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Old 20th Nov 2020, 11:41 am   #1
lloydwells
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Default Circuit wanted for 1920s style Battery powered Amplifier

Right I have a very nice two valve radio from 1925 I want to build a seperate amplifier for it using 2v battery valves anyone built anything like this or in possession of an original design for one ??
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Old 20th Nov 2020, 12:16 pm   #2
GrimJosef
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

It's claimed that although push-pull was known about by this stage, the first commercial PP radio amp only appeared in 1924 https://en.wikipedia.org/wiki/Push%E2%80%93pull_output. A more primitive single-ended amp is detailed in this series of Godfrey Phillips cigarette cards, including all the instructions for building one http://www.r-type.org/articles/art-028.htm. I like the way that the two cards which cover the subject of the valve more or less boil down to saying "Get a valve" .

Cheers,

GJ
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Old 20th Nov 2020, 12:48 pm   #3
peter_scott
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

You could just build the AF parts of a WW project like this.

Peter
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Old 22nd Nov 2020, 12:27 pm   #4
astral highway
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

There are pages and pages of ads first, but if you scroll down to the 12th page, that’s where the circuit diagram is. It is marked in the upper left hand corner as (page) 3.
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Old Yesterday, 9:46 pm   #5
lloydwells
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

I'd quite like to make a push pull amp struggling to find a.schematic for push pull using directly heated battery Triodes though.
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Old Yesterday, 10:15 pm   #6
Ed_Dinning
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

Hi lloyd, have a look at QPP circuits. They use a single valve with 2 electrode assemblies inside

Ed
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Old Yesterday, 10:18 pm   #7
peter_scott
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Default Re: Circuit wanted for 1920s style Battery powered Amplifier

How about these?
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