Dynahi?

[jp11801]

my dynahi was single ended with only one of the rcas wired up , they are probably the best used amp value out there

[Pars]

Originally Posted by luvdunhill

just curious, are there any significant changes / improvements to the design? I have a set of boards and all the required parts, including transformer. I was sorta thinking about it as a preamp, but I would like to know its max voltage output, as I would use it into a Pass F4 current buffer and need lots of voltage swing.

I'm not sure how this would work as a preamp... seems somewhat massive overkill from a power perspective.

Have you ever looked at something like the Pass Aleph P1.7 on diyaudio? The boards aren't available anymore, but the layout was pretty easy on them...

As Nate mentioned, I would be really tempted on the Dynahi to use the sigma22 PSU(s) instead of the original, as blowing up $20 OPA541s isn't real enticing to me, even though I have the boards.

[luvdunhill]

well, since my amp would provide no voltage gain, absurdity is merited. Aleph doesn't have enough voltage gain (I'll go hunt for what I need)

edit:

according to Papa: "...which is about 16-20 dB (gain) and +/-20V (swing) per input leg"

the amp can handle a +/-40V unclipped output in balanced mono (as it's called in the docs)

[justin]

Originally Posted by luvdunhill

just curious, are there any significant changes / improvements to the design? I have a set of boards and all the required parts, including transformer. I was sorta thinking about it as a preamp, but I would like to know its max voltage output, as I would use it into a Pass F4 current buffer and need lots of voltage swing.

there's no reason to use it as a pre-amp. it's the same design as the dynalo, but with higher power output transistors, and cascoded input stage which is required due to the 60V of power supply. just more noise and a slightly more complex design.

[luvdunhill]

Originally Posted by luvdunhill

well, since my amp would provide no voltage gain, absurdity is merited. Aleph doesn't have enough voltage gain (I'll go hunt for what I need)

edit:

according to Papa: "...which is about 16-20 dB (gain) and +/-20V (swing) per input leg"

the amp can handle a +/-40V unclipped output in balanced mono (as it's called in the docs)

heh. I think the replies to this thread got lost at some point. Anyways, I'm still looking for a preamp project that can handle the above. I think the preamp I posted here:

Preamps!

is probably the most accessible project out there. I agree with Kevin's comments but don't really know of a good project off hand that will address his design concerns and get me the specs I need.

So, last call for projects!