Dispre II PCBs available

[qusp]

may I ask what the output devices are? and what IDSS/VGS range for the JFETS? I am making an order at BDENT and the shipping from them is not cheap, so I would like to get as much as I can with this order

 

[PMA]

The JFETs are, as described in
Dispre 2 - JFET english
2SK170/2SJ74, with Idss in range 4 - 9mA, but all matched to +/-0.2mA for 8mA devices or +/-0.1mA for 4mA devices.

The output transistors are BD139/140. The rest are BC550/560.

 

[qusp]

thanks, yeah I saw the devices, but couldnt find a specific reference to the IDSS matching range. dont know whats up with zoufang, hope he returns, such a batter deal than elsewhere

 

[chlorofille]

Dispre 2 jfet board + PS board + matched jfets have arrived !
thanks Pavel.

Dispre 2 jfet + Carlos DX Blame ES = master reference integrated amp ? =)

 

[PMA]

I am glad it has arrived quite fast in Malaysia, it took just one week.

Regarding those who asked me for PCBs for a true balanced version, right now I have just 4 boards for sale. I will contact the guys who wrote me by e-mail. Any questions or requests please address to macura at centrum dot cz.

 

[Harolda]

Pavel, do you still have some balanced pcb available. I have interest in 2 (with 2 PSU pcb's).

kind regards

Harold

 

[PMA]

Harold,

I have produced 8pcs of balanced PCBs and sold them out all. In case there are more customers interested in these boards, I will produce them again.

Best regards,

 

[Harolda]

but i could use single ended boards to construct a balanced setup as well, or not? LAthough i am still interested in balanced boards if you have more buyers.

regards,

Harold

 

[PMA]

Yes, you might use 2 SE boards, with modified volume control (like stepped attenuator).

 

[Harolda]

I would use my stepped attenuator anyway. I have a nice 46 step now which i use in a "passive"pre amp.

So when using single ended:

1) For my pre amp, fully balanced i would need two SE boards and 1 PSU.
2) For my headphone amp i would need 1 SE board and 1 PSU

Can you also supply the matched FET's with the PCB's? How can i order?

regards,

Harold

 

[Nisbeth]

Also interested in a balanced PCB if you decide to produce them again.

/U.

 

[PMA]

I would use my stepped attenuator anyway. I have a nice 46 step now which i use in a "passive"pre amp.

So when using single ended:

1) For my pre amp, fully balanced i would need two SE boards and 1 PSU.
2) For my headphone amp i would need 1 SE board and 1 PSU

Can you also supply the matched FET's with the PCB's? How can i order?

regards,

Harold

Yes, I can sell the matched JFETs as well. Right now, even my SE PCB stock is getting empty. I will order new boards immediately after 1st of January.

To place an order, please send me an e-mail (on my web page or thru PM here /I have only e-mail PM activated/). I will let you know when the boards are produced.

Thanks,

 

[PMA]

Also interested in a balanced PCB if you decide to produce them again.

/U.

Thanks, I will let you know.

Regards,

 

[Harolda]

Pavel,

did you ever use the ALPS in shunt mode with these boards. Would also be an advantage for the balanced boards, you would only need a stereo ALPS. I do this in my cross over, works very well and pot is not in signal line.

Looks like this

(+)IN---R1---------R1 ---OUT(+)
|
R2 (id needed depends on pot)
|
10k ALPS
|
(-)IN---R1---------R1----OUT(-)


regards,


PS the ALPS is now replaced by a stepped attenuator because the channel matching of the ALPS is not good enough for me.

Harold

 

[PMA]

Harold,

yes, this is one of the possible options. One of my customers is doing that same way.

Regards,

 

[Harolda]

Dear Pavel,

do you have boards available at the moment? Could you send me a pm with the cost (including shipping)?

regards,

Harold

 

[PMA]

Message sent, thanks.

 

[Wilhelm Hahn]

Dear Pavel,

Do you have this board available at the moment? I want to build this DISPRE 2-JFET and I would order 1.
Could you send me a pm with the cost (including shipping)?
fwhahn@gmail.com