Avro_Arrow
MOT: Soundwerx Designs
- Joined
- Apr 8, 2010
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Edit: Deleted
This is my somewhat modified Bravo...
The schematic is similar to this except the Bravo uses
an LM317 current source instead of the Q2 arrangement.
Edit: Had I know this would start a new page I would have used "Quote"
This is in response to the previous post...
Given the very low currents and voltages involved IMO its very difficult to extract a useful operatng point from the 12AU7 datasheet. So I would say yes: measuring the voltage drop across the plate resistors is a good starting pointIf, that is, you like how your amp sounds at its current operating point. If I recall correctly, a 12AU7 build with the default components should be pushing ~0.7mA per tube (0.35 mA per triode)
Another alternative is to simply choose a nice round number, say 1mA, and go for that, which is what I did with my build.
Good luck!
Hello everyone, I am wanting to make this amp. I am wanting to make the MSSH to drive my Sennheiser HD595s as they lack power and definition when directly hooked up to my computer. I know these are not the best audiophile cans but they were the best I could afford at the time.
Anyway, I have been unable to find the_equalizer's version of this amp and the BOM for it. I was planning on making it with the 12AX7, any advice on that would be hanndy if these are the right tubes to use. Also, what is the best way to go about making the amp, should I use some sort of strip board or just solder everything together. I am a novice when it comes to actually building from the ground up electronics.
So, any help with this would be greatly appreciated! Thanks!
I take it you've found the circuit diagram for this version (if not it's here http://diyforums.org/SSMH/SSMHvariants.php along with a bit of information valid for all the variants) as far as I'm aware I haven't come across a BoM for this version however this amp requires very few components and if you read everything of the diagram then you should have everything. With regards to building it, there is a good stripboard design thread around that couple of people have reported success with. I started with stripboard but ended up with point to point over a ground plane as I feel it's better for this particular amp, due to its noise catching properties. IIRC the HD595s are not overly power hungry, you may not need the extra gain that the AXs provide over the AUs then. Well they use exactly the same build, so you can always try rolling them.