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 Homebrew 10m Linear Amplifiers.

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MM0IMC
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Call Sign : 108-CT-226 / MM0IMC
Posts : 88
Times Thanked : 2
Join date : 2023-03-10
QTH or Location : Ayrshire
Equipment Used : Amstrad 901 Sidebander

Homebrew 10m Linear Amplifiers.  Empty
PostSubject: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeFri 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. Homebrew 10m Linear Amplifiers.  20220711

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weealan
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weealan


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

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PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeFri 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
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Call Sign : 108-CT-226 / MM0IMC
Posts : 88
Times Thanked : 2
Join date : 2023-03-10
QTH or Location : Ayrshire
Equipment Used : Amstrad 901 Sidebander

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PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeFri 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.

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Victor
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Victor


Call Sign : 26-CT-3228 / M7VIC
Posts : 5831
Times Thanked : 355
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeSat Mar 11, 2023 8:48 am

Nice work there Ian. Well done! Homebrew 10m Linear Amplifiers.  1f44d

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MM0IMC
Contributor
Contributor



Call Sign : 108-CT-226 / MM0IMC
Posts : 88
Times Thanked : 2
Join date : 2023-03-10
QTH or Location : Ayrshire
Equipment Used : Amstrad 901 Sidebander

Homebrew 10m Linear Amplifiers.  Empty
PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeSat Mar 11, 2023 8:54 am

Victor wrote:
Nice work there Ian. Well done! Homebrew 10m Linear Amplifiers.  1f44d
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.

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Victor
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Call Sign : 26-CT-3228 / M7VIC
Posts : 5831
Times Thanked : 355
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

Homebrew 10m Linear Amplifiers.  Empty
PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeSat 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. Wink )


All the best to you,
Victor

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MM0IMC
Contributor
Contributor



Call Sign : 108-CT-226 / MM0IMC
Posts : 88
Times Thanked : 2
Join date : 2023-03-10
QTH or Location : Ayrshire
Equipment Used : Amstrad 901 Sidebander

Homebrew 10m Linear Amplifiers.  Empty
PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitimeSat 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. Wink )


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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PostSubject: Re: Homebrew 10m Linear Amplifiers.    Homebrew 10m Linear Amplifiers.  Icon_minitime

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