Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TerryD on October 29, 2025, 11:37:57 am

Title: PHILCO SA-1005 TUBE AMP
Post by: TerryD on October 29, 2025, 11:37:57 am

I want to add speakers to my Roland HP 704 digital piano.  Could I use this to plug into for stereo output.  I see one wire for input and nothing for output.  Could I add them?  this would warm things up nice, way better than crap digital monitors.  Thanks

Title: Re: PHILCO SA-1005 TUBE AMP
Post by: passaloutre on October 29, 2025, 12:50:23 pm

Looks like it outputs to its built-in speakers. If I understand you correctly, you'd have to open it up and find a way to wire the output transformer to a speaker jack. Or are you trying to use the built-in speakers?

It also might not have enough gain, depending on the signal strength of your keyboard.