Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: gtrbryan on October 08, 2012, 09:37:45 pm

Title: headphone line out on a tube amp
Post by: gtrbryan on October 08, 2012, 09:37:45 pm

I would love to play through headphones with a tube amp.  What is the trick to doimg this.   I would guess there is a dummy load,  i have heard about a speaker simulators.  If any group has an idea it  will.be this one.  Get the best info here.  Thoughts.?  SCHEMATICS.

Title: Re: headphone line out on a tube amp
Post by: PRR on October 08, 2012, 10:42:58 pm

Dummy load a MUST. And an attenuator so you are not sending whole WATTS to a milliwatt headphone.

Title: Re: headphone line out on a tube amp
Post by: spacelabstudio on October 09, 2012, 09:32:56 am

I know it's not as fun as building, but I actually have one of these that I haven't used in a while and should probably sell:

https://taweber.powweb.com/weber/hpa50.htm (https://taweber.powweb.com/weber/hpa50.htm)

You could turn it into a science project, I guess, by reverse engineering it.  From what I remember there's a big wirewound rheostat and a pot in there.  I don't remember which is the headphone and which is the line out. 

Title: Re: headphone line out on a tube amp
Post by: kagliostro on October 09, 2012, 09:59:05 am

May be this can help

K

Title: Re: headphone line out on a tube amp
Post by: Dave on October 10, 2012, 05:39:11 pm

One way to avoid having to use a dummy load is to break the signal connection to the phase inverter and reroute to a headphone circuit upon plugging in the headphones.

That way, your power amp is still running, its just amplifying silence while your signal is routed to a head phone amp.

That is the way I have seen it done in Booger amps.

Dave

Title: Re: headphone line out on a tube amp
Post by: alerich on October 10, 2012, 05:57:37 pm

I don't know what wattage your amp is but this is the way Marshall did it in a little Studio 15 18 watt 2x6V6 amp I used to own. I never tried it with headphones but the level was way down. It sounded decent when plugging the speaker into it for late night practice. I really liked the idea of having a load on the OT in case you forgot to plug in a speaker.