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Messages - blackcorvo

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106
Tubes and Hybrids / Small Push-Pull Amplifier
« on: November 23, 2012, 12:37:49 AM »
So, I started working on a small project to put in use some tubes I had laying around.

Here's a little clip I recorded a couple days ago:
http://www.youtube.com/watch?v=vBoPgQ0By90

And here's the schematic:



The 5AQ5 is simply a 6AQ5 with a 4.7v/600mA filament. All other specs (plate dissipation, max voltages and curves) are the same.
The switch maked with "150v" and "280v" simply changes the B+, so I can get crunchy tones at lower levels (as I've shown in the video).

I am also planning on adding a second power section using a bridged TDA2005 (that would be powered by rectifying the AC from the filament secondary), for louder clean tones.
After checking the Datasheet for it, I came up with the following circuit (STILL UNTESTED) :


I would connect each input to both sides that feed the 5AQ5s grids.

The speaker would be connected to a DPDT switch, to change it from being connected to the tube PA or the SS PA. I would also have a 100R resistor connected to the OT's secondary, so that I didn't end up blowing my power tubes when switching to SS mode.

What do you guys think? I'm sorry if it sounds confusing... but I sometimes overthink a little when coming up with ideas like this one.

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