HI > On Nov 20, 2014, at 7:45 AM, Jim Lux <jimlux@earthlink.net> wrote: > > On 11/20/14, 4:04 AM, Bob Camp wrote: >> Hi >> >> As I recall, the whole LH series was a multi chip rather than >> monolithic IC approach. Even back in the day, that made them >> expensive parts. There are other parts that make fine 10 MHz buffers >> that only cost a dime. >> >> Bob >> > Isn't that the significance of the LH.. Linear Hybrid vs LM - Linear > Monolithic In some cases the “hybrid” only meant more than one chip. It did not always include the stuff that I’d consider to make it a full thick film or thin film circuit. > I don't recall seeing many single parts in the 80s for a dime that could The topic at hand started out as driving 10 to 20 dbm into a 50 ohm load at 10 MHz. Even with reasonable constraints on phase noise and ADEV, you can do that for about a dime in semiconductors. > drive a big inductive load at tens of MHz. > > Today, I think that would still be a challenge, but certainly, we've got a lot more alternatives available. Which is why I’d save these neat old beasts for places where they really truly are needed. Bob > > >>> On Nov 19, 2014, at 9:00 PM, Jim Lux <jimlux@earthlink.net> wrote: >>> >>> >>> Interesting parts.. They aren't kidding when they say you need good >>> power supply bypassing and decoupling.(a comment that is in the 84 >>> book but not the 75 version) I'm trying to remember what I was >>> using them for: driving a YIG tuning coil in a phase locked loop, I >>> think, but it might have been driving a fast RF switch. >>> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

Hi The only time I ever used them, it was inside the loop with an op-amp. That probably reduced the impact of non-ideal behavior. Getting back to the box that started all this. It’s got what looks like a high(ish) power linear amp already on the board. It’s made up of discrete parts. I have no idea how it’s hooked in, but it’s there. Bob > On Nov 20, 2014, at 7:17 AM, Gerhard Hoffmann <dk4xp@arcor.de> wrote: > > Am 20.11.2014 um 13:04 schrieb Bob Camp: >> Hi >> >> As I recall, the whole LH series was a multi chip rather than monolithic IC approach. Even back in the day, that made them expensive parts. There are other parts that make fine 10 MHz buffers that only cost a dime. >> > We had them in our ultrasonics systems for material testing. They were NOT well-behaved. > Among others, vastly different rise & fall times and Tpd. > They were gone as soon as Comlinear presented the first current feedback amplifiers. > > regards, Gerhard > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.