.
It is a great amp, capable of well over legal limit, if that is your
bent. I found 500 watts was all I ever needed for my communications
and it just loafed along at that power.
In any case, I am asking $1200 for the amp and spare T/R relays.
Again, no shipping. I am handicapped and I can no longer take it
apart to ship.
±õ²Ô±ç³Ü¾±°ù²â¡¯²õ can be sent to my email address above.
Joe ¨C W7RKN
Reno, Nevada
Links:
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[1] /g/ham-amplifiers/message/40444
[2] /mt/106913052/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
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Best check the band switch prior to a sale, they are pretty much unobtanium at a realistic price. As far as I know you need to order direct from manufacturer of switch, they have a 5k minimum order amount for new customers.
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On 2024-06-27 11:20, Joe - W7RKN wrote: I am located in Reno, Nevada. I say this right off the bat as this
amplifier I am offering for sale, is too big for me to ship, so¡¡
I have a 6 year old AL-82 legal limit amplifier to sell. I am pretty
sure it has a shorted 3-500z tube. I know it has a suspect T/R relay.
Rather than spend the money for 2 new tubes, I opted on purchasing a
new solid state legal limit amplifier (RF2K-S) from Island Amplifiers.
³§´Ç¡.
The AL-82 is for sale. I will include 3, new, T/R boards for the
amplifier. (AL-82¡¯s have known issues with the T/R relays, so to
make sure I would not have any parts availability issues, I just
bought 3.) It is also wired for 240v operation. I also have the
factory manual¡somewhere..if I can¡¯t find it, I will print out a
good copy.
It is a great amp, capable of well over legal limit, if that is your
bent. I found 500 watts was all I ever needed for my communications
and it just loafed along at that power.
In any case, I am asking $1200 for the amp and spare T/R relays.
Again, no shipping. I am handicapped and I can no longer take it
apart to ship.
±õ²Ô±ç³Ü¾±°ù²â¡¯²õ can be sent to my email address above.
Joe ¨C W7RKN
Reno, Nevada
Links:
------
[1] /g/ham-amplifiers/message/40444
[2] /mt/106913052/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
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I am located in Reno, Nevada.? I say this right off the bat as this amplifier I am offering for sale, is too big for me to ship, so¡¡ ? I have a 6 year old AL-82 legal limit amplifier to sell.? I am pretty sure it has a shorted 3-500z tube.? I know it has a suspect T/R relay. Rather than spend the money for 2 new tubes, I opted on purchasing a new solid state legal limit amplifier (RF2K-S) from Island Amplifiers. ³§´Ç¡. The AL-82 is for sale.? I will include 3, new, T/R boards for the amplifier.? (AL-82¡¯s have known issues with the T/R relays, so to make sure I would not have any parts availability issues, I just bought 3.)? It is also wired for 240v operation.? I also have the factory manual¡somewhere..if I can¡¯t find it, I will print out a good copy. ? It is a great amp, capable of well over legal limit, if that is your bent.? I found 500 watts was all I ever needed for my communications and it just loafed along at that power. ? In any case, I am asking $1200 for the amp and spare T/R relays.? Again, no shipping.? I am handicapped and I can no longer take it apart to ship. ? ±õ²Ô±ç³Ü¾±°ù²â¡¯²õ can be sent to my email address above. ? Joe ¨C W7RKN Reno, Nevada
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Re: Bird Termaline load repair
Hmm... I've attached some pix.? The one thing that doesn't fit is that the silver fitting on the wide end/front panel fits that 3/4" copper pipe perfectly; it will not fit any known (to me) dimension of Carborundum resistor.? Of course Bird could have them custom-made, which would explain the outrageous pricing on replacement parts. The second picture tries to show the insides.? The Carborundum resistor is more to the back end; you can see there is copper innards as you move to the wide end.? The resistor and the pipe are joined by a thin copper clamp about 1-1/2" long.? The last picture is the view from the wide end (the pipe is off-center because it has no support). I wish someone else who has the same load could take a pic of the resistor assembly for comparison.? My load appears to be an older version and doesn't quite fit the current documentation on the Bird website. One last item, I did check the silicone oil and the color does seem off...it's a lemon-yellow as opposed to clear or "slightly yellow" as Bird describes it.    
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Re: Bird Termaline load repair
Hold on a sec Scott. If the resistor measures 2.7:1 out of oil it isn't going to improve when in oil. The mention of a copper center conductor makes me wonder if that was added or does it look original? I believe the correct geometry of the resistor is that it connects to the feedpoint with a short section of copper (silver plated) at the wide end of the outer ground plane tapering down to the diameter of the resistor element. If a resistor was added and is shorter than the original one then someone may have used a copper rod to extend it to make connection.
Its been a long time since I had my Bird load out and working on it. I bought the guts of a 1200W load from Don Payne in TN, it has a tapered section with a long (12 inch or more) resistive element, with holes in the tapered ground to allow oil to circulate.
I worked at the Rad Lab in Berkeley and was able to scrounge a nice long piece of rigid coax line with a flanged end for the load to mount on, it was capped off at the other end. They even furnished the oil which was out of a 50 gallon drum, can you imagine how much dielectric oil a cyclotron operation uses?? To be honest I haven't swept the load but at one time when I used it at 144MHz it was flat 1:1 so I would expect it to be J-zero out to 500 MHz.?
I believe the geometry of your resistor to the tapered ground plane may have been altered by someone, that would affect the VSWR vs. freq if the resistor is non-inductive carbon.??
Reid? ?W6MTF
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Re: Bird Termaline load repair
I've been futzing with the Termaline.
Inside there is about a 14" long copper 'shell' that is the 'exponentially tapered line section'.? Inside the shell (which is the coaxial shield) is a 3/4" copper 'center conductor' that clamps to a plain ol' 6"x1" 50 ohm Carborundum tubular resistor (Type SP--rated for use in oil).
I have cleaned all the conducting junctions and substituted the resistor with another, and have checked multiple Bird QC connectors.? Sweeping the unit (outside of the oil bath) shows little change (VSWR ~ 2.7:1 at 435 MHz).
I'm thinking that the only thing left to go wrong is the oil itself.? The oil has some dielectric constant on the order of 2.5-3.0 (so I shouldn't expect to see 1:1) but I wonder (1) does Bird use some specific silicone oil that is controlled for dielectric constant?? and (2) would overheating the oil be a sufficient cause to make the input sweep so poorly when it's all put back together?
The Bird silicone oil is quite expensive and it would be good to have some comfort level for my diagnosis before possibly throwing good money after bad.
TIA,
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Re: 12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 18
Protection board install. Plate and also grid overcurrent protection. Both grid and plate meters have also been re-scaled to the new values required.
https://www.youtube.com/watch?v=zfyRut3DgjI
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Re: Adjusting Ameritron AL-82 input coils
Thanks for the help everyone. Turns out there was a coil slug in the 20m coil. I was able to adjust it and now full power out on 20m.
73;
Steve
NY3A
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Re: Adjusting Ameritron AL-82 input coils
Do all the coils look the same or is the 20 meter coil different? Bob W4JFA
On Mon, Jun 17, 2024 at 5:36?AM Louis Parascondola via <Gudguyham= [email protected]> wrote:
There ?are no??adjustable caps, only the slugs are adjustable.? If you don¡¯t feel the slug someone could have ran it all the way in and if fell out of the slug. ?
On Monday, June 17, 2024, 12:23 AM, Steve Sluz <ny3a@...> wrote:
I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will
really make a difference, but I thought I would try and adjust the input match coil slug on 20m.
This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic
tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?
I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.
It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?
TU;
Steve
NY3A
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Re: Adjusting Ameritron AL-82 input coils
There ?are no??adjustable caps, only the slugs are adjustable. ?If you don¡¯t feel the slug someone could have ran it all the way in and if fell out of the slug. ?
On Monday, June 17, 2024, 12:23 AM, Steve Sluz <ny3a@...> wrote:
I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will
really make a difference, but I thought I would try and adjust the input match coil slug on 20m.
This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic
tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?
I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.
It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?
TU;
Steve
NY3A
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Adjusting Ameritron AL-82 input coils
I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will
really make a difference, but I thought I would try and adjust the input match coil slug on 20m.
This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic
tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?
I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.
It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?
TU;
Steve
NY3A
_._,_._,_
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Re: Bird Termaline load repair
Maybe you can make a short jumper with some L or C (which ever's needed) to tune out the reactance at those UHF freqs? Bob W4JFA?
In? lieu of a DL, what else that works is.....? 160m at high noon......and 10m at midnight.?
On 40m, just find some SW AM broadcast station, and tune all you want.??
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Re: Bird Termaline load repair
In? lieu of a DL, what else that works is.....? 160m at high noon......and 10m at midnight.?
On 40m, just find some SW AM broadcast station, and tune all you want.??
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Re: Bird Termaline load repair
I gave up the oil loads years ago. Also supposed to use a special silicone oil which is not cheap.
I use air cooled loads, this one came out of the att ship to shore site in ocean gate New Jersey.
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On 2024-06-13 11:15, Brandon DX via groups.io wrote: Scott, I wonder if the resistor may have been replaced with one from a
contaminated load or a water load,
not knowing the history on it makes it a Sherlock Holmes case.
Measuring near 50 Ohms dc does show it has a good resistive element
though.
There are two types of elements used for load resistors like this, one
is a glass rod with the film deposited on it, the second is made of
bulk carbon.
I've seen the first type have a contaminated film on the surface over
the carbon that causes it to show increasing RL vs freq.
This occurs in water loads used for long periods with tap water.
Calcium or magnesium or something in the water binds to the surface of
the resistor and affects the performance vs freq. I knew first hand
this happening with a person using well water to cool a Bird load.
Not sure if old oil can contaminate a load though.
The remedy is to clean the resistor rod using alcohol followed by
baking soda in hot water.
If that fails then a new resistor might be available from Altronic
Research in Yellville AR. They make resistors.
GL Reid W6MTF
Links:
------
[1] /g/ham-amplifiers/message/40432
[2] /mt/106621215/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
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Re: Bird Termaline load repair
Scott, I wonder if the resistor may have been replaced with one from a contaminated load or a water load,
not knowing the history on it makes it a Sherlock Holmes case.?
Measuring near 50 Ohms dc does show it has a good resistive element though.?
There are two types of elements used for load resistors like this, one is a glass rod with the film deposited on it, the second is made of bulk carbon.
I've seen the first type have a contaminated film on the surface over the carbon that causes it to show increasing RL vs freq.
This occurs in water loads used for long periods with tap water.? Calcium or magnesium or something in the water binds to the surface of the resistor and affects the performance vs freq.? I knew first hand this happening with a person using well water to cool a Bird load.
Not sure if old oil can contaminate a load though.?
The remedy is to clean the resistor rod using alcohol followed by baking soda in hot water.??
?If that fails then a new resistor might be available from Altronic Research in Yellville AR. They make resistors.
GL? Reid? W6MTF
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Re: Bird Termaline load repair
It is an "exponentially tapered" section.? I can send a picture of the load assembly if that would help with suggestions.
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Re: Bird Termaline load repair
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K6LPM
Pat
Brandon DX
Bob
