Hi,
If the hearing impression of A is preferred over B any technical argument against A becomes rather irrelevant (as long as the devices comply with certain safety and law standards).
jauu
Calvin
This sentence may be objectively true under the premise(!) that the only correct way means: A "totally subjective impression created by the listeners hearing sense". It may also be true under the premise that You invite the artists and let him or her or them originally perform at Your home.
It now becomes very obvious that You talk rubbish about things You seemingly don´t have a clue about. No special parts at all are needed. Simple BC550 work very well here. The level of distortion depends very much on the bias points, the used parts, the chosen voltages and -not-to forget- the percentage of fullscale output signal (mostly -3dB or -6dBfs).
Ah Yes, and earth is flat and the Titanic unsinkable and Nuclear plants are absolutely and eternally safe. One could lough about Your sentence if You wouldn´t make it a religious belief.
A realist would have realized in first place, that HiFi is a luxury item and lifestyle hobby which is based on subjective hearing impression alone.
If the hearing impression of A is preferred over B any technical argument against A becomes rather irrelevant (as long as the devices comply with certain safety and law standards).
jauu
Calvin
Different people perceive sound differently, just as different people see colors differently. Not only that, our hearing perception changes with age and other factors, so what sounded good to us maybe 20 years ago may not sound good to us today.
That's not because there where "unmeasurable" it was just because some people made mistakes in interpreting those measurements or they didn't pay at all attention to them (like the fragility of Titanic steel on cold temperatures).
If you perform a measurement to something, you still need human interpretation of that result. It does NOT make that object "unmeasurable".
First of all - "talk rubbish" is an insult that does not add anything relevant to your argument.
You have no clue how thing those transistors have to matched and what transistors you HAVE to use in order to achieve any audio performance and stability with that schematic. Sure, it "works" with any transistors, but for some people "works" is not equal with "works well".
Last edited:
I've been playing with current feedback IC's.... very nice, managed to get my CD player sounding almost the same as my reference transport / DAC combo, but I do have another week of my holiday leave, so everything is possible.
Boky
Yes, current feedback IC's are good, and the Analog Devices AD811 is a very good part for an I/V converter. Walt Jung wrote about this device in the The Audio Amateur in the '90's. 2500v/s slew rate. I use the 811 with some LC filtering in front of it, to reduce the RF going into it from the 1541.
Hi, seeing you have played around with this very interesting opamp, have you found out what the input and output internal opamps are? Can you tell me if it only has 8 different level settings, or am I missing something?
Cheers George
Hi George,
As far as I can work out, there's no input opamp. Input goes to a ladder attenuator, the tap-off point being controlled by a DC voltage. The output opamp appears to be based on either an AD830 or something very similar.
http://www.analog.com/static/imported-files/data_sheets/AD830.pdf
I think you're missing something yep
Its gain is continuously variable through about 40dB of range, controlled by a DC voltage. I'm using the AD605 as my system volume control nowadays and it works a treat - no zipper noise from the volume control at all. I'm looking forward to making it remoteable in future
As far as I can work out, there's no input opamp. Input goes to a ladder attenuator, the tap-off point being controlled by a DC voltage. The output opamp appears to be based on either an AD830 or something very similar.
http://www.analog.com/static/imported-files/data_sheets/AD830.pdf
I think you're missing something yep
Its gain is continuously variable through about 40dB of range, controlled by a DC voltage. I'm using the AD605 as my system volume control nowadays and it works a treat - no zipper noise from the volume control at all. I'm looking forward to making it remoteable in future - Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.