Toshiba 2SK170BL for sales

[spencer]

beiji, jfets have been sent today. Thanks.

 

[Rikkert1978]

Thanks for the jfets, they arived today! Excellent.

 

[JeroenR]

Maxlorenz
tinitus
JeroenR
rikkert1978
Jfets have been sent and take about 2 weeks to arrive. Thanks.

I received them today so really quick shipping!!

Thanks!!

 

[spencer]

jormajj
fcaton
Bill
Marco
Alberto
william2001
All you jfets have been sent today. Thanks.

 

[spencer]

J74BL is out of stock!

 

[EDDELARUE]

J74BL only left few hundred and only sell in quad. Price is $6 for 4 pcs with Idss within 0.2mA.

Got about 100 J74V NOS, lead a bit dirty. Sorted into 0.5mA Idss range. $1 each.

Hi Spencer,

do you have those fets above, yet ?

eD

 

[spencer]

eD,
I have less than 100 pcs J74BL on hand and thus I would like to stop selling from now on and keep for my own use. I still have some J74V for sales if you are interested.

 

[EDDELARUE]

Ok!

I need some quads but.....do what?

About J74V what Idss they have? Do you matched them too ?

eD

 

[gervenja]

Hello Spencer,

I only need a quad of 2sk170, do you stil have them.

best regards
John

 

[LucasAdamson]

Hi Spencer,

Can you supply me with 2x pairs of matched 2sk170 GR (near to 5mV).

Many thanks, Lucas

 

[spencer]

filip_yordanov
gazzagazza
Jfet send. Thanks.

 

[spencer]

eD, Email send to you!

John and Lucas,
K170BL continue to sell both matched and unmatched. No GR grade but I have low Idss K170BL about 6.8mA Idss matched. Please write to my hotmail address if interested.

J74BL out of stock!

Spencer

 

[LucasAdamson]

Hi Spencer,

Thanks for getting back to me. The design calls for 4-6mA jfets. What would be the effect of 6.8mA Idss? More gain? Would this potentially unbalance the whole circuit? I am building Mads K Hoaas's Atlantis RIAA.

Many thanks
Lucas

 

[spencer]

Can you post the circuit here so that others can help? Most likely the bias source resistor need to be changed to higher value for high Idss jfet.

 

[LucasAdamson]

I'd rather not go there, as I'm not an EE. I wanted a design that was tried and tested and highly regarded, so I don't want to go tinkering. Many thanks though, Lucas

 

[LucasAdamson]

Here's the schematic of the design I will be following. I have PCBs on the way:

What do you think? 6.8mA ok as it is, or are adjustments necessary?

 

[LucasAdamson]

Here's the schematic of the design I will be following. I have PCBs on the way

What do you think? 6.8mA ok as it is, or are adjustments necessary?

 

[spencer]

Lucas, if the Idss of K170 is 4mA, how can there be 5mA flowing down the jfet path??

I think the jfets Idss should be at about 6mA as there is a 10R source resistor to give you about -0.05V bias (or -1mA less from Idss).

In conclusion, there is an error on the Idss specification in the circuit. On the other hand, I do not see a big issue to use 6.8mA jfets as the source resistor can be increase to get 5mA current flow at the jfets.

 

[spencer]

Another comment is that the gain of the circuit will be smaller if the source resistor is increased. Thus it should not be too high say below 15 ohm.

 

[pilli]

eD,
I still have some J74V for sales if you are interested.

Hi Spencer,
I'd like 8 pieces J74V, matched pairwise if possible.
How much is that with shipment to France?

Are there any K170V available?
(sorry, I didn't read the entire thread)

If yes, I'd like 8 pieces of those too.

Thanks,
pilli