I understand more fully than you seem to.
Remember I also come from a test and measurement background. I understand the minimal component type design of this amplifier. What I told you is fact and I won't waste my time trying to argue anything with you.
You are assuming no thermal gradients and perfectly matched components. None of this is true. If this design was as good as you think, ICs would be designed this way, and part matching is even tighter on silicon. Well, they are not designed this way. It isn't a bad design and I am not knocking it, but you seem to have blinders on. Cool.
I am also an HP fan, familiar with your meter. I have similar equipment and currently use 34461A and 34465A meters, still have my 34401A's, 3456A and 3457A meters. Meter movements average out noise, which you should know. Remember, I repair and calibrate meters and other test equipment. Arguing with me will not go well for you - except I won't waste my time so you're safe I guess.
-Chris
Remember I also come from a test and measurement background. I understand the minimal component type design of this amplifier. What I told you is fact and I won't waste my time trying to argue anything with you.
You are assuming no thermal gradients and perfectly matched components. None of this is true. If this design was as good as you think, ICs would be designed this way, and part matching is even tighter on silicon. Well, they are not designed this way. It isn't a bad design and I am not knocking it, but you seem to have blinders on. Cool.
I am also an HP fan, familiar with your meter. I have similar equipment and currently use 34461A and 34465A meters, still have my 34401A's, 3456A and 3457A meters. Meter movements average out noise, which you should know. Remember, I repair and calibrate meters and other test equipment. Arguing with me will not go well for you - except I won't waste my time so you're safe I guess.
-Chris
I don't think that this is the case. The bridged design of this fully symmetric differential amplifier ensures thermal drift is cancelled. This is not hard to understand yet you come here and tell me I should consider it.
IC performance is limited by the manufacturing process.
Not on a potentiometric-type voltmeter like the 3440a.
...which you should know.
I put the disclaimer above about the voltmeter to avoid someone trying to explain root-mean-square to me. You did anyway. I think your ego speaks for itself.
It's a dual monolithic NPN so doesn't "bounce all over the damn place", but there is a reaction. I blew air at the board from a couple of feet away and the offset rose to around 2mV a second or two later before settling back down.
Hi hadley,
Okay, you're missing the basics completely.
Both the other two members above are also highly experienced.
You are focused on the design being perfect - which it isn't. Maybe some day once you have learned something you will think back and be embarrassed. At the moment you would be better served by being quiet, and studying like mad.
-Chris
Okay, you're missing the basics completely.
Both the other two members above are also highly experienced.
You are focused on the design being perfect - which it isn't. Maybe some day once you have learned something you will think back and be embarrassed. At the moment you would be better served by being quiet, and studying like mad.
-Chris
Hello friends, great to see Hadley name here. I hv the el34 pp power amp, sud be similar to marantz except using 12ax7. Also a germanium transistors pre amp. Just lovely aroma of the 60s inside. Both bought from ebay may be around 2003.
Hope to know more about Hadley.
3 years of locked down seems like a long time, emerging from it, the hifi field is very different, as if it doesn't exist, at least here in Singapore. Yesterday a second hand hifi shop told me my macintosh mc 2600 worth less then 3000 usd, which is a shock.
I have been clearing my electronics collections, so far throwing a way mostly cheap parts i got from China. Curious how my generation of hobbyist on their collection, i am 67 vintage 1956.
Very best rgds
William Lee, Singapore 2023, apr 27.
Hope to know more about Hadley.
3 years of locked down seems like a long time, emerging from it, the hifi field is very different, as if it doesn't exist, at least here in Singapore. Yesterday a second hand hifi shop told me my macintosh mc 2600 worth less then 3000 usd, which is a shock.
I have been clearing my electronics collections, so far throwing a way mostly cheap parts i got from China. Curious how my generation of hobbyist on their collection, i am 67 vintage 1956.
Very best rgds
William Lee, Singapore 2023, apr 27.
It was one slow ascent and then a single decline back to zero... with the cover off. Look at the design. Understand this amplifier is essentially an auto-zero circuit.
What basics am I missing?
Let's recap the thread from the top:
Here's part your first post on this thread and it has absolutely nothing to do with the Hadley 622C:
Even after you were shown the patent with Dawson Hadley's name on it, you continued to argue the point as if you weren't wrong.
It does, doesn't it? Was that not pointed out to you by another member? Again, this is actually basic and you are the one who is again the party guilty of missing the fundamentals here.Heck, the amplifier you presented doesn't even use a differential pair! One might argue it is closer to an NAD on that basis.
The recent post was not the first time this temperature drift nonsense of yours was brought to this thread.
Still stand by this? How laughably wrong you were with the "as long as it functions".
You haven't added anything constructive to this thread for ~18 months now. Clearly, you find the perfection of this design without all of the standard peripherals to be upsetting. It's probably best if you discontinue responding.
lol!
Okay, I'm an idiot that has no idea what he is talking about despite my qualifications and approvals from both the T&M and audio world.
Enjoy your life. If at some point you actually do learn some of this stuff, you will look back and be embarrassed. My advise to you hasn't changed. Study your butt off and learn this stuff, because right now you are not aware of how this stuff really works.
Okay, I'm an idiot that has no idea what he is talking about despite my qualifications and approvals from both the T&M and audio world.
Enjoy your life. If at some point you actually do learn some of this stuff, you will look back and be embarrassed. My advise to you hasn't changed. Study your butt off and learn this stuff, because right now you are not aware of how this stuff really works.