carlosfm said:
Carlos,
I am afraid I am a newbie to audio as well. Probably I am wrong, but I think the best-pre is no-pre at all. Could you share your experience or your view on this? ( of course, a good pre is costly. 🙂 )
Should the ESP's
High Quality Audio Preamp (Mk II) considered as a good pre *in your experience)?
>>
I just found two 221R here. So, likely try 4.75K and 221R (all 1/4W 1% MF) soon.
nina said:
The best pre is a good pre.
A pot in front of a bipolar (power) op-amp, which will also have to work at high gains is not ideal.
My advice for now is: start with a simple implementation, with no pre.
Don't disperse your effords for now, concentrate (and start) on a simple amp.
nina said:
No.
And not with those PCBs.
To nina : Reproduction with realy good designed preamp is better than by most of cases by direct connected CD player, 'cos most of them have not so good made regulated output. I hope, that in this point Carlos will agree with me. 😉
Upupa Epops said:
Yes.
And even if the lowsy CDP output stages are improved and lowered the output impedance, it is driving a cable before getting to the volume pot.
Then the pot has to drive another cable.
"Passive" preamps?
No, thanks.
Dynamics always suffer.
And I see designs with 250k~1M volume pots.
carlosfm said:
And I see designs with 250k~1M volume pots.
That's good to control the lights of my living room
😀 
Carlos,
With respect to your designs and all of your contribution so far, one thing came up to my mind and really make me curious. Just wonder if this low-value-amp-with-snubeerized-ps is in the Krell league, why it seems NOT many people try this version out ? Do I miss or overlook something from my so-little technical knowledge ?
With respect, but sorry for asking but I am really curious.
Thanks,
With respect to your designs and all of your contribution so far, one thing came up to my mind and really make me curious. Just wonder if this low-value-amp-with-snubeerized-ps is in the Krell league, why it seems NOT many people try this version out ? Do I miss or overlook something from my so-little technical knowledge ?
With respect, but sorry for asking but I am really curious.
Thanks,
Explanation can be easy, maybe Krell isn't " State of Art " in amp world ( although many people think, that is ) 😎 .
Be prepared for a shock
That beats me, I don't know why don't people try such a simple design.
"Krell league" is an expression, don't take it literally.
I know Krell amps for long, I even had a Krell integrated at home, which I tweaked and improved a lot.
But even tweaked, the integrated Krell was not as transparent as my pre+power amps.
Dynamics and bass slam of my setup, with my Epos speakers, was on the same league as the Krell, but everything else was much better.
Then I connected my (DIY) pre to the Krell and things improved, as expected.
The Krell was good as a power amp, but as an integrated amp on the whole it was nothing special.
I wouldn't change my LM3886 power amp + pre for the Krell, if you ask me.
Even as a power amp, my LM3886 is more detailed.
Either with the "new" (snubberized) regulated or unregulated PSUs it is in a league of it's own.
If the Krell was mine I would sell it instead and make some money, because some audiophiles like them a lot.
Another thing, Nina: I would't loose my time with these chips if they didn't have the potential to make a very good amp.
Or course not.😉
nina said:
That beats me, I don't know why don't people try such a simple design.
"Krell league" is an expression, don't take it literally.
I know Krell amps for long, I even had a Krell integrated at home, which I tweaked and improved a lot.
But even tweaked, the integrated Krell was not as transparent as my pre+power amps.
Dynamics and bass slam of my setup, with my Epos speakers, was on the same league as the Krell, but everything else was much better.
Then I connected my (DIY) pre to the Krell and things improved, as expected.
The Krell was good as a power amp, but as an integrated amp on the whole it was nothing special.
I wouldn't change my LM3886 power amp + pre for the Krell, if you ask me.
Even as a power amp, my LM3886 is more detailed.
Either with the "new" (snubberized) regulated or unregulated PSUs it is in a league of it's own.
If the Krell was mine I would sell it instead and make some money, because some audiophiles like them a lot.
Another thing, Nina: I would't loose my time with these chips if they didn't have the potential to make a very good amp.
Upupa Epops said:
Or course not.😉
Re: Be prepared for a shock
Carlos,
What's your diy pre- you using (May I ask)?
I don't have Krell before but surely will try your design (with 4.75 / 220 res) soon. My next project is unbalanced-zen pre- 🙂
Thanks a lot for your clarification.
carlosfm said:
Carlos,
What's your diy pre- you using (May I ask)?
I don't have Krell before but surely will try your design (with 4.75 / 220 res) soon. My next project is unbalanced-zen pre- 🙂
Thanks a lot for your clarification.
To nina : Use TPA 6120 or, as Carlos say, AD 815. Both are much more better than some one transistor miracle 😉 .
carlosfm said:
Are you
Yes 😎
But I am making a bridged version based on your 3th version LM3886 schematic 😉
Are you connecting the heatsink to V- ?