Hi quanghao, do you still use this Preamp? I tried many different tubes but the 6N6P are the best for me.
How does the sound change when you parallel the tubes?
How does the sound change when you parallel the tubes?
Yes, that is reference pre for my systum .
use 6h6, anode 150 v to 170 v, 5 -10 ma for 1/2 tube.
6h30 ,it best th choice. Thank
this is PRE 818 update, I use all Cap MKP for power supply, and use tube 6h30 DR + R2R volume control
you can buy tube in :Parts ConneXion - The authority on hi-fi DIY parts and components
you can buy tube in :Parts ConneXion - The authority on hi-fi DIY parts and components
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and new my pre update !
thank
thank
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Should this be in the commercial section, as it clearly isn't a serious DIY line stage? Just a bad circuit with expensive components to press 'audiophile' buttons.
Yes it should, and it will be shortly.
So this is part of your DIY audio hobby, not connected with your commercial audio business? If so, I am sure the mods will be happy to move it back to the DIY area.
It looks very similar to an item on the website. They even, quite coincidentally I'm sure, have the same name: 818.
My understanding is that a commercial vendor may discuss his products in the DIY area, provided he makes enough information available for anyone else to freely copy his design. Have I got that right?
My understanding is that a commercial vendor may discuss his products in the DIY area, provided he makes enough information available for anyone else to freely copy his design. Have I got that right?
Hi SY,
I look at the quanghao commercial website but I don't find this particular preamplifier kit, in fact, there seem to be no preamplifier kits at all at this moment. Of course, if he make a PCB for it, he will probably sold a kit for this preamp one of these days.
If you see a page on is website about this preamplifier, can you please give me the link ?
I am not interested to buy anything, I am just a bit curious ... Thanks !
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I think he should have this right, since he give all the necessary information to build one, nobody here have to buy is kit. Also, members of this forum can participate to the commercial development of is product, that's fun !
It is possible to be a diyer and a business man at the same time, many start their business like that, they first make projects for themselves, then for some friends having them paying the parts and finally for everybody on Internet, making a small profit for living ... 🙂
Hi DF96!
yes, it was on my website, but I have not sold any PCB!
Previously, I opened this thread in the discussion, to share, but do not understand why it was included in the trade.
In this design, you can use the schematic to make themselves a PRE, it sounds very good, but not commercial!
Thank you and hope you enjoyed it!
quanghao
yes, it was on my website, but I have not sold any PCB!
Previously, I opened this thread in the discussion, to share, but do not understand why it was included in the trade.
In this design, you can use the schematic to make themselves a PRE, it sounds very good, but not commercial!
Thank you and hope you enjoyed it!
quanghao
I have tried several times... but get error message trying to order anything from Quanghao.com
<<There is no carrier available that will deliver to this address! >>
Arne K
<<There is no carrier available that will deliver to this address! >>
Arne K
Hi quanghao,
i have some questions. At the output is used a 4,7uf Capacitor. Why are you using this large value?
The capacitorat the grids are 1k. I think its the protection for oscillation. So this value is not critical. I want to use 150 Ohm, cause i have this in stock.
with best regards
i have some questions. At the output is used a 4,7uf Capacitor. Why are you using this large value?
The capacitorat the grids are 1k. I think its the protection for oscillation. So this value is not critical. I want to use 150 Ohm, cause i have this in stock.
with best regards
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