The F5X Balanced Preamp
Since we have all of the information about the F5X Power Amp in the Pass forum, I have taken the liberty of putting the F5X Preamp also here.
I hope Nelson wouldn't mind. Else I could ask the Moderators to move it elsewhere.
Attached here is Part 1 of the description.
Patrick
Since we have all of the information about the F5X Power Amp in the Pass forum, I have taken the liberty of putting the F5X Preamp also here.
I hope Nelson wouldn't mind. Else I could ask the Moderators to move it elsewhere.
Attached here is Part 1 of the description.
Patrick
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> wow. i had never heard of this
It has been announced before :
http://www.diyaudio.com/forums/pass-labs/208880-f5x-euvl-approach-build-thread-4.html#post3224078
Patrick
It has been announced before :
http://www.diyaudio.com/forums/pass-labs/208880-f5x-euvl-approach-build-thread-4.html#post3224078
Patrick
aha. i must admit that i never followed the thread very close.
there is something about X-ing that make me go no no😀
there is something about X-ing that make me go no no😀
Nothing wrong with X'ing.
Ask those who build / own the AX variants.
Not to speak if those who build the F5X on their own.
🙂
Patrick
Ask those who build / own the AX variants.
Not to speak if those who build the F5X on their own.
🙂
Patrick
i think it'd the complexity of it that tell me no no🙂
i bet it is very good when it is working🙂
but how is it (F5x and the preamp) when used with a unbalanced source?
i bet it is very good when it is working🙂
but how is it (F5x and the preamp) when used with a unbalanced source?
That has been discussed extensively in the very old Aleph-X thread, and also the F5X Build thread.
Please search and read.
The F5X Preamp supports per channel 3 single ended inputs, as well as 3 balanced.
Of course you can also use many of the SE to Balanced converters around, including many single IC versions.
Patrick
Please search and read.
The F5X Preamp supports per channel 3 single ended inputs, as well as 3 balanced.
Of course you can also use many of the SE to Balanced converters around, including many single IC versions.
Patrick
read 230 replyes to get the gain of the preamp? it is not THAT interesting🙂
well. a aleph P1.7, a borbley pre amp and a J-fet boz will have to do😀
EDIT: it said. about 20db🙂
well. a aleph P1.7, a borbley pre amp and a J-fet boz will have to do😀
EDIT: it said. about 20db🙂
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All to come in due course.
Part II of the article will be on active device choices.
Some time this week.
🙂
Patrick
Part II of the article will be on active device choices.
Some time this week.
🙂
Patrick
Hi Patrick,
I´m glad I still have some 74's🙂
Maybe it is time to build something to replace my X-BOSOZ.
William
I´m glad I still have some 74's🙂
Maybe it is time to build something to replace my X-BOSOZ.
William
We shall make sure that those who subscribe for the project will get perfectly matched (curve traced) 2SJ74s.
We bought enough stock before it went obsolete.
🙂
Patrick
We bought enough stock before it went obsolete.
🙂
Patrick
I received multiple PMs asking about what we intend to do with this preamp project.
Well, as Jacco said, no novelty. We shall do it exactly the same way as the F5X project, with some slight changes.
That means we shall do all the development work ourselves, including measurements and listening tests.
Then we might choose a few experienced DIYers as Beta Testers to verify the design for public acceptance.
When all is ready, we shall offer it as a fully integrated project, just the same way as F5X Batch 2.
The Gerber files for the preamp PCB will be offered to the DIY Audio forum for sales to those who just want PCBs.
Also the same as the F5X.
Time frame ?
We hope to finish building and testing the prototype in Spring 2013, at about the same time as we deliver F5X Batch 2.
Give it another month for Beta testing which might start in Febraury (in parallel with proto tests).
So probably ready for subscription in May 2013.
We'll announce when we are ready. Please be patient.
We'll first publish all 4 parts of the article, hopefully before the end of 2012.
But our sincere thanks for your interest,
Patrick
Well, as Jacco said, no novelty. We shall do it exactly the same way as the F5X project, with some slight changes.
That means we shall do all the development work ourselves, including measurements and listening tests.
Then we might choose a few experienced DIYers as Beta Testers to verify the design for public acceptance.
When all is ready, we shall offer it as a fully integrated project, just the same way as F5X Batch 2.
The Gerber files for the preamp PCB will be offered to the DIY Audio forum for sales to those who just want PCBs.
Also the same as the F5X.
Time frame ?
We hope to finish building and testing the prototype in Spring 2013, at about the same time as we deliver F5X Batch 2.
Give it another month for Beta testing which might start in Febraury (in parallel with proto tests).
So probably ready for subscription in May 2013.
We'll announce when we are ready. Please be patient.
We'll first publish all 4 parts of the article, hopefully before the end of 2012.
But our sincere thanks for your interest,
Patrick