Hi,
Ditto.
BTW, Ed, would you terribly mind to include me in the private circulation, Gentleman's promise I will not use the information commercially (actually, I find what I do commercially is forced more and more down-market where being able to make a sensible ground layout and being able to choose the right "cheapest possible" capacitor and resistor are about as challenging as it gets...).
Ciao T
Ditto.
BTW, Ed, would you terribly mind to include me in the private circulation, Gentleman's promise I will not use the information commercially (actually, I find what I do commercially is forced more and more down-market where being able to make a sensible ground layout and being able to choose the right "cheapest possible" capacitor and resistor are about as challenging as it gets...).
Ciao T
Hi,
There is a massive reference section in the RDH on earlier work, more recently Geddes/Lee and there was this project at a european (skandinavian) University some-one mentioned, I did not retain that reference.
As for "Harmonics play a large role", it is generally difficult (but not impossible) to make a setup that provides an "ALL ELSE BEING EQUAL" while only modifying harmonic profiles. Are you certain your tests where "fair" in the sense of "all else being equal"?
A very good example of "all else being unequal" is the whole shebang about absolute polarity. Most examples of people citing distinct preferences for one polarity come from the primitive "all else not equal" digital approach. Once you correct for the un-equalness somehow the preference disappears.
Of course the market wants a "polarity switch" and so AMR's latest products have one. The same "unequal" one every one else uses. Because you give the paying customer what they want. And they want a polarity switch that makes difference...
Ciao T
There is a massive reference section in the RDH on earlier work, more recently Geddes/Lee and there was this project at a european (skandinavian) University some-one mentioned, I did not retain that reference.
As for "Harmonics play a large role", it is generally difficult (but not impossible) to make a setup that provides an "ALL ELSE BEING EQUAL" while only modifying harmonic profiles. Are you certain your tests where "fair" in the sense of "all else being equal"?
A very good example of "all else being unequal" is the whole shebang about absolute polarity. Most examples of people citing distinct preferences for one polarity come from the primitive "all else not equal" digital approach. Once you correct for the un-equalness somehow the preference disappears.
Of course the market wants a "polarity switch" and so AMR's latest products have one. The same "unequal" one every one else uses. Because you give the paying customer what they want. And they want a polarity switch that makes difference...
Ciao T
If only I had as talented a secretary, heard but not seen!
But SY the folks here find the tests quite interesting.
If there were a reason, or even a place to publish then you could complain. But there have been three times my efforts at an article have been rejected. Care to guess what the subjects were?
Pretty sure, yeah. Not 100% of course. Over the years I've noticed that certain "harmonic fingerprints" seem to have a similar sound (to me). Doesn't matter if they or tube are solid state. But I have no first hand rigorous tests or studies to back that up.
No, not at all. Just born of long experience and interest. I'm pretty sure there is a pattern, that's all. My experiences with the DCX2496 seem to bear this out. And I have an EL34 amp that can be switched from Pentode to Triode mode. The two modes sound a little different and the harmonics measure a little different. There are probably other differences. Those are as close to "all else being equal" as I can think of at the moment.
Just as a data point, I don't always prefer tube electronics.
Hi,
So do I, as it so happens, plus "Ultralinear" & "Super Triode"...
Quite probably. In fact, I would say there are many GROSS other differences.
With respect, that is about as close as Sidney and Porthmouth are.
Of course, if you are looking from Proxima Centauri they are "equal".
From Where I stand it is 14 Hours in a cramped seat in tourist class, like totally no fun for a Gent of my Stature... So they are very unequal (and I hate the where I am not but need to fly to).
Ciao T
So do I, as it so happens, plus "Ultralinear" & "Super Triode"...
Quite probably. In fact, I would say there are many GROSS other differences.
With respect, that is about as close as Sidney and Porthmouth are.
Of course, if you are looking from Proxima Centauri they are "equal".
From Where I stand it is 14 Hours in a cramped seat in tourist class, like totally no fun for a Gent of my Stature... So they are very unequal (and I hate the where I am not but need to fly to).
Ciao T
Riiiiight. 🙄 Same PSU, same tubes, same transformers, same wiring, same voltages, same schematic except where the screen of the output tubes is connected. Yeah, as close as Sidney and Portsmouth. Not.
Sounds like fun, I've got about 450,000 miles saved up, and I would like to visit my friends in Heppenheim anyway. SY can vouch for my taste in red wine.
EDIT - The NDA is unnecessary, I have no interest in profiting from my audio adventures. Of course I would sign it to make all parties happy.
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Go for it, Scott. I'm on Travel Probation at the moment. Save the La Tache for me, though.
BTW, you were right, incredibly good portable SD card recorders are indeed available silly-cheap (less than half the price of the Fostex). Just bought one on impulse and was astonished at how good it is.
BTW, you were right, incredibly good portable SD card recorders are indeed available silly-cheap (less than half the price of the Fostex). Just bought one on impulse and was astonished at how good it is.
Hi Pano,
You may be right, it is not THAT CLOSE after all.
There are a lot of things that change in an amp equipped with a tetrode or pentode output but where it gets really interesting is if and when we throw speakers into the mix.
So I agree with your superior wisdom, definitly not as close as Sidney and Porthmouth...
To be honest, if you used the same output connections but Op-Amp (like recent MacIntosh Amp's) vs. directly heated triode as driver the differences would be much less, possibly like Sidney and Christchurch,if changing the output connection is as I indicated...
But you are also correct, there are material differences in the harmonic spectrum as well.
Ciao T
You may be right, it is not THAT CLOSE after all.
There are a lot of things that change in an amp equipped with a tetrode or pentode output but where it gets really interesting is if and when we throw speakers into the mix.
So I agree with your superior wisdom, definitly not as close as Sidney and Porthmouth...
To be honest, if you used the same output connections but Op-Amp (like recent MacIntosh Amp's) vs. directly heated triode as driver the differences would be much less, possibly like Sidney and Christchurch,if changing the output connection is as I indicated...
But you are also correct, there are material differences in the harmonic spectrum as well.
Ciao T
Hi everybody, sorry if my commentary came off as a marketing promo. It was not, as the amp is still in its beginning stages, and NO final product is decided yet. STILL, we try to research new and different ways to make things, and TAME certain effects that we find in traditional amplifiers. In this case, it might be like adding a supercharger, rather than just cubic inches to an auto engine, and noting its positive effects. Since I really can't talk about the technology, I hope still to convey that I am NOT dead set against negative feedback or IC's. That was the real point of my input.
Think about it this way. Let us say that long ago, the only practical way to make a more powerful auto was to increase the cubic inch capacity. Everything else, such as supercharging, turbocharging, and increasing compression ratio was not considered for various reasons. Then, somebody develops supercharging, developed for high flying planes or faster race cars. The process is refined and made economically practical for automobiles. What an advantage! That coupled with higher octane fuel (usually necessary), and perhaps 'ping' sensors to keep the engine from being damaged, make it a practical add-on to a rather small engine, to get the HP to amazing levels. Yet the engine itself is still lightweight and small.
What we are working on, parallels this sort of approach. It still might not pull trailers very well, but it can still perform in many ways. That is why we are comparing this little amp to a pair of JC-1's with rated 800W into 4 ohms at this time.
Think about it this way. Let us say that long ago, the only practical way to make a more powerful auto was to increase the cubic inch capacity. Everything else, such as supercharging, turbocharging, and increasing compression ratio was not considered for various reasons. Then, somebody develops supercharging, developed for high flying planes or faster race cars. The process is refined and made economically practical for automobiles. What an advantage! That coupled with higher octane fuel (usually necessary), and perhaps 'ping' sensors to keep the engine from being damaged, make it a practical add-on to a rather small engine, to get the HP to amazing levels. Yet the engine itself is still lightweight and small.
What we are working on, parallels this sort of approach. It still might not pull trailers very well, but it can still perform in many ways. That is why we are comparing this little amp to a pair of JC-1's with rated 800W into 4 ohms at this time.
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