[sdiy] [AH] U726hc Real deal?

[Rick Jansen]

There's a MAT14 now, and a MAT12, as replacements.

Rick


> On 09 Sep 2015, at 19:43, Tom Bugs <admin at bugbrand.co.uk> wrote:
> 
> I guess there's a few other ways, yes, to do a matched pair with integral heater.. but the idea here was really a drop-in clone for the ua726
> (not that I actually have any personal need for them - just aware of the ridiculous scarcity pricing that keeps cropping up - and figured it looked do-able - ie. fun project potential, not that I really need more projects..)
> Also MAT04 now says obsolete.. THAT300 series would be a fine replacement in that case.
> Ta, Tom
> 
>> On 09/09/2015 18:36, Rick Jansen wrote:
>> Use a mat04.. Two transistors as the matched pair, one as heater, one as sensor. One external transistor as a clamp. See the circuit at the bottom of http://dropmix.xs4all.nl/rick/Emusic/Moog/moogvcf_schematic.gif
>> 
>> Rick
>> 
>> On 09 Sep 2015, at 15:19, Tom Bugs <admin at bugbrand.co.uk> wrote:
>> 
>>> I wondered before why no-one seems to have done a clone of the ua726.
>>> 
>>> Doesn't *SEEM* all that complex?!
>>> A nice matched pair (eg LS318) is the main core.
>>> 6 transistors (I presume general purpose?), 2 x 6V2 zeners and 6 standard resistors.. - those parts being for the heating element.
>>> 
>>> Get the pin placement right, encapsulate it in goo.. 
>>> 
>>> What am I wrong on? 
>>> 
>>> [I don't want to fully take on such a project, though could potentially do a design up for initial testing with a view to someone running a production in a friendly open-source-ish manner]
>>> 
>>> Tom
>>> 
>>> 
>>> 
>>>> On 09/09/2015 14:00, . . wrote:
>>>> Wow don't pay 90$ for that!
>>>> 
>>>> I've bought a few fakes some years ago for about 10-15$ each iirc  They worked according to my tech at the time.   It's hard to say if they perform exactly the same, I ended up putting in a real one in just to be sure.
>>>> 
>>>> 
>>>> 
>>>>> On Wed, Sep 9, 2015 at 7:42 AM, Synth Parts <synthpartsdotcom at gmail.com> wrote:
>>>>> Also very suspicious is the pic of the one with the year 2000 date code and that there's no pics showing the pins (they were gold on the real ones)...
>>>>> 
>>>>> Doug 
>>>>> synthparts.com
>>>>> 
>>>>>> On Wed, Sep 9, 2015 at 4:34 AM, Kenny Balys <kenny at beatkamp.com> wrote:
>>>>>> 
>>>>>> I doubt that these were ever shipped to, or made in China so I would look elsewhere. Its                             hard to imagine that in the 1970's, Fairchild, in the height of the cold war, would be manufacturing vital components such as these in China.
>>>>>> 
>>>>>>> On 09-09-15 09:29 , Synth Parts wrote:
>>>>>>> I recognize that sellers name as one selling fake SSM2040s a while back.
>>>>>>> Lots of feedback regarding fake parts -
>>>>>>> 
>>>>>>> http://feedback.ebay.com/ws/eBayISAPI.dll?ViewFeedback2&userid=polida2008&iid=400613597638&de=off&items=25&which=negative&interval=365&_trkparms=negative_365
>>>>>>> 
>>>>>>> Doug
>>>>>>> synthparts.com
>>>>>>> 
>>>>>>> On Tue, Sep 8, 2015 at 10:30 PM, Larry Dee <mintlake at bctonline.com> wrote:
>>>>>>> 
>>>>>>>> Is this the real thing?
>>>>>>>> 
>>>>>>>> 
>>>>>>>> http://www.ebay.com/itm/1PCS-CONTROLLED-DIFFERENTIAL-PREAMPLIFIER-IC-FAIRCHILD-TO-100-CAN-10-UA726HC-/400613597638?hash=item5d466e61c6
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> I’m so burned out on this issue – sheeeesh for $90 it better be NOS.
>>>>>>>> Tried searching the AH archives for recent content on this subject but did
>>>>>>>> not get anywhere.  Sorry to be redundant, but what is the latest word on
>>>>>>>> this part?
>>> 
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> 
> -- 
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