Hello!
What type of output device the Borbely Millennium use? And how many for each monoblock?
Anyone has a part list or manual to share?
Thanks!
What type of output device the Borbely Millennium use? And how many for each monoblock?
Anyone has a part list or manual to share?
Thanks!
You can use
2sk1058/2SJ 162 , 2sk134/135/176 2 sj50/55/56
Also 2sk1529/1530 And 2sj200/201
How may depends on how high your bias current is.
At a minimum 2 of each device for class AB output stage
4 or 5 of each device if you want high bias class A, he used 8 devices of the 1058/162 in one version for highest bias
Which Millenium the 100 watt or the 150 watt SE version?
The difference is the input stage cascode has second cascode and better VAS heatsinking in the SE version to get higher power
You need 389/109 or matched 170/74 jfet and 246/103 for input stage
VaS uses matched 170/74 jfet and 2013/313
2sk1058/2SJ 162 , 2sk134/135/176 2 sj50/55/56
Also 2sk1529/1530 And 2sj200/201
How may depends on how high your bias current is.
At a minimum 2 of each device for class AB output stage
4 or 5 of each device if you want high bias class A, he used 8 devices of the 1058/162 in one version for highest bias
Which Millenium the 100 watt or the 150 watt SE version?
The difference is the input stage cascode has second cascode and better VAS heatsinking in the SE version to get higher power
You need 389/109 or matched 170/74 jfet and 246/103 for input stage
VaS uses matched 170/74 jfet and 2013/313
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@ticknpop do you have the component values for that one?
I have my servo amp up running. 6 pairs J55/K175 with 2x53 volts under full load in 4 ohms. It's lovley...
BR
Figge
I have my servo amp up running. 6 pairs J55/K175 with 2x53 volts under full load in 4 ohms. It's lovley...
BR
Figge
Borbely's amps can also use 2SK405/2SJ115 (these are the early version of the 2SK1529-30/2SJ200-01)
Just remember that these are also discontinued, so you have to make sure that you are not using counterfeit devices if you get some.
mlloyd1
Just remember that these are also discontinued, so you have to make sure that you are not using counterfeit devices if you get some.
mlloyd1
So which output device should choose for least distortion in pure Class A mode? Quality is more important than quantify for my application.
I would venture to guess that since the 2SK1529-30/2SJ200-01 devices are better complements to each other than the lateral pairs and since they have higher transconductance at the currents of interest that they would be the better device. i think member EUVL aka Patrick has shown some P-N match test results of these devices - you can search for the data.
However, that makes the assumption that one can actually get reasonably matched sets of them even though they have also been discontinued for some years. The laterals are still easily available as new, known good devices from Exicon. I think they even sell selected VGS range parts now!
good luck,
mlloyd1
However, that makes the assumption that one can actually get reasonably matched sets of them even though they have also been discontinued for some years. The laterals are still easily available as new, known good devices from Exicon. I think they even sell selected VGS range parts now!
good luck,
mlloyd1