Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Other Topics => Topic started by: jim on September 27, 2021, 08:36:47 pm

Title: low power tube audio
Post by: jim on September 27, 2021, 08:36:47 pm

I am a ham radio operator and I am building a speaker box for a FLex radio (Software Defined Radio) that only has headphones out jack.  I can buy small cheap amp modules fromParts- Express and others that would work great  but I would like to build a small tube amp for clean audio output with 1 or 2 watts out.  The box for a 5   1/2 inch speaker would be quite deep and there is room.  I have clean 12 volts DC ready.  Is there a circuit I can use for 12 volts DC?  Thanks, Jim  WA3RYT

Title: Re: low power tube audio
Post by: shooter on September 28, 2021, 05:44:11 am

here's a start
there's also a 1/4W by PPR somewhere but it's early n my coffee calls n......KAZI-3542 (my 'ol CB #'s :)

1 watt 5E3 Deluxe & Micro 5F6-A Bassman & 1 watt Marshall (el34world.com) (https://el34world.com/Forum/index.php?topic=18481.0)

Title: Re: low power tube audio
Post by: PRR on September 28, 2021, 03:42:10 pm

A tube at 12 Volts is barely headphone power. Tubes don't make most radio programs sound better. Throw in a LM386 for a half watt which in a good speaker is plenty for a kitchen radio.