[Premium-Rx] Another HRO-600 component problem

[John Miles]

That's some nice parts-sleuthing.  Crystalonics makes the CP-666 and similar
high-IP3 JFETs, a part familiar to those who have built the AMRAD LF preamp.
They have been willing to sell small quantities to hams in the past, at
least around the time that article came out in QST.  Their website claims
they're now in the "obsolete Motorola parst" business, which sounds like
good news!

That being said, a couple of the six CP-666 JFETs I ordered from them were
DOA.  You might order a few of the 3N111s to make sure you get a good one.
:)

-- john KE5FX

> -----Original Message-----
> From: premium-rx-bounces at ml.skirrow.org
> [mailto:premium-rx-bounces at ml.skirrow.org]On Behalf Of Gary Geissinger
> Sent: Wednesday, March 30, 2005 9:08 AM
> To: premium-rx at ml.skirrow.org
> Subject: RE: [Premium-Rx] Another HRO-600 component problem
>
>
> Jim,
>
> Here is some info for you:
>
> Device Polarity BVEEO  BVCBO  IEEO    ree (sat) Voff    ft       Package
> Type            V Min. V Min. nA Max. ohms Max. uV Max. Mhz Min. Number
>
> 3N111  PNP 	    30     50     0.5     50        150      12
> TO-72
>
> Try Crystalonics:
> http://www.crystalonics.com/Dual%20Emitter%20%283N%29%20Transistors.htm
>
> 73's,
>
> Gary WA0SPM
>
>
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>
> -----Original Message-----
> From: premium-rx-bounces at ml.skirrow.org
> [mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of James C. Garland
> Sent: Wednesday, March 30, 2005 5:46 AM
> To: premium-rx at ml.skirrow.org
> Subject: [Premium-Rx] Another HRO-600 component problem
>
>
> Hi Gang,
> I'm still plugging away trying to reverse engineer the schematic for my
> HRO-600 synthesizer. One odd component is a 3N111 transistor, which I
> believe to be a PNP dual-emitter transistor designed for chopper
> applications.  I believe it may be bad  (all pins show the same
> voltage),
> but I can't find the pinout for it anywhere.  It's a 4-terminal device,
> presumably with a base, collector, emitter-1, and emitter-2.  Anybody
> got
> the pin connections and (hopefully) the data sheet for this odd duck.
> I've
> never seen dual-emitter transistors before, and am not sure how they're
> used.Tnx!
>
> Jim Garland W8ZR
>
>
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