|
Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
|
|
|
Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
|
In Reply to: Re: both replys posted by thetubeguy1954 on June 21, 2006 at 07:39:38:
Hi TubeguySorry about the pictures, they took the old ones down when they started re-doing the web site.
Scroll down this white paper to the Synergy horn part where it has a drawing of the SH-50http://www.danleysoundlabs.com/knowledge baSE.htm
Here is a recent blurb by a magazine guy on his impressions
http://svconline.com/mag/avinstall_danley_sound_labs/Understand, I do like tubes, I have taken a whack at designing / winding output transformers. Its just that am not keen on some approaches to the design of SET amps.
For example, I understand clearly why triodes and class A, single ended over PP however makes no sense on many levels, perhaps most clearly on the output transformer itself.
I for one would be curious to see what the subjective difference between an SET amp (no fb) and PP configuration using the same drive and output tubes would be. Even with no fb, the PP one will have less distortion and better electrical performance.
Without the DC bias current of the SET design, the same weight transformer core in PP can produce more power with a much lower inductive LF cutoff which lowers the transformers distortion down low.
If I had time to play with tubes / circuitry, this is what I would try, PP class A (and for me, about 10dB of –fb).The measurement thing is tricky.
I am not immune to the desires of the person running the test equipment to be sure.
As an inventor however, one must keep an open mind, I would like to think the things I have developed are a result of that.If one were looking for an unknown something in a signal, there are a limited number of ways to examine it. Each gives a different view of some aspect of the signal.
The electrical audio signal is a Voltage, the mystery thing is within the audio signal, the sum of all of it is the Voltage at any given instant in time.
One can compare what goes in to what comes out to see what difference there are.
The differences can only be in amplitude, frequency and time (that is all there is).One area where traditional measurements have been weak is on transient phenomena, however, since music can be used as the test signal in dual channel analyzers it is possible to look at this too.
Another area that should be probed by amplifier guys is what the output of an amplifier “looks like†when driven through a resistor as the device under test. In other words, with no signal on the input, drive the output from another amp through a resistor (say 8 Ohms)
While the perfect amp would look like a tiny resistor and have no distortion and flat response, driven (as with speaker back emf) it would be interesting to see how different real amps are from that.
My hunch is that the deviation from “ideal†should be visible driven this way.
A speaker across the amp output would let you hear the voltage across the amp when the resistor is driven with music too.
Anyway, I better run, should get back to work.Tom
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: both replys - tomservo 12:49:56 06/21/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
