Maybe you should stop thinking about the sound of the RevC when you post. It seems to affect the image that appears...
How about the first arrangement, but flip the RevC around and mount the 3886 to the chassis side?
How about the first arrangement, but flip the RevC around and mount the 3886 to the chassis side?
You guys are great. Thanks for the almost instant input. I am leaning toward this configuration with the transformer pushed as far from the RevC board as possible. I like keeping the board near the back of the amp to minimize signal path.
I would definitely like to see Panelhead's configuration with the amp in a cast aluminum chassis--this was actually my first choice but the Deltron cases that I received from Mouser were so rough that I returned them for refund.
The Lansing cases have a lip on the front and rear panels such that a Front Panel Express plate can be fitted in without showing the unanodized side edge. I am thinking of having a 1.5 mm FPE plate manufactured to finish off the project. This is several more steps ahead, and it is only a thought right now.
I would definitely like to see Panelhead's configuration with the amp in a cast aluminum chassis--this was actually my first choice but the Deltron cases that I received from Mouser were so rough that I returned them for refund.
The Lansing cases have a lip on the front and rear panels such that a Front Panel Express plate can be fitted in without showing the unanodized side edge. I am thinking of having a 1.5 mm FPE plate manufactured to finish off the project. This is several more steps ahead, and it is only a thought right now.
An externally hosted image should be here but it was not working when we last tested it.
![dsc01482[1][1].jpg](/community/data/attachments/77/77699-e75b97088c497e080d88b862b8ada32b.jpg?hash=51uXCIxJfg)
![dsc01482[1].jpg](/community/data/attachments/77/77707-e75b97088c497e080d88b862b8ada32b.jpg?hash=51uXCIxJfg)
bandwith
Hi, in the last few days I did several listening tests with the RefC and my class A amp. The sound is promising, but it doesn't match 100 % to my speakers (Manger Sound Transducer). Very finest details are missing and the localisation of instruments lacks a little bit. It sounds warm and all instruments seems bigger. Listening to percussion instruments over the RevC there is a little lack of attack. I guess it has to do with the limited bandwith to 70 kHz.
Has anyone expierience with raising the bandwith >=150 kHz without negative effects? Which parts to change to give it a try?
Arne
Hi, in the last few days I did several listening tests with the RefC and my class A amp. The sound is promising, but it doesn't match 100 % to my speakers (Manger Sound Transducer). Very finest details are missing and the localisation of instruments lacks a little bit. It sounds warm and all instruments seems bigger. Listening to percussion instruments over the RevC there is a little lack of attack. I guess it has to do with the limited bandwith to 70 kHz.
Has anyone expierience with raising the bandwith >=150 kHz without negative effects? Which parts to change to give it a try?
Arne
Preamp?
Like a lot of chipamps, this one really benefits from a strong linestage. What are you driving it with?
The localizations I cannot comment on, pinpoint imaging is not something I hear live, so but not strive for it at home. Muted dynamics are not usually an issue. I at one time felt that this was only average. But using a couple different linestages showed that it is actually a strength.
George
Like a lot of chipamps, this one really benefits from a strong linestage. What are you driving it with?
The localizations I cannot comment on, pinpoint imaging is not something I hear live, so but not strive for it at home. Muted dynamics are not usually an issue. I at one time felt that this was only average. But using a couple different linestages showed that it is actually a strength.
George
@Brian
I will try the RefC without an input cap. I also have some used 1 µF Audyn Plus caps left. I will try them also.
@Panelhead
I do not use an active preamplifier, use only a passive stepped attenuator. With active preamplification you get perhaps some better bass but the over all result gets worse. That is my experience with other amps. I sold my preamp a year ago, so I am not able testing a linestage with the RefC.
I will try the RefC without an input cap. I also have some used 1 µF Audyn Plus caps left. I will try them also.
@Panelhead
I do not use an active preamplifier, use only a passive stepped attenuator. With active preamplification you get perhaps some better bass but the over all result gets worse. That is my experience with other amps. I sold my preamp a year ago, so I am not able testing a linestage with the RefC.
You might try a simple one here
I suspected you had a passive. The chipamps really need an active linestage to sound their best.
This circuit is not a gainclone, but is still a chipamp.
The imaging may never improve, the dynamics and slamm should come with a good quality linestage. A good linestage will not degrade the sonics. It may actually improve them.
Try the input cap removal first. It may be all you need.
Good luck with it.
George
I suspected you had a passive. The chipamps really need an active linestage to sound their best.
This circuit is not a gainclone, but is still a chipamp.
The imaging may never improve, the dynamics and slamm should come with a good quality linestage. A good linestage will not degrade the sonics. It may actually improve them.
Try the input cap removal first. It may be all you need.
Good luck with it.
George
Hi George,
this morning I have configured my RefC to use the second input jack to bypass the input cap.
I had only a few minutes for listening, but in my opinion it is a great improvement when not using the input caps. There is still a small lack of "attack" but the overall result is much better without the caps. More sonic details are present.
Next thing to try is an active linestage. Another RefC User from a german hifi-forum has agreed to lend his PGA Pre for testing purposes. THX Serge!
I will report in a week or so if the linestage is a further improvement.
Arne
this morning I have configured my RefC to use the second input jack to bypass the input cap.
I had only a few minutes for listening, but in my opinion it is a great improvement when not using the input caps. There is still a small lack of "attack" but the overall result is much better without the caps. More sonic details are present.
Next thing to try is an active linestage. Another RefC User from a german hifi-forum has agreed to lend his PGA Pre for testing purposes. THX Serge!
I will report in a week or so if the linestage is a further improvement.
Arne
I don´t really agree with the preamp bit.I have tried both and I think the myref is one of my amps that does not really benefit from active preamplification.
A gainclone I used to have was much more needy of an active pre.
Theoretically of course a normal cd player with opamp active outputs should have absolutely no problem driving the high impedance , low capacitance inputs of the LM318.In fact I even have a DDDAC (passive I/V) driving it without problems and the bass is great.
But let your ears decide what is best for your system.
A gainclone I used to have was much more needy of an active pre.
Theoretically of course a normal cd player with opamp active outputs should have absolutely no problem driving the high impedance , low capacitance inputs of the LM318.In fact I even have a DDDAC (passive I/V) driving it without problems and the bass is great.
But let your ears decide what is best for your system.
Mauro, AFAIK, suggests that the rev "a" is the most sensitive to the impedance of the previous stage (i.e. likes a preamp), while the rev "c" is less sensitive but still benefits from a good preamp.
The baxandall preamp he proposed time ago (with the pot in the feedback network) seems a great match.
Cheers
Andrea
The baxandall preamp he proposed time ago (with the pot in the feedback network) seems a great match.
Cheers
Andrea
Hi Arne 🙂
Why don't you try one of the offers twistedpearaudio has?
I own 2 Kooka's, one of them integrated with My-ref and they match very well.
I own a transformer based passive pre and would say Kooka is as transparent and fast, has possibly better bass , but lacks TVC's undefinable "magic" (could be burn-in issue, perhaps).
Not to mention the price! 😀
The other Kooka is paired with Darwin Source selector in my 2nd system (active). I assure you bass is very good. See my new DIY speakers: 😎
I bet it's better than your own passive pre. 😉
Good luck!
M
Why don't you try one of the offers twistedpearaudio has?
I own 2 Kooka's, one of them integrated with My-ref and they match very well.
I own a transformer based passive pre and would say Kooka is as transparent and fast, has possibly better bass , but lacks TVC's undefinable "magic" (could be burn-in issue, perhaps).
Not to mention the price! 😀
The other Kooka is paired with Darwin Source selector in my 2nd system (active). I assure you bass is very good. See my new DIY speakers: 😎
I bet it's better than your own passive pre. 😉
Good luck!
M
@Protos,
In my opinion there is no need for a preamp under normal circumstances. If the impendance of the next stage ist 5 to 10 times higher then the stage before there should be no negativ effects. In my system is it 30 Ohms --> 10 K attenuator --> 100 K Amp. Im also using low capacitive cables.
@AndyPairo
Do you have a link of the baxandall preamp? When using a preamp it should be a design that does not attenuate first and
amplify in the next stage. The baxandall preamp seems similar in design as the pass aleph p.
@Maxlorenz
Your speakers have fully WAF. 😎
I believe that they sound very good.
Perhaps I will try/buy a Kooka, but first I have to do some listening tests with an active preamp.
In my opinion there is no need for a preamp under normal circumstances. If the impendance of the next stage ist 5 to 10 times higher then the stage before there should be no negativ effects. In my system is it 30 Ohms --> 10 K attenuator --> 100 K Amp. Im also using low capacitive cables.
@AndyPairo
Do you have a link of the baxandall preamp? When using a preamp it should be a design that does not attenuate first and
amplify in the next stage. The baxandall preamp seems similar in design as the pass aleph p.
@Maxlorenz
Your speakers have fully WAF. 😎
I believe that they sound very good.
Perhaps I will try/buy a Kooka, but first I have to do some listening tests with an active preamp.
1543 said:
Basically is the circuit posted here http://www.diyaudio.com/forums/showthread.php?s=&threadid=55621 without the power stage and with a 1k from NI input of the last opamp.
Cheers
Andrea
Dear 1543:
He, he, he! 😀 Touché!
I had a few problems at the beginning. Now she loves them
Best wishes.
M
He, he, he! 😀 Touché!
I had a few problems at the beginning. Now she loves them
Best wishes.
M