Smoothie JFETs how close a match is needed?

[trickpony]

Transistors for the smoothie.
I tested 10 bf245 (all I had and came up with)
0.747
0.804
0.990
1.078
1.237
1.370
1.403
1.440
1.504
1.626

Would the 1.403 and the 1.440 work as a match?
Thanks,
Ben

[jkokura]

1.37 and 1.403 is closer by .004

Jacob

[trickpony]

1.37 and 1.403 is closer by .004

Jacob

Ok, but is this close enough?

[jkokura]

At this point, it's your closest match so I'd go with it and not worry about it.

Jacob

[trickpony]

Well, Ok. Thanks.
But really the question came about because the instructions say that the transistors much be matched, give a link on how to match them (yours, thanks again) but nowhere do I see any instruction on how close they should be/ need to be/ best to be.

Does a difference of .04 matter at all or is it a big deal?
I think I will try out some different values with what I have to see if I get a big difference with say 1.4 and 1.5, compared to the 1.37 1.4....I'll post what I find.

Ben

[madbean]

FWIW: I matched mine to about .5%, but I also measured about 50 devices. What you have may be fine. You just need to try it out and see if you get good phasing. Socketing the transistors might be a good idea in case you need to get some more closely matched ones.

[claytushaywood]

is there anyone that sells matched jfets for phase circuits?  I know guitarpcb used to, but they're always out of stock of em

[pryde]

is there anyone that sells matched jfets for phase circuits?  I know guitarpcb used to, but they're always out of stock of em

Yes indeed. GGG sells a matched set of 2N5485's for $3. I built a GGG phase 45 and these work fine:
http://www.generalguitargadgets.com/component/virtuemart/?page=shop.product_details&flypage=shop.flypage&product_id=189&category_id=8

[trickpony]

is there anyone that sells matched jfets for phase circuits?  I know guitarpcb used to, but they're always out of stock of em

Yes indeed. GGG sells a matched set of 2N5485's for $3. I built a GGG phase 45 and these work fine:
http://www.generalguitargadgets.com/component/virtuemart/?page=shop.product_details&flypage=shop.flypage&product_id=189&category_id=8

GGG states that they are matched within 1/10th of a volt...