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GB: for 2SK389 and 2SJ109

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#221
Hi guys,

A'af pointed to post #221 (this post), but he meant the instructions in post #211. Please read them carefully, so he can close down the group buy, and send me my goodies 😀

(And Ian ofcourse, then he can start on the Aleph V2....)

Greetings, Harry
 
#227
Payment Done

ampliton
Westley
CfM
dr.strangelover3
cocolino
h_a
Mickeman
efreak0314

FYI: I'm out of town about a week and seperately with my notebook and computers, so slow reply perhaps, but order is still open, pls read carefully POST#211 to order, thanks.

all the best,
a'af
 
#235
Payment Done

Hi Aa'f,

After payment action at 11.08.07
using link: http://www.globidz.org/ptbambich/
I have received this message yesterday:

Your request to send an eCheck payment to ppbay@globidz.org from your bank account failed because your recipient is currently unable to accept funds to their PayPal account.
Please contact your recipient directly to complete this transaction.

Today it was my second attempt to pay You via PayPal
for items ordered by Cambe. ( 10 pcs. of each ).
link: http://www.mediabayar.com/index.php?categoryid=13
I hope this time will be OK.

Regards
Tadek
 
#236
Hi everybody,

if there is a way...

I would *love* to get 4pcs of 2SJ109BL

if anyone will have some spare or A'af or etc...

there is no problem for me to wire/transfer You the money (I've got an account at Bank of America) or cc (us visa) payment or maybe soon the Paypal

thanks,
adamn, cz/europe

ps. going to build Aleph J, will post my version here when I get it done,
anyway thx very much pass
 
#240
I am having problems understanding the following, would be great if somebody could take a few minutes to help me with this!

The highly respected Charles Hansen stated that the V grade with a higher source resistor is perfectly identical to a BL then:

To all of you who are wanting the BL grade instead of the V grade, don't be so picky. The V grade simply has a higher Idss rating. If you don't want to run at a higher current, simply use a larger value source resistor. Then you can make a V grade work exactly the same as a BL grade part.
Click to expand...

And now comes my problem: let's forget that this is a dual part and this rule has of course also to apply to all jfets, so also for 2SK170BL/V or GR/BL.

When we look now at the MC-stage of the Ono or of the pearl, the gain of the MC-stage is calculated as follows

gain=<number of jfets> x output resistor/(source resistor+inverse transconductance of jfet)

(this equation is mentioned in the Pearl-pdf and is also used by other members here)

Transconductance of the K170 is constant and about 22mS.

So if I change the source resistor to fix the current, the circuit loses gain and that is of course not equivalent behaviour.

What am I missing here?

Thank you very much, Hannes

PS: above problem poped up regularly in connection with the Ono, where people where using BL-parts with too large currents (cascode collapsed) and had to go for GR-parts consequently.
 
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