That choke is meant for small desk top amps with small tubes. Any commercial 3000 amp would have a much larger choke or two chokes. I have three of those failed here from different amps and olate modulated amps. If you get a flash over or surpass the current rating it will expand and unwind. I tried to run a pair of 3-1000z tubes at 5000 to 6000 volts and every time they failed. Finally went to a much larger choke. You might get away with it for now but not at high power and not if you you have an event at tube side or tank.?
Sent from my T-Mobile 4G LTE device
------ Original message------ From: Alek Petkovic Date: Thu, Nov 28, 2019 10:27 PM Cc: cturnertuning;Carl; Subject:Re: [ham-amplifiers] 3CX3000F7 10-80m
Ratings are guidelines.
73, Alek
VK6APK
On 29/11/2019 10:14 AM, cturnertuning wrote:
Not really. Its rated at 4kv max and 1.5 amp peak. It
is the weak link for sure. But if it works it works. Better have a
glitch. One arc and its done. In this example its a fuse.:)
Sent from my T-Mobile 4G
LTE device
The Ameritron choke will easily
handle 2A?from that tube on CW and SSB.
It is also well placed for minimum
coupling.
?
Carl
-----
Original Message -----
To:
[email protected]
Sent:
Wednesday, November 27, 2019 10:40 AM
Re: [ham-amplifiers] 3CX3000F7 10-80m
That little Ameritron plate choke is screaming for its life :)
Very cool amplifier!
On 11/26/2019 6:53 PM, Mike via wrote:
My latest amplifier.  
--
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Ratings are guidelines.
73, Alek
VK6APK
On 29/11/2019 10:14 AM, cturnertuning wrote:
Not really. Its rated at 4kv max and 1.5 amp peak. It
is the weak link for sure. But if it works it works. Better have a
glitch. One arc and its done. In this example its a fuse.:)
Sent from my T-Mobile 4G
LTE device
The Ameritron choke will easily
handle 2A?from that tube on CW and SSB.
It is also well placed for minimum
coupling.
?
Carl
-----
Original Message -----
Sent:
Wednesday, November 27, 2019 10:40 AM
Subject:
Re: [ham-amplifiers] 3CX3000F7 10-80m
That little Ameritron plate choke is screaming for its life :)
Very cool amplifier!
On 11/26/2019 6:53 PM, Mike via wrote:
My latest amplifier.  
--
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Not really. Its rated at 4kv max and 1.5 amp peak. It is the weak link for sure. But if it works it works. Better have a glitch. One arc and its done. In this example its a fuse.:)
Sent from my T-Mobile 4G LTE device
------ Original message------ From: Carl Date: Thu, Nov 28, 2019 6:25 PM Cc: Subject:Re: [ham-amplifiers] 3CX3000F7 10-80m
The Ameritron choke will easily handle 2A?from
that tube on CW and SSB.
It is also well placed for minimum
coupling.
?
Carl
----- Original Message -----
Sent: Wednesday, November 27, 2019 10:40
AM
Subject: Re: [ham-amplifiers] 3CX3000F7
10-80m
That little Ameritron plate choke is screaming for its life :) Very cool
amplifier!
On 11/26/2019 6:53 PM, Mike via
wrote:
My
latest amplifier.   --
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898
|
?
Nice amp. I see very few using the F version which
is often a real bargain even NOS.
?
Carl
----- Original Message -----
Sent: Tuesday, November 26, 2019 8:53
PM
Subject: [ham-amplifiers] 3CX3000F7
10-80m
My latest amplifier.  
|
?
The Ameritron choke will easily handle 2A?from
that tube on CW and SSB.
It is also well placed for minimum
coupling.
?
Carl
----- Original Message -----
Sent: Wednesday, November 27, 2019 10:40
AM
Subject: Re: [ham-amplifiers] 3CX3000F7
10-80m
That little Ameritron plate choke is screaming for its life :) Very cool
amplifier!
On 11/26/2019 6:53 PM, Mike via Groups.Io
wrote:
My
latest amplifier.   --
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898
|
David
In terms of reliabilty there is nothing to choose
Alpha didnt advertise their "brick on key" amps for a joke - they really can do it!
Particulary if the 76 has 3 valves go for it!
Spares are getting harder to find though
There is an Alpha 76 on the G3CWI selling site as well
73 Fred
G4BWP
toggle quoted message
Show quoted text
On Wed, Nov 27, 2019 at 10:03 AM, David Perry wrote:
Hi guys. ?Ive just been subscribed to this group. ?Greetings one and all.
Q: ?Alpha 76 or FL2100B amp...which to buy. ?I have seen one of each at
reasonable prices. ?I see the 2100 has no top band (pity) and the Alpha looks
cosmetically a bit better but the 2100 is cheaper...by far.
Any advice?
73
--
David G4YVM
|
That little Ameritron plate choke is screaming for its life :)
Very cool amplifier!
On 11/26/2019 6:53 PM, Mike via
Groups.Io wrote:
My latest amplifier.  
--
Please let me quote you for your parts needs!
I offer a discount on Protunes with parts order!
Clark Turner
480-695-2898
|
Depends on what "cheaper" means.? Too many hams will cheap out at every possible opportunity, frequently to their detriment later.
You can see today that the Alpha has a much greater retained value.? It probably has better engineering.? Another consideration is the availability of replacement finals down the line.?
As a perennial contributor here used to say, "horses for courses."? Your considerations for amp purchase won't be the same as those of other hams.? If it's ONLY "cheap" -- then I have a D&A Phantom amp I'll sell for real cheap.
73 Jim N6OTQ
On Wed, Nov 27, 2019 at 4:03 AM David Perry < bumbledp@...> wrote: Hi guys.? Ive just been subscribed to this group.? Greetings one and all.
Q: ?Alpha 76 or FL2100B amp...which to buy.? I have seen one of each at reasonable prices.? I see the 2100 has no top band (pity) and the Alpha looks cosmetically a bit better but the 2100 is cheaper...by far.
Any advice?
73
--
David G4YVM
|
Hi guys. ?Ive just been subscribed to this group. ?Greetings one and all.
Q: ?Alpha 76 or FL2100B amp...which to buy. ?I have seen one of each at reasonable prices. ?I see the 2100 has no top band (pity) and the Alpha looks cosmetically a bit better but the 2100 is cheaper...by far.
Any advice?
73
--
David G4YVM
|
Fantastic
eye candy here Mike on a nicely executed 3CX3000 amp; Bravo!
?
Thanks
for sharing the pics…
?
Leigh
VK5KLT
?
My latest amplifier:
?
. ?  ?? ?
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|
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Should have? added...
I use? his? coil? program? for? loading coils
for 40m? yagis...? and? also tank? coils? for? hb amps.? Since? it? spits out
RF? resistance for a given freq,? and? knowing the exact RF? current? flowing?
through the? coil, pretty? easy? to? then? calculate the? diss in watts...in?
the? coil.?? For? tapped? tubing? coils,? like a 20m? tubing coil,? tapped? for
17,15, 12,10m....and? say on? 15M, any? heat is? localized to? the? portion? of?
the coil? being used.? I? would have? thought the? un-used portion of
the?
coil would act as a heat? sink....? it? does not !?? Unused turns? remain? at
ambient? room? temp.....? while used? turns can? be? extremely? hot? to? the?
touch.???
?
Jim??
VE7RF
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K6STI? has? an? upgraded? FREE? coil? software version? on? his? website?
below.
Coil? 3.72 is? at? the? extreme? bottom? of left? column.
Note,? by? left clicking? on the? ....AWG,? u? can? toggle? between?
AWG...and? decimal points of an inch.
It? will? handle? awg? up? to a max?? of? 0? gauge wire?? =? .3249 inch.??
Min? AWG? is? 52 AWG =? .008 inch.
In? decimal points of an? inch? mode,? it? will? handle? tubing? up to a
max of .5 inch? OD.
?
By? left? clicking? on? the ..ditto marks? below? AWG....? u? can? toggle?
coil diam,? length, lead length,? form? thickness,?? between? inches? and? mm.?
I use? his? coil? program? for? loading coils for 40m? yagis...? and? also tank? coils? for? hb amps.? Since? it? spits out RF? resistance for a given freq,? and? knowing the exact RF? current? flowing? through the? coil, pretty? easy? to? then? calculate the? diss in watts...in? the? coil.?
?
Jim?? VE7RF
?
?
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Re: Migration to Groups.Io
Once the group is migrated, all members here will automatically be members in the new group.? I would suggest that all uploads and photos be stopped until after the migration, as there would be a good chance they would be missed in the move. ? Joe – W7RKN From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Migration to Groups.Io Hello to the Brain Trust! The following group has been set up and paid for...?/g/ham-amplifiers The Auto-Migration should happen any day and as soon as that is complete I'll kill this one. A couple of people have already figured it out and signed up. As a side note, they hold you hostage by making you pay for a yearly subscription ($220.00) to use their services, which I paid. While nobody will ever be required to pay to be a member here, any donation to help offset the cost would be appreciated. 100% of the money will be used exclusively for this group and once we reach $220 I'll let everyone know. I'm dino@... on PayPal and @DinoDarling on Venmo. Thanks!? Dino - KX6D
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Hello to the Brain Trust!
The following group has been set up and paid for...?/g/ham-amplifiers
The Auto-Migration should happen any day and as soon as that is complete I'll kill this one. A couple of people have already figured it out and signed up.
As a side note, they hold you hostage by making you pay for a yearly subscription ($220.00) to use their services, which I paid. While nobody will ever be required to pay to be a member here, any donation to help offset the cost would be appreciated. 100% of the money will be used exclusively for this group and once we reach $220 I'll let everyone know. I'm dino@... on PayPal and @DinoDarling on Venmo. Thanks!?
Dino - KX6D
|
Cheap CB amps ar very useful for us HAMS
I have purchased several of the cheap solid state CB amplifiers.? These things will work anywhere from approximately 100KHz to 30+ MHz.? They are broad as a barn.? However, if you are going to use them on the HAM bands, you really should use a band pass filter.? Not using one will almost guarantee you will be transmitting on many bands at once!? I have modified several of these amps by installing a low pass filter board from a parts radios.? Most of the LPF's I have bought off EBAY will work, although some circuitry will need to be done to change the band of operation.? A simple switch on the front will work.? Maybe some simple frequency determination device would be able to automatically change the band?? I'll have to look into this down the road.? Radio control is pretty easy to do for ICOM radio's.? I am going to do this for my FT-817, once I get it working although that kind of gets away from QRP operation!
73, Clint, VE3CMQ
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Re: yahoo groups going bye-bye.
Interesting…I got all the photos! ? Joe – W7RKN ? From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: Re: [ham_amplifiers] yahoo groups going bye-bye. ?
I got all my various groups downloaded. Contact me if you want the files. It got everything except the pictures. It only gave me the ones I uploaded. That is the link I used to get my data. I also have a gmail account that I don't check much.
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Re: yahoo groups going bye-bye.
I got all my various groups downloaded. Contact me if you want the files. It got everything except the pictures. It only gave me the ones I uploaded.
That is the link I used to get my data.
kb3jqq@... I also have a gmail account that I don't check much.
On Wednesday, October 16, 2019, 11:34:43 AM EDT, jim.thom@... [ham_amplifiers] wrote:
scroll? to? very? top.? ?sad? news.? time? to? migrate to? groups.io? ?and? fast.?
Jim? ?
VE7RF?
|
Whoops. Sent to the wrong email addy. My apologies.
Stuff happens when you get in from work @ 1AM.
73
Randy
KZ4RV
On 11/18/2019 1:22 AM, Randy
randy@... [ham_amplifiers] wrote:
toggle quoted message
Show quoted text
??
Colby is going to complete the Doorn DIR reinspection
report.
I need a form to complete the Cherry DIR. Do you want me
to do it before
my Monday jobs?
PDQ probably will require another trip (maybe not). No
water was on the
reportedly wet tiles in the hall near the closet and
bathrooms, but some
water does show up there when I wetted the kitchen walls.
The mgr. that
was there is the main one for that restaurant and I
instructed him to
tell his other managers to note when/if the water shows
up-- some
caulking was recently done in the kitchen, which may have
solved
some/most/all of the problem. I will call Mike to discuss.
Let me know
whether/how much to charge at this point.
RV
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Re: Question about HV transformer
Thanks Lou. I did a search based on component ID's, and found it was a
LPA-2 amplifier, from TMC. Two 8163 triodes.
Unfortunately, the manual lacks the schematic, but the power supply is
quite similar to LPA-1KC model (TMC also).
Many thanks
Regards
Guillermo - LU5WE.
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Show quoted text
El 18/11/19 a las 18:31, Gudguyham@... [ham_amplifiers] escribió: ?
Sounds to me you would get around 3300 volts DC after a doubler
rectifier. ?The .3A is probably a CCS rating so at ICAS that’s probably
good for .6 amp. ?In an amplifier running two 3-400 tubes that would be
an input power of about 1980 watts and probably 1100-1200 SSB would be
my guess. ?Lou
Sent from AOL Mobile Mail
Get the new AOL app: mail.mobile.aol.com <>
On?Monday, November 18, 2019,?GGLL guiye8@...
[ham_amplifiers]?<ham_amplifiers@...>?wrote:
?
GA, I took out the HV transformer (from an old commercial PA, burnt
beyond practical repair, which I guess was for twin triodes 3-400z
style, at least based in the sockets used and the filament transformer
which is a 10 VAC CT, 15A one).
This HV transformer has two primaries (115 VAC each, 50-60 Hz), and one
secondary which states 1200 VAC, 0.3 A DC Doubler
How should I estimate the transformer ratings, in terms of power
capabilities?, I don't understand the meaning of that stated current
value.
TIA
Regards
Guillermo - LU5WE.
|
Leigh Turner
Mike
Scott, KB3JQQ