[sdiy] Buchla 259 timbre circuit and op amp compensation

[anthony]

Oh I forgot to say that that was the same thing as a 3130 I guess...

RCA had a whole slew of part No.s that start with 307-. The NTE catalog 
designates these as "Dynascan" parts. And they can be either CMOS digital or 
CMOS analog (the 307-073's are the only example I have some of) and even 
bipolar analog (one is a 723 voltage regulator - I don't remember its part 
no. because it wasn't in any shape to salvage, but I made a mental note of 
it, without too much lamenting because I have so many 723's: metals cans, 
ceramic DIP & plastic DIP...).

I have a few of each of the following: 307-073 (3130), 307-062 (4013), 
307-076 (4016), 307-146 (4518), 307-167 (4030) & I also recall there being 
They all came from the same piece of precision lab gear which I'm pretty 
sure was either a DMM or a quartz thermometer/slash frequency counter. I 
think it's the former because I remember the quartz thermometer I took apart 
had nixies each with their own driver boards and I have some MC14543's (but 
the displays were LED not LCD...) that I know came out of the same piece of 
gear as the 307-XXX stuff. It's funny that there were also CMOS parts with 
regular part numbers on them in their too. I guess that makes sense. Nobody 
makes gear with 100% of the chips from the same maker. But most of the RCA 
CMOS chips had the normal chip part designators on them instead of the wacky 
307-XXX "Dynascan" numbers.

A lot of parts start with 221-XXX. I have nine NOS LM3900's that have 
221-235 on them. I think I got them in Jim-Pak packs of 3. I probably 
wouldn't have bought them if I hadn't had an LM3900 that I scavanged from an 
old acoustic coupler modem (of all things - actually that modem yielded up 
lots of cool parts and I used the case to put two joystick controllers in to 
make a "Space Box" like Grant Richter's which is as of yet unfinished...). I 
have a few other random parts with no.'s that begin with 221- but I havn't 
found cross-refs. or NTE parts for them to compare.

Oh the things you collect when you've been tearing stuff apart for about 26 
years. Sometimes I have fits and no piece of electronics gear in the house 
is safe. I often end up putting a lot of it back together: like my Pioneer 
car CD/receiver, which sounded great in my Tercel and would have only given 
me a 4x35W chip amp (or was it 2x2X35W chips amps?) and I have plenty of 
chip amps that sound great. My Yamaha Natural Sound Tuner was only partially 
taken apart as I plan to use it as the PLL frequency source for a 
BA1404-based, 1 watt, FM stereo transmitter.

> On Thursday 01 May 2008 16:54, anthony wrote:
>> Hey this has cleared up a sticking point for me! Just try finding 3160's
>> anywhere. What about 3140's? They aren't that much different from 3130's
>> besides having different supply voltage limitations, right?
>
> They have a bipolar output stage,  if I'm remembering right...
>
>> What about using a mix of what you have? I have a number of NTE7144's (a
>> 3140) and RCA 307-073's
>
> Where'd _that_ number come from?
>
>
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