Let's see you make one with tubes

[WA4SWJ]

Guys,

Interesting idea, but no tubes in the current implementation. We might need an additional suitcase for the batteries.

http://www.maximintegrated.com/app-note ... vp/id/5633

Regards,

[Fiddler]

No problem about the batteries - just build a horn inside an old steamer trunk and store the batteries inside. Since those trunks had wheels so no need to shoulder the burden either.