Single Ended 45 Amplifier

[korneluk]

I did not think this was possible but in a "Boy's First Book of Electronics" a schematic was provided for a one stage amplifier with only one 1h4 power tube and no driver tube or rectifier tube. Would it be possible to drive the power tubes directly from the preamp in an iPhone instead of using the driver tubes?

Th book is here:
https://worldradiohistory.com/BOOKSHELF-ARH/Technology/The-Boy's-First-Book-of-Radio-Morgan-1954.pdf

The 1H4 schenmatic is on page 176.

 

[PRR]

......in a "Boy's First Book of Electronics" a schematic was provided for a one stage amplifier with only one 1h4 power tube and no driver tube or rectifier tube......

It very clearly says it will not operate a loudspeaker directly.

This is a "tuner". It will pull a faint signal out of the air-waves and bring it up to a small audio signal, only moderately loud in sensitive magnetic headphones (not modern hi-fi headphones).