Gyrator loaded Son of ZV9/F3

[marconi118]

what abut CPH5901 it contains a 2sk932 and a cascoding 2SC4639 in the same package

 

[juma]

It might work all right

 

[marconi118]

will the j111/j112 or J308/309 have too low Yfs for this design?

 

[juma]

No go

 

[marconi118]

I will go with the CPH5901 rated 12-20mA idss.... found at RS

any advice/preference on laterals easy to find in Germany? without fake risk?

 

[juma]

2SK 1058: Transistor 2SK 1058 bei reichelt elektronik

2SJ 162: Transistor 2SJ 162 P-FET 160V 7A TO-3P bei reichelt elektronik

I will go with the CPH5901 rated 12-20mA idss.... found at RS

Mouser has them too:
CPH5901G-TL-E ON Semiconductor | Mouser Deutschland

 

[marconi118]

If the 2sj47 from Reichelt are fake then there is a risk that the laterals are fake too?

 

[juma]

.... risk that the laterals are fake...

No

 

[marconi118]

you tested, the laterals at reichet are genuine?

 

[juma]

Bought several batches from them.

 

[marconi118]

Great!

 

[marconi118]

You wrote that you like laterals only as buffer configuration. What mosfet pair do you like as common source? 2013/313? 1530/201? Any other?

 

[juma]

You misunderstood me. Laterals can work great in common source mode too.

 

[marconi118]

can we say that the 2sk932 is good replacement for bf862?

 

[juma]

It will work but I would not use it. Transfer characteristic is funky.

 

[marconi118]

what about the 2sk3557?

 

[juma]

Good

 

[marconi118]

what is the minimum class A bias current when 2SK1058 & 2SJ162 start to sing?

I don't need more than 5W, PSU will be 30V

not having a lot of heat-sinking, I would like to use the strict minimum bias where the mosfets start sounding good...

with IRFP it seems minimum is 1A?

 

[juma]

what is the minimum class A bias current...

What amp do you mean and what speakers/load you want to drive with it ?

 

[marconi118]

your amp of post 164 (pream with laterals as buffer for output)

Gyrator loaded Son of ZV9/F3

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