almarg
Responses from almarg
| Who is using passive preamps and why? Herman -- As I understand it, it's not a TVC. It's a step-up transformer followed by a resistive attenuator.Best regards,-- Al | |
| Who is using passive preamps and why? Hi Clio,I took a look at it. I see that several different transformer ratios are offered. 1:1 and 1:2 will certainly be no problem for low impedance sources. The other two ratios, 1:8 and 1:13, will, as I speculated earlier, result in an overall i... | |
| Who is using passive preamps and why? Is it safe to assume that the Goldpoint is shunt-type?No, they are series types. From the Goldpoint website:Goldpoint Level Controls used to offer Ladder and Shunt type stepped attenuators too. The fact is that with the very low noise, 0.1%, thin ... | |
| Who is using passive preamps and why? Almarg: In your case, with a 10K pot and a 100K amp Zin, at minimum volume control setting the input impedance (not output impedance) looking into the input side of the pot would be 10K. With the control turned all the way up, the impedance would ... | |
| Who is using passive preamps and why? Also, and I think that I have read this above, just want to make sure I understand, with a 10k pot the output impedance rises as the knob is rotated clockwise until it reaches 10k. Did I get this right?No, Herman's relevant statement was:In my exa... | |
| Who is using passive preamps and why? Yes, that strikes me as a good way to look at it, Herman. I notice that at this page of the Goldpoint site the following statement is made, which I believe is incorrect and misleading:When choosing the stepped attenuator value for an in-line level... | |
| Who is using passive preamps and why? so 2 meters of Cardad Golden Reference 12pf/ft should be no problem for the passive approach, with with a 2 meter IC?Yes, that is excellent, due to the very low cable capacitance per unit length. Xc calculates to 101K at 20 kHz for the 2 meter len... | |
| Who is using passive preamps and why? Pubul57: Does the 50kohm of my attenuator address that issue, or does it cause problems on the other end into my 100kohm amp load?Herman's comments accurately addressed the impedance seen by the cdp looking into the resistive volume control, which... | |
| Who is using passive preamps and why? I can understand frequency abberations due to impedance matches, but why would a passive ever be any less dynamic?One explanation which I suspect underlies those perceptions in many cases would be upper treble rolloff caused by the high output imp... | |
| Tube flash Try lightly tapping the tube with a pencil eraser while it is on the tester, to make sure the tube doesn't have a marginal short circuit.Also, it's possible that something else failed in the amp that caused the tube to flash. For instance if a cou... | |
| High Efficiency Speakers Your top 3 or more Thanks Grant, and thanks for the link to the paper, which as it happens I had seen some time ago. As I indicated in my post yesterday, that appears above and was addressed to Ladavid, my experience has been that well recorded, minimally compressed... | |
| High Efficiency Speakers Your top 3 or more Grant, as I mentioned parenthetically in my earlier post I have not heard them, which btw is why I was hesitant to enter this thread previously. Based on the many glowing comments I've read about them; and on how uniquely well they seem to meet al... | |
| High Efficiency Speakers Your top 3 or more Maybe we can get an update after Almarg's arrive?Yes, I should have them in about 3 or 4 weeks, at which time I plan to post a system description with pics, and perhaps my initial listening impressions in this thread as well (although it will take... | |
| High Efficiency Speakers Your top 3 or more I'm surprised that no one has yet mentioned the Daedalus Ulysses, which are 97db and are in the op's price range.Although I have not yet heard them, they have received effusively glowing comments from many users here and elsewhere, as well as in r... | |
| Select Your Less Than Ideal System After compromising on the cabling, or finding lower cost cabling that outperformed higher cost cabling in the particular system, I would save money on amplification by choosing speakers that provide higher efficiency and/or impedance characteristi... |