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-   -   Simpelstark+ ODNF amplifier boards GB (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb.html)

outtek 5th September 2019 11:31 AM

Hi, order placed . Thanks FLORIN.

vzaichenko 5th September 2019 11:36 AM

Quote:

Originally Posted by outtek (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5906046.html#post5906046)
Hi, order placed . Thanks FLORIN.

Yep - we see it, thank you Florin :up:

manniraj 6th September 2019 01:17 AM

@cl00sed placed an order for 3 pairs of boards and the same quantity of jfets including mine and one more member in the forum.

thanks

tuyen 6th September 2019 01:55 AM

Is there a way to change the gain on these modules?

vzaichenko 6th September 2019 06:25 AM

Quote:

Originally Posted by tuyen (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5906713.html#post5906713)
Is there a way to change the gain on these modules?

Hi Tuyen,

Yes, what kind of gain value are you looking for?

tuyen 6th September 2019 06:40 AM

Quote:

Originally Posted by vzaichenko (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5906845.html#post5906845)
Hi Tuyen,

Yes, what kind of gain value are you looking for?

Perhaps something around 15-20db? I have vhex+ amp (Greg's unit), it sounds great, but on my high efficiency horn setup, its got too much gain for my system (29db?) My Pass F5 with 15db gain is dead quiet.

vzaichenko 6th September 2019 10:16 AM

Quote:

Originally Posted by tuyen (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5906853.html#post5906853)
Perhaps something around 15-20db? I have vhex+ amp (Greg's unit), it sounds great, but on my high efficiency horn setup, its got too much gain for my system (29db?) My Pass F5 with 15db gain is dead quiet.

OK, 29db is a somewhat "de facto" THX standard gain for the home systems, that's why we normally use it. It's easy to set 15db gain in VHex+ just replacing the feedback resistor from 27K to 5.1K (the amplifier will remain stable).

Simpelstark is a different story - I will come back to you after the weekend.

9db in voltage gain means roughly 5 times, meaning 25 times less power...
That means if I listen to my system at around 50W, you get around the same volume perception at 2W. Is the horn setup THAT efficient? :eek:

markus22ch 6th September 2019 10:39 AM

Hi

the new version of the balanced input board looks great! just placed an order in the shop.

Thanks
Markus

jwilhelm 6th September 2019 10:55 AM

Efficient horns can run on a couple watts very well. My Klipsch are 102 or 105db /W (Depending on which spec sheet you look at) so a couple watts can be quite loud. My system is dead silent with any amplifier connected to it though, including my VHex+ at standard 29dB gain. It might be worth investigating the source of the noise before altering other equipment to mask the problem. This can be very tough to do though.

jwilhelm 6th September 2019 11:08 AM

Boards just finished manufacturing. I should see them early next week. A couple of the designs have been altered from previous designs so I'll assemble a set of everything and test before shipping out (Good excuse to build my amp internals). If all is well everything should ship out late next week.


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