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Join in with the fun of the Charlie Tango DX Group Summer 10m Challenge - from April 1st 2024
Call Sign : 108-CT-226 / MM0IMC Posts : 89 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Homebrew 10m Linear Amplifiers. Fri Mar 10, 2023 5:53 pm
Here's a picture of two homebrew 10m linear amplifiers that I've built, in the last few years.
The top one is a GI-7B triode based one and the larger one is a GS-35B triode based one.
GaryWilson, Victor, Ace, weealan and Fishnut9999 like this post
weealan New Member
Call Sign : 108-CT-355 Posts : 30 Times Thanked : 5 Join date : 2023-01-23 QTH or Location : Bathgate ,,locator IO85EV Equipment Used : Yaesu FT 817
Subject: Re: Homebrew 10m Linear Amplifiers. Fri Mar 10, 2023 8:56 pm
Hi Ian,,what would be a typical build cost for the smaller one with the GI-7B tube
cheers Alan
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MM0IMC Contributor
Call Sign : 108-CT-226 / MM0IMC Posts : 89 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Homebrew 10m Linear Amplifiers. Fri Mar 10, 2023 10:38 pm
weealan wrote:
Hi Ian,,what would be a typical build cost for the smaller one with the GI-7B tube
cheers Alan
Difficult to say, as the cost of parts can go up and down. Perhaps £300-£400, as many of the parts can be gotten from eBay. The main transformer is a salvaged microwave oven transformer, with the magnetic shunts removed.
weealan likes this post
Victor CT Directors
Call Sign : 26-CT-3228 / M7VIC Posts : 5862 Times Thanked : 360 Join date : 2019-11-10 QTH or Location : Bedford Equipment Used : Various
Subject: Re: Homebrew 10m Linear Amplifiers. Sat Mar 11, 2023 8:48 am
Nice work there Ian. Well done!
MM0IMC likes this post
MM0IMC Contributor
Call Sign : 108-CT-226 / MM0IMC Posts : 89 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Homebrew 10m Linear Amplifiers. Sat Mar 11, 2023 8:54 am
Victor wrote:
Nice work there Ian. Well done!
I'm building a third one for a friend, then downing tools forever... It'll be similar to the GI-7B build, but with a GI-46B triode instead.
Victor likes this post
Victor CT Directors
Call Sign : 26-CT-3228 / M7VIC Posts : 5862 Times Thanked : 360 Join date : 2019-11-10 QTH or Location : Bedford Equipment Used : Various
Subject: Re: Homebrew 10m Linear Amplifiers. Sat Mar 11, 2023 9:05 am
That's a shame Ian as you obviously know what you're doing. (Anode voltages alone are enough to scare off most!)
I do enjoy a good bit of homebrew and thermionic valves hold a fondness but it's all a lot more difficult nowadays with silly prices asked for even the most basic of parts. I hope your skills can still serve you well with other projects as it's always good to keep a hand & mind in such things.
(My once dextrous hands are reduced to 'bear paws' nowadays and I'm slowly going blind as a bat! Still got the tenacity to keep trying things though. )
All the best to you, Victor
MM0IMC likes this post
MM0IMC Contributor
Call Sign : 108-CT-226 / MM0IMC Posts : 89 Times Thanked : 2 Join date : 2023-03-10 QTH or Location : Ayrshire Equipment Used : Amstrad 901 Sidebander
Subject: Re: Homebrew 10m Linear Amplifiers. Sat Mar 11, 2023 9:47 am
Victor wrote:
That's a shame Ian as you obviously know what you're doing. (Anode voltages alone are enough to scare off most!)
I do enjoy a good bit of homebrew and thermionic valves hold a fondness but it's all a lot more difficult nowadays with silly prices asked for even the most basic of parts. I hope your skills can still serve you well with other projects as it's always good to keep a hand & mind in such things.
(My once dextrous hands are reduced to 'bear paws' nowadays and I'm slowly going blind as a bat! Still got the tenacity to keep trying things though. )
All the best to you, Victor
Prices are getting silly and parts are getting harder to come by, especially suitable air spaced variable capacitors for tune and load of the tank circuit.
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Subject: Homebrew 10m Linear Amplifiers. 
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