Every balanced input transformer circuit I have ever messed around with eats spatial cues. Maybe you can't hear that.
May be. We should ask then Rupert Neve to stop selling consoles and strips with transformers...
My apologies, I looked at R3 not as Rf, but as a Rn running between the input pins (brain-farted the whole circuit). So, yes, they'll look the same. The essential difference here, is the forward gain (absolute value at least) is going to be different between the inverting and non-inverting configurations when set up like this. A g = 2 vs g = -1 (or 21 vs -20...) makes it such that it's appears to me that you're making and apples-to-pears comparison. Close, but not quite the same. We'd need to change up the resistor values to have a g=2 vs g=-2 comparison, whereupon the noise/loop gain functions would obviously change.
So, yes, the noise gain and loop gain of a g = 2 circuit will be the same as a g = -1.
Last edited:
So this land line you speak of...a wire you hook to the cell phone??!?! (yuck yuck...) I think the studio owners are afraid the kiddies with their permanent body modification commonly known as a smartphone will not want to patronize them if they cannot have unfettered access to their precious....must have the precious!!!...
Howie
If you really want resolution, don't use those. If you are chasing a "sound" then that is what those are good for.
Read this,
" Q. Is that why things such as Neve, API and Quad-Eight are all the rage?
A. Are they? Where? It's pretty much all the rage with alternative rockers and new rockers, but not classic rock, R&B and other pop acts — particularly established players who've been around the block. If you want to hear an API, put on Stevie Wonder's Hotter Than July. The whole record was cut through API and it sounds small, dry and dull to me. Compare the sound of that record with A Time to Love, his newest stuff. The quality of the sound is stunning. The cymbals really sound like cymbals on the new stuff. The record breathes and his voice sounds powerful and open.
Q. Then one of the keys to a clean setup is that you have to record a really good artist?
A. It's a double-edged sword — it reveals the good and it reveals the bad.
Q. Do you advocate clean components at every part of the chain? Transformerless mics and preamps? Clean compressors?
A. Usually....."
Go here to read all of it Jim Williams: Behind the Gear with Audio Upgrades | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
You will have to subscribe but it's free.
Last edited:
Sorry for the terrible looking picture (I tend to spray WD40 to rust-proof my projects). But I wanted to show how simple and good-performing this is, in case someone hadn´t looked at this type of amp yet. This is Nelson Pass IP (super-symmetry). But I have not seen a floating power supply in an amplifier and I think it brings some advantages. There is some commonality with the EUVL I/V with its floating supply.
This one is a proof of concept, I simplified it to the maximum, so it has very limited output swing (due to using the same 32V supply for THS4131 and the two LM3875). But the principle can be applied to make a very good amp.
Two input terminals going to series resistors and to the THS4131, two output terminals (load across the bridge so it takes feedback from the two output terminals - very good), floating supply (single). DC offset is 0,2 mV rock solid (with AC coupled source). There is no DC path from the source to the amp (both are floating, I didn´t earth anything yet). Could have been DC coupled with only a differential servo at the source (it doesn´t need a common mode servo if you leave the amp floating and the "ground" disconnected). It is very RF immune and is my best sounding DIY effort to date. I am fully aware that my test amp doesn´t meet code, regulations, etc. This is experimental.
The THS4131 self-centers on the floating power supply, due to internal resistor divider feeding the Vocm pin (V output common mode). I soldered the THS on top of a 470nF MKT cap (from V+ to V- pins, there is no "ground" in this amp). The two feedback caps are 150pF NP0.
This is interesting to look at. With no ground connection, if you earth the source, then all voltages on all nodes of the amp are changing in relation to earth. Nothing fixed.
Attachments
Thanks guys, adding both of you to my ignore list.
Continue your commercial propaganda without my intervention! 😉
Any way I don't see in statistics you contributing to any topic, except jumping on people in this thread.
Last edited:
My apologies.
I thought you were jumping on me, until realised that you just show the name of your sales website in the thread that attracts potential buyers, like some others do. Any way, you are already in my ignore list, so good bye and good luck!
I am devastated, not sure how I will survive this event.
P.S. Not jumping on anybody in particular, but jumping with both steel toed boots on pseudo-technical arguments.
Last edited:
Not at all. Due to the big physical dimensions tubes are fine antennas to all these microwaves around us.
You get much better immunity with small structures, i.e. smd, the tinyer - the better.
generally speaking (as usual), tubes are high Z circuitry and high input Z compared to bipolar SS. This contributes to easier HF/RF pickup up.
-RM
-RM
Last edited:
Does that mean you are going to die over this or maybe kill yourself? Finally a positive contribution to society.
-RM
Believe me, this thread does not reach my customer base. Normal vinyl enthusiasts wouldn't know what to make of this thread.
Unlike many here I don't use the net to hide who I am. That way you know exactly who you are dealing with when I post.
On the flip side, I very rarely post pictures/videos here of what I'm working on. Yet you do. So who is plugging them self more?
Last edited:
Don't feed them Richard; they are happy to any post that helps to show their avatar or signatures. 😀
- Status
- Not open for further replies.