Stereo tube amp

[Leevi]

Has anyone a tip for a good stereo amp schematic that could also be used for guitar and mic.


Some specs:


- 30-50W power
- big headroom
- line In/OUT
- Microphone/Guitar inputs


/Leevi

[jjasilli]

Doug has a stereo amp in the Library Section. 


Not enough info provided.  E.g., the old fender 2 channel amps enabled a player to use a mic & an instrument through the same amp.  These amps were 2 channel but not stereo.  Also they assumed the use of hi-impedance mics, but today's mic's are usually lo-impedance, except for harp mics.


Please specify:  vocal or harp mic; electric or acoustic guitar. 

[Leevi]

Doug has a stereo amp in the Library Section. 

What brand?

Please specify:  vocal or harp mic; electric or acoustic guitar.   

The amp will be mainly used as power amp for line level signals coming from computer, mixer, players etc.


But it could also be used as a guitar amp for electric guitars. And maybe more seldom for acoustic microphones
in some events.


/Leevi

[kagliostro]

Here is the link to Doug's Stereo Amp

http://el34world.com/projects/StereoPreAmp1.htm

I doubt it can be used for mic without mod, it is a guitar amp (a good guitar amp)

K

[Jack_Hester]

Has anyone a tip for a good stereo amp schematic that could also be used for guitar and mic.


Some specs:


- 30-50W power
- big headroom
- line In/OUT
- Microphone/Guitar inputs


/Leevi

Here's a potential candidate:

http://el34world.com/charts/Schematics/files/gibson/Gibson_GA-78.pdf

A good sounding amp, but I would run the heater wires in a separate shielded harness, if building from scratch.  My 78RV has one harness with the Line In AC, heaters, and B+ all inside.  It has a hum that I'm satisfied is coming from this arrangement.  Power supply is mounted in the bottom of the cab, and the amp chassis in the top. 

I experimented with it only one time, with the volume reduced.  MP3 player into the stereo jack on the front end.  Old record player, with it's own pre-amp, to the RCA jacks.  10" speakers. 

Jack

[shooter]

I just did this build for someone looking for about what you're asking, it's a 2 channel preamp board wired to a 70Wrms SSamp.  I gained both preamp gain and tone pots so I had essentially 2 identical channels, one goes to the SS amp for the guitar, the other to a line out XLR jack, which I need to finalize but the amps 200miles away getting played.

pre is a M7C SRPP, the PA a VM100
fwiw