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Old 28th February 2005, 06:37 AM   #1
mlabbee is offline mlabbee  Abu Dhabi
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Default Tube amp schematic - any thoughts?

Here's the schematic for my pencil pusher - a low power, single-ended, class A amp using 3 triode gain stages and a triode power stage. The tubes are 6021s and the B+ I estimate will come in between 215 and 250, depending on whether I use a 8VAC or 9VAC wall wart.

Any thoughts or suggestions? The breadboarded version is very noisy, especially when I crank it, but I'm assuming most of that noise will go away when I put it in a shielded enclosure and do point to point wiring with a star ground.

I will start the final build this week - I'll be putting it in an old wooden tube radio cabinet - it should wind up looking pretty cool. I'll post some pics when it's ready.
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Old 28th February 2005, 02:02 PM   #2
edl is offline edl  Hungary
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the amp gives so little power, isn't it?
about 500mW, I think. is it enough?
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Old 28th February 2005, 03:11 PM   #3
mlabbee is offline mlabbee  Abu Dhabi
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It will generate between .5 and 1 W. It's enough for a practice/recording amp - the idea is to get a high gain sound with a fairly low SPL it's an ear saver
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