• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Interest for genuine Toshiba 2SJ74BL curve tracer matched quads for J2

As promised earlier in the Semisouth GB, we shall offer 30 quads of curve traced matched 2SJ74BLs to J2 builders.
These are from a matching pool of 1000+ devices, and are curve traced using our own equipment under controlled temperature.
They have Idss between 6.4 and 7.4mA, optimum for the J2 input stage running at 3~4mA bias.

A typical quad set is as follows.
First number is Idss (mA), second number Yfs (mS).

6.42 36.73
6.42 36.77
6.42 36.87
6.42 36.98

Both Idss and Yfs are tightly matched, as can be seen.


The price for each quad set is 600 HKD including Paypal fees and postage by registered air mail worldwide.
The GB is limited to 30 quads, and to one quad per person unless there are surplus at the end.
There will be NO waiting list to avoid dispute.

We shall call for Payment some time in December.
You will receive payment instructions by PM via DIYA when ready.


Thank you for your interest,
Patrick
 
I just checked the matching data for 30 quads,
and can guarantee 0.5% match in Idss (or 0.035mA), and 4% match in Yfs in ALL cases.
When split into 2 differential pairs (as they are packed), the match is MUCH closer.

The set posted in #1 is, by chance, a good pair.
I drew it out randomly, without knowing how representative it is.


Just to be totally transparent,
Patrick
 
Member
Joined 2011
Paid Member
1.Quantensprung one Quad (optional 2nd)
2. obh one quad
3. mordikai 1 quad (optional 2nd)
4. Arthur 1 quad (optional 2nd)
5. Rodeodave 1 quad
6. Tazzz 1quad (optionen 2nd)
7. nashbap 1quad (optional 2nd)
8. Dennis Hui 1 quad
9. Skunark 1 quad
Cut-off point 30 quads.
 
Member
Joined 2003
Paid Member
1.Quantensprung one Quad (optional 2nd)
2. obh one quad
3. mordikai 1 quad (optional 2nd)
4. Arthur 1 quad (optional 2nd)
5. Rodeodave 1 quad
6. Tazzz 1quad (optionen 2nd)
7. nashbap 1quad (optional 2nd)
8. Dennis Hui 1 quad
9. Skunark 1 quad
10. Russellc one quad
Cut-off point 30 quads.
 
1.Quantensprung one Quad (optional 2nd)

2. obh one quad

3. mordikai 1 quad (optional 2nd)

4. Arthur 1 quad (optional 2nd)

5. Rodeodave 1 quad

6. Tazzz 1quad (optionen 2nd)

7. nashbap 1quad (optional 2nd)

8. Dennis Hui 1 quad

9. Skunark 1 quad
10. Russellc 1 quad
11. darrr 1 quad

Cut-off point 30 quads.
 
1.Quantensprung one Quad (optional 2nd)

2. obh one quad

3. mordikai 1 quad (optional 2nd)

4. Arthur 1 quad (optional 2nd)

5. Rodeodave 1 quad

6. Tazzz 1quad (optionen 2nd)

7. nashbap 1quad (optional 2nd)

8. Dennis Hui 1 quad

9. Skunark 1 quad
10. darrr 1 quad
11. mlwebb 1 quad

Cut-off point 30 quads.