DIYHiFi.org

This is the second time I am reading through these posts.
I am trying to find out the finer points of this pre .
I notice that there are very few posts about the different types of capacitors and resistors and the influence it has to the final outcome.
This is my first version and would like to build a second "ultimate " version. !
At present it is unity gain and R5 is 560 R and I have removed R4.
Carlos, I hope you do not mind clearing some of my questions :
1) do I expect to hear any difference if I replace R4 with 560 R also.?
2) I am using a Lightspeed clone passive as the pot.
I try placing the Lightspeed in front or after the AD 815 and both way works fine.
My amp is the Truepath Tripath amp with a 2 uF input cap .
What is your recommendation in this ?

The other day, I tried the Ad 815 in my friends place with an expensive panel speaker and jadis monblock amp. After hearing it, everybody wants a AD 815 !
Thanks once again.
kp93300

At present it is unity gain and R5 is 560 R and I have removed R4.
Carlos, I hope you do not mind clearing some of my questions :
1) do I expect to hear any difference if I replace R4 with 560 R also.?
2) I am using a Lightspeed clone passive as the pot.
I try placing the Lightspeed in front or after the AD 815 and both way works fine.
My amp is the Truepath Tripath amp with a 2 uF input cap .
What is your recommendation in this ?

I have been informed that there's a 'group buy' thread at Pinkfish media forum.
I feel that I need to clarify some things:

- That crazy PCB design, which is based exatly on MY schematic, doesn't have my permission, nor was I consulted.
- Call it 'group buy' or whatever you want, and although the guy gives me the credit for the schematic on the PCB, I don't agree with the PCB design and I don't agree with his attitude - asking help with the PCB design and right away talking about a 'group buy'. Typical.
- Can you trust a guy with a nickname 'Hacker'?
- Am I going to loose my time with a forum that allows such behaviour? No. I don't care.

Up to now I have tried to keep this strictly in the diy field.
I knew that by posting the design it would be in the public domain, and so it is. But there's a call of attention on the schematic: for diy use only.
I have no problem at all with other people making their own PCBs and privately sending their files to others, or their boards.
All in a private basis. This has happened before and those guys were honest enough to ask me permission to do that.
There are good, honest people using my preamp, with or without changes to the original design. These guys have made the PCB for theirselves and when contacted by others have sent the files. Even so, they asked me if it was ok to do that.

As for that unauthorized 'group buy', I'm not even going to take it serious. Actually, I have more important stuff to worry about in my life than this kind of stuff.
It's in your hands. Go on and buy him the board, if you want.
You'll get the feeling of a made in china kind of copycat stuff, but hey... it's an AD815 pre. Right?

Hi carlosfm,

Just bought a number of Elna silmic II 100 uFs for bypassing some high freq LME and LT opamps.....

Often I see small value say from 0.1 F to 0.01uF are also used to bypass the bigger bypass for taking care of the very hi freq. And you suggest not to use them, right? And wouldn't that be unable to prevent any potential oscillation at the very hi freq range? Thanks for the advice!