Interest for Potential GB for Pioneer Super Linear Circuit

[EUVL]

Just a simple JFET source follower using matched JFETs.
See Borbely's article, Fig. 15c.
No source degeneration (Rs = 0R) but with 100R gate stoppers.
https://www.trendsetter.com/v/vspfi... The New Frontier Part 2, by Erno Bordely.pdf

All components are already on the PCB.
Just see recent comments on the main thread (post #23).


Patrick

 

[anatech]

Hi Patrick,
Any idea of cost on this? I apologize if I missed it.

-Chris

 

[EUVL]

Please wait till audition is done and configuration is finalised.

In any case the PCBs will only be a fraction of the total cost.
A 2107 heatsink case is already 50USD including shipment.
2x 25VA toroidal transformer is another 30USD.
1x ALPS ~ 15USD.
RCA's, headphone output socket (we recommend 5-pin mini XLR9, ......
25 pairs Sankens 60 USD, 100 pairs Toshiba 30USd, .....

You should be looking at ~ 350 USD for a serious build with good quality components, and matched devices.
If we decide to use Didden regulators then the bill will go up significantly.

For comparison, a seriously built F5-HA with all its simplicity is around 500 USD.


Patrick

 

[EUVL]

Here is the link :
http://www.diyaudio.com/forums/group-buys/271926-f5-headamp-34.html#post4548553
(Post #339)


Patrick

 

[Algar_emi]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set

Subtotal 23sets

 

[bkdog]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set

Subtotal 24 sets

 

[soldersober]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set

Subtotal 25 sets

 

[EUVL]

We have to limit the first batch to 30 sets, so that we can still manage the support for the build.


Thank you for your interest,
Patrick

 

[EUVL]

So you are NOT using a JFET buffer upfront (2SK209GR) ?
You then need to make sure your source (or pot) is low impedance.


Patrick

This is a good reference to understand why a JFET buffer upfront is a good idea.
http://cds.linear.com/docs/en/design-note/dn84f.pdf

Note that the 2SK209 source follower has one of the lowest input capacitances while still very low noise.
It also has a decent Yfs at ~ 12mS.
A even better choice than a 2SK170 or LSK170 IMHO.

See also post #23 of the main thread :
The Pioneer Super Linear Circuit


Patrick

 

[dshambala]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set

Subtotal 26 sets

 

[pinnocchio]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set
pinnocchio 1 set

Subtotal 27 sets

 

[pinnocchio]

Sorry, had a change of heart

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Lucylu 1 set
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set

Subtotal 26 sets

 

[lucylu]

Lucylu removed far to many projects to do Thanks

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set

Subtotal 25 sets[/QUOTE]

 

[BuckarooBanzai]

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
Bvtrinh 1 set
ymwong 2 sets
leejh 2 sets
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set
Buckaroo Banzai 1 set

Subtotal 26 sets

 

[Algar_emi]

I received all the transistors, now time to match...

 

[EUVL]

Patience required.
Let us know your results and see if they compare to mine.


Success,
Patrick

 

[bvtrinh]

Removed

Bvtrinh removed. Too many projects. Looks like a great project though.

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
ymwong 2 sets
leejh 2 sets
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set
Buckaroo Banzai 1 set

Subtotal 25 sets

 

[bracla]

Bvtrinh removed. Too many projects. Looks like a great project though.

Pluplog 2 set
Lung 1 set
701c 1 set
anatech 1 set
Morde 2 sets
av-trouvaille 1 set
Mjjg 1 set
arthur 3 sets
mlackey 1 set
mlloyd1 1 set
ginum 1 set
ymwong 2 sets
leejh 2 sets
Malvin 1 set
Algar_Emi 1 set
bkdog 1 set
soldersober 1 set
dshambala 1 set
Buckaroo Banzai 1 set
bracla 1 set

Subtotal 26 sets

 

[Algar_emi]

Do we need 30 sets to start this GB?
SB

 

[EUVL]

No, we can start as is with 26 sets.

There are already 3 more sets reserved for the team.
So actually only one more set available.
Unless some other people opt out, which happens all the time.

We start when the reviewer has posted his impressions from the independent audition.


Patrick