George, I’m not quite sure what you mean here? Are you saying that all other op-amps one may try on the PCB should get the 5pF across 2&6 but opa827 should have been left untouched?
Thanks
Pete
Ok, I understand what You mean. I have to look up the 627. I had been listening to it without, and it worked. But will search back. With that chip, I had spent less time, on the long run.
The other three, present candidates we have more diffused experience.
We talked about the 827 / 828.
ADA4627 - it was one of the first. I had started out without pin2-pin6 local feedback, but then, on the long run it turned out to be unstable, in certain builds. So now I suggest to use that 5pF feedback cap.
Ciao, George
The other three, present candidates we have more diffused experience.
We talked about the 827 / 828.
ADA4627 - it was one of the first. I had started out without pin2-pin6 local feedback, but then, on the long run it turned out to be unstable, in certain builds. So now I suggest to use that 5pF feedback cap.
Ciao, George
It will work but in case of failure you could have 36V there, Penasa specs were for a 50V cap.
Apart that a 25V cap usually sound worse than a 50V one.
Sure but together with PKs suggestion there were a warning about inadequate voltage rating.
With PKs the risk is balanced with excellent sound, in 25V KZ case not so much... 😉
Everything will be fine...
Dear friends, life is testing us right now. Here in Italy it is now clear that only other months of isolation of the population in their homes will save us. It will be tough, but everything will be fine ...
I live in Rome in a large apartment building, more than a thousand tenants overlooking a courtyard. The last person I met at my house was George, who came to see me along with his amps.
For some evenings, at dinner time, I open the window of my small music room and play a piece of music at very high volume. People, from their windows, liked and also applauded. I felt a deep emotion ...
Needless to tell you which amp!
My good FE is giving me great satisfaction, good boy! He too managed to make himself useful at the time of Covid-19. (Thank you Dario, resist, I embrace you)
Tonight I will use the amplifier that George left me. (George, don't get mad, it's for a good purpose!)
Who knows which of the two my neighbors will prefer ...
I love you
Ciao
Giacinto
Dear friends, life is testing us right now. Here in Italy it is now clear that only other months of isolation of the population in their homes will save us. It will be tough, but everything will be fine ...
I live in Rome in a large apartment building, more than a thousand tenants overlooking a courtyard. The last person I met at my house was George, who came to see me along with his amps.
For some evenings, at dinner time, I open the window of my small music room and play a piece of music at very high volume. People, from their windows, liked and also applauded. I felt a deep emotion ...
Needless to tell you which amp!
My good FE is giving me great satisfaction, good boy! He too managed to make himself useful at the time of Covid-19. (Thank you Dario, resist, I embrace you)
Tonight I will use the amplifier that George left me. (George, don't get mad, it's for a good purpose!)
Who knows which of the two my neighbors will prefer ...
I love you
Ciao
Giacinto
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Giacinto,
First, Stay safe. I too am listening to even more music and working on audio projects to keep busy. But if you show nice pictures like that, you will have to say more about what is in them.
I recognize the picture of your FE with George's test board. His test board always looked better than my mess. The speakers look very nice and, of course, DIY. I recognize the Metrum Amythst which you mentioned earlier.
<As an aside, I don't know if you heard, but Metrum is gone. They had a bankruptcy in February. Cees, the brains of Metrum has been bought out more than 1 year ago and now makes DACs as Sonett Digital Audio. I have 3 Metrum DACs, so I have been paying attention.>
I am most curious about the turntables. The one on the left looks like it might be a Denon direct drive? The right one?
Jac
First, Stay safe. I too am listening to even more music and working on audio projects to keep busy. But if you show nice pictures like that, you will have to say more about what is in them.
I recognize the picture of your FE with George's test board. His test board always looked better than my mess. The speakers look very nice and, of course, DIY. I recognize the Metrum Amythst which you mentioned earlier.
<As an aside, I don't know if you heard, but Metrum is gone. They had a bankruptcy in February. Cees, the brains of Metrum has been bought out more than 1 year ago and now makes DACs as Sonett Digital Audio. I have 3 Metrum DACs, so I have been paying attention.>
I am most curious about the turntables. The one on the left looks like it might be a Denon direct drive? The right one?
Jac
I agree, of course. What surprises me is how many companies are selling DC coupled amps, all components really, with no protection at all. Especially as a DIY project, I think protection is smart and adequate sizing of components is part of that. I am just a little surprised by the trend.
Jac
Bankruptcy All Engineering B.V. in Eindhoven (F.16/20/77) - FaillissementsDossier.nl
I did not believe it. I found this document of the company's bankruptcy. Cees' exit appears to be linked to the acquisition of the Italian M2Tech by All Engineering BV. This operation, about a year ago, seemed strategic in the acquisition of different conversion technology and knowledge of the USB interface and winning compared to the markets. Strange world ...
Ciao
The direct drive on the left is a Pioneer PL600x. It is perhaps not as fascinating as others, but it has a lot of concreteness. Motor and arm of excellent quality. Suspended frame very effective. Fully automatic, smooth movements, very comfortable to use. With this turntable you put records after records as in teenager afternoons. Play with a Denon DL110.
On the right is my "Frankenthorens". It is a Thorens TD321, replaced the lower cover in very resonant steel with a small anti-resonant plinth (dampened with lead inserts). Graphite, marble and rubber form the basis. Replaced mat: lead + leather. Replaced wall tranformer: toroidal + emi/rf filter. The arm is an Audiomods Classic II. Play with a Goldring 1042.
Both of them really like My_Ref FE. And I apologize for going off topic
Ciao
Giacinto
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A glimmer of hope
It can be a very hard, cold world. Putting something together that brings pleasure to others and yourself can help.
We have just started the lockdowns in the US. California only today. New York will be soon. Washington state too
Glad warm weather is already here. In 80’s now, so 28C. Supposed to help.
Stay active, physically and mentally.
It can be a very hard, cold world. Putting something together that brings pleasure to others and yourself can help.
We have just started the lockdowns in the US. California only today. New York will be soon. Washington state too
Glad warm weather is already here. In 80’s now, so 28C. Supposed to help.
Stay active, physically and mentally.
Hi George, noticed this post of yours.While i was preparing my upgrade BOM for Myref noticed Mouser has all values in 1206 package from Rs Audio series.
Would be a good idea to replace all smd resistors with Rs audio series?
What do you think Dario?
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I have used the RS and I like them. They are not often available in all the values, but you can usually get most of those in the signal path. Considering they are not that much more expensive, I think they are worth using in an premium build.
Have fun.
Jac
Have fun.
Jac
There's also the HRG series from Susumu, a high power 1 watt resistor in 1206 size ...
https://www.mouser.co.uk/datasheet/2/392/n_catalog_partition24_en-948804.pdf
https://www.mouser.co.uk/datasheet/2/392/n_catalog_partition24_en-948804.pdf
That is good news! It could have saved me acrobacies like this ..
thank You for signalling..
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I've looked on Mouser's and Susumu's websites and as far as I can see the largest size the RS is available in is 0805 0.125W. Have I missed something?