For sale...New GI-46B 6 meter amplifier..

VK3ZL Amplifiers
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VK3ZL
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For sale...New GI-46B 6 meter amplifier..

Post by VK3ZL » Mon Apr 22, 2013 9:20 pm

I have just completed a new GI-46B 6 meter amplifier..I have been interested in trying out a single GI-46B tube amplifier for some time and built this as a prototype..The finished result is a legal limit amplifier with some comfortable overhead..This would suit anyone who wants an amplifier that will run the VK legal power limit, easy to operate and reliable, definitely not a flogger ..

The amplifier has easy access to all circuits, with a fold down front panel...I have used the reliable W4ZT bias board and Plate idle current is adjustable from the front panel..

The amplifier tunes and loads smoothly..I use a Pi-L tank on the output side....The drive input is through a tunable T network which gives a flat 1-1 vswr..Plate and grid current are metered...The amplifier can be remote switched from an exciter as long as a sequencer is used...Hot switching an amplifier soon erodes relay contacts.. Amplifier cooling uses a 240 volt fan providing air into the sealed top RF deck, air exiting through the tube cooler and a Teflon chimney on the top cover..The cathode compartment is sealed with a 240 volt fan blowing air directly on the tube filament and cathode air exiting through vents on the bottom side of the amplifier....Using my infra red thermometer focused on the tube anode cooler when running long carriers the core heats up to around 85C..Air flow is sufficient to keep the tube well within a safe operating margin...Fan noise is quite low as the fan is buried in the HT supply compartment..

I have used an 850va Toroidal transformer into a voltage doubler rectifier stack and an HT step start relay/resistor circuit...The relays and bias cutoff switching operate from a simple 24 volt power supply..Amplifier function details are clearly lettered on the front panel..Amplifier dimensions are 18x17.5x 8 inches high with turned aluminum legs 2 inches..

I have run the amplifier in a long testing session into a Bird 500 watt dummy load and everything operates smoothly..I still have it set up on the test bench and regularly run it for 10 minutes or so from cold to make sure it is reliable...I will provide circuits and operating instructions for the amplifier....New tubes are readily available from RadioKomponent in Ukraine at reasonable cost as well as various other sources ..

As written above this amplifier is for those who want a reliable 6 meter amplifier that coasts at out legal limit..Anyone interested can phone me or email for full details..We can discuss price and shipping, this amplifier is under $1k and negotiable....73..Bob..VK3ZL..
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YU7EF
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Re: For sale...New GI-46B 6 meter amplifier..

Post by YU7EF » Mon Apr 22, 2013 10:59 pm

Very neat and almost professional looking, good job Bob .... 8)

Pop, YU7EF

VK3ZL
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK3ZL » Sat Apr 27, 2013 7:39 pm

Thanks for the enquiries...Price is $780 plus shipping...A bargain..

Bob..VK3ZL..

VK3ZL
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK3ZL » Sun May 05, 2013 6:41 pm

Now listed on ebay item number 161020428417..Thanks for emails and queries...

73..Bob..VK3ZL..

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VK4GHZ
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK4GHZ » Sun May 05, 2013 6:58 pm

I had the opportunity to see one of Bob's amplifiers, when it was in Brisbane recently.

Tell me tell you this - the photos do not do them justice.
(Being a professional photographer, I regret not having my kit with me at the time, to take some pictures.)

The workmanship is excellent.
Adam, Brisbane
http://vk4ghz.com | VK4GHZ on Youtube

10 things that happen when you stop checking Facebook constantly: http://tiny.cc/t5h7cz

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VK6OX
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK6OX » Sun May 05, 2013 7:14 pm

I can also vouch for Bob's workmanship! I have one of his 6m amps! :D
Not only do they look good...they work even better! 8)
73
Andy VK6OX

If you can't explain it simply, you don't understand it well enough. Albert Einstein

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VK3WE
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK3WE » Sun May 05, 2013 7:24 pm

Thumbs up here too!

I have two of em, all good :D :D

VK3ZL
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK3ZL » Tue May 07, 2013 5:25 pm

Thanks all inquiries...This amplifier is sold..

73..Bob..VK3ZL..

VK3ZL
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Re: For sale...New GI-46B 6 meter amplifier..

Post by VK3ZL » Tue May 07, 2013 7:16 pm

Hi all, I am now building another 2 meter amplifier, probably using a 35B...If anybody is interested let me know...

Bob..VK3ZL..

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