Looks good.
I’d be interest in 2-AB100 boards
Previous you asked about 4.7pf cap size - looks like 7.5mm just comparing to the resistors right beside it. You could order 5mm and bend the legs to ensure it will fit too
I’d be interest in 2-AB100 boards
Previous you asked about 4.7pf cap size - looks like 7.5mm just comparing to the resistors right beside it. You could order 5mm and bend the legs to ensure it will fit too
5 mm, but you can slightly kink the legs to make it fit in 7.5mm pads.
SR212A4R7CAR AVX | Mouser India
second via for 5mm pitch is is left out on left channel😉
SR212A4R7CAR AVX | Mouser India
second via for 5mm pitch is is left out on left channel😉
The inage i had had a single leg option but I see my boards have 5 and 7.5. Great.
I'll be in touch bullit.
Edit.
Cool asymmetric design feature Prasi...just seen that!
I'll be in touch bullit.
Edit.
Cool asymmetric design feature Prasi...just seen that!
Last edited:
Xrk mod fh9
This is my build from post #13686 ordered from PCBWay. The amp is powered with SMPS ,+- 36V,plays very well and not difficult to assembly. The bias is around 70ma per transistor and is not hot at all in normal listening level.
Thank you Prasi and XRK for this amp.
Regards
zoky2
This is my build from post #13686 ordered from PCBWay. The amp is powered with SMPS ,+- 36V,plays very well and not difficult to assembly. The bias is around 70ma per transistor and is not hot at all in normal listening level.
Thank you Prasi and XRK for this amp.
Regards
zoky2
Attachments
wow ! zoky2, built already?
you are fast, man...
Congratulations on the successful build
my pcbs are still on a slow boat from china
A request , if possible post a close up of assembled pcb as a guide to others
you are fast, man...
Congratulations on the successful build
my pcbs are still on a slow boat from china
A request , if possible post a close up of assembled pcb as a guide to others
Last edited:
How would you compare these three amplifiers Prasi has drawn boards for?
Apex AX-14,
Apex FH-9 XRK-MOD-Compact,
FX-8-bimo?
Sound quality?
Complexity to build? (bias setting?)
Cost?
Power?
Full frequency response?
Works with low impedance?
Documentation (existing BOMs so a dummy could build one without having to pick all the parts)?
I am looking to build my first APEX amp and am trying to decide which one.
Thank you,
David.
Apex AX-14,
Apex FH-9 XRK-MOD-Compact,
FX-8-bimo?
Sound quality?
Complexity to build? (bias setting?)
Cost?
Power?
Full frequency response?
Works with low impedance?
Documentation (existing BOMs so a dummy could build one without having to pick all the parts)?
I am looking to build my first APEX amp and am trying to decide which one.
Thank you,
David.
Last edited:
Hello Dave,
it is mightily difficult to get an answer.
all the three have been built by many and with parts in their bin and they worked every time, so its up to you.
it is mightily difficult to get an answer.
all the three have been built by many and with parts in their bin and they worked every time, so its up to you.
I never built the FH-9 since I had built a few FX8s and was very pleased with them. Never built the Bimo mod though. The AX-14 is a sweet amp and with two pair will handle more power. All of them are using parts that are getting harder for find. You would be pleased with any of them I'm sure.
If I understand correctly, you are asking if a 55Vac secondary is too high for an A40. This would give you approximately +/-75Vdc .
Yes this is too high for 3-pairs of outputs. You should have at least 4-pair and to be safe would suggest 5 pair.
But it’s DIY so if you are willing to take the risk you can “try” almost anything. Suggest if you are going to try it, that you buy more robust outputs then the 5200/1943
Trying to gather parts for FX 100 psu. Since BC546, BC 556 7812 & 7912 are not available, what are the alternatives.
Was this the FX8 you made post #6202 based on Prasi's FX8 layout?
Link to post 6202
Thank you,
David.