My boards are here!
Here is my implementation of the Aleph J.
These are set up for the 2sj109's.
The artwork is mostly just a cut and paste of Holger’s wonderful work.
I relocated and resized the footprints for the electrolytic caps so that I could fit Elna Silmic IIs. Also I placed the snubber caps as close to their mates as possible.
As for Input/Output I added space for terminal blocks. I realize the use of 2 position terminal blocks for one node is a bit clumsy, but it is an easy, mechanically stable solution.
Go to http://www.rainmakerconsulting.biz/moJO.jpg for a higher resolution picture.
Dave
Here is my implementation of the Aleph J.
These are set up for the 2sj109's.
The artwork is mostly just a cut and paste of Holger’s wonderful work.
I relocated and resized the footprints for the electrolytic caps so that I could fit Elna Silmic IIs. Also I placed the snubber caps as close to their mates as possible.
As for Input/Output I added space for terminal blocks. I realize the use of 2 position terminal blocks for one node is a bit clumsy, but it is an easy, mechanically stable solution.
Go to http://www.rainmakerconsulting.biz/moJO.jpg for a higher resolution picture.
Dave
An externally hosted image should be here but it was not working when we last tested it.
Ive come to this one a bit late , and Ive got a feeling this might have been answered before... hmmmm anyway... Can the J be scaled up to Aleph 5 power ? Im presuming not as the jfets seem to be the limiting factor.
dave
dave
I've finished making Aleph J. I want to thank Mr. Pass for his wonderful design. The amp sounds really good.
I checked the DC offset of both channels and they come to 0.072 and 0.046 when warm (hot actually). What are the acceptable DC offset figures and is there anything I can do to improve these figures?
Wachara C.
I checked the DC offset of both channels and they come to 0.072 and 0.046 when warm (hot actually). What are the acceptable DC offset figures and is there anything I can do to improve these figures?
Wachara C.
Re: Great claas-A designed
Of course. The F5 has more power, more current, more bandwidth,
more damping factor, higher input impedance, less distortion and less
noise.
The Aleph J has a 2nd harmonic character, and the F5 is 3rd harmonic.
rubydac said:
Of course. The F5 has more power, more current, more bandwidth,
more damping factor, higher input impedance, less distortion and less
noise.
The Aleph J has a 2nd harmonic character, and the F5 is 3rd harmonic.
Re: Re: Great claas-A designed
>JB Mode ON<
....... I gotch ya!!.......
>JB Mode OFF<
Nelson Pass said:
>JB Mode ON<
....... I gotch ya!!.......
>JB Mode OFF<
1uF or 2.2uF ?
I used Aleph J in unbalanced mode with 2.2uF for feedback bypass capacitor, my question is if I use original value (1uF) what's result of this change ?
I tested with 2A3 (RCA NOS) SE, I loved J very much but I need more tickness sound from J how do I do ?
Thanks
Rubydac
I used Aleph J in unbalanced mode with 2.2uF for feedback bypass capacitor, my question is if I use original value (1uF) what's result of this change ?
I tested with 2A3 (RCA NOS) SE, I loved J very much but I need more tickness sound from J how do I do ?
Thanks
Rubydac
Attachments
I meant about vocal
My thickness topic is a strong voice of vocal when a singer sing a jazz song (don't bring me flower : best of women voice IV), 2A3 make it easy but J (little) hard to join with this song but for other songs I used J in full power full purpose easy easy !
I use 100KA passive volume for my Aleph J, or I have to use preamp !?!
Thanks
Rubydac
My thickness topic is a strong voice of vocal when a singer sing a jazz song (don't bring me flower : best of women voice IV), 2A3 make it easy but J (little) hard to join with this song but for other songs I used J in full power full purpose easy easy !
I use 100KA passive volume for my Aleph J, or I have to use preamp !?!
Thanks
Rubydac
Has anyone checked the voltage across the sourse resisters?
On my Aleph J I get aound 540 mv
I am using K6-104 — BERGQUIST Thermal resistance:0.3°C/W insulation washers ..I could not source mica anymore.
Heatsinks Conrad MF30-2F-151.5 0.25 thermal resisters
0
The fets are
to touch.
I have not measured it yet but I calculate junction temperature at about 78c
Ian
On my Aleph J I get aound 540 mv
I am using K6-104 — BERGQUIST Thermal resistance:0.3°C/W insulation washers ..I could not source mica anymore.
Heatsinks Conrad MF30-2F-151.5 0.25 thermal resisters
0
The fets are
to touch.I have not measured it yet but I calculate junction temperature at about 78c
Ian
Always, Bill Fitzpatrick is my role model.
With those heatsinks/insulators, 95C junction temp is probably more like it for 115W of juice loss.
(me will be firing up the Jotta's next weeko)
Hey, there's the flying Mill's doctor i like to say Vielen Dank to again
With those heatsinks/insulators, 95C junction temp is probably more like it for 115W of juice loss.
(me will be firing up the Jotta's next weeko)
Hey, there's the flying Mill's doctor i like to say Vielen Dank to again
