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I was going to suggest the J310 also. There are some characteristics of a standard J310 that make them a little “better” than the MPF102. One being lower input C and often a higher dissipation. http://www.mouser.com/ds/2/308/J309-D-109346.pdf
Not all the old mpf102’s were same. Radio Shack used to buy them from various foreign manufacturers. None of them looked the same, often unmarked and the characteristics were often slightly different. But not different enough to make any change in the circuit. I used them for Oscillators, buffers and switches and could sub a J310 for any of these. Precise characteristics are not necessary for many of these applications.
I like Fairchild or at least I have quite a few.
From: 4sqrp@... [mailto:4sqrp@...] On Behalf Of Jerry Haigwood
Sent: Saturday, March 30, 2013 5:07 PM
To: 4sqrp@...; 'Barney'
Subject: RE: Re: [4sqrp] sub
You can also check with Futurlec.com. However, the part will be coming from Hong Kong so it will take about 20 days to get here. B & G micro in Dallas has a number of FETs also. BTW, I quit using the MPF 102 a long time ago. For RF I typically use the J310 or the 2N5486. I have a bunch of 2N3819s that I use when I am not too concerned about performance.
"building something without experimenting is just solder practice"
From: 4sqrp@... [mailto:4sqrp@...] On Behalf Of Barney
On 3/30/2013 10:40 AM, Jerry Haigwood wrote: