OTL Asylum

I believe in your first concept ...

110.174.140.188

KIS

A

In Reply to: RE: Without a window??? posted by Capt. Z on July 22, 2012 at 00:45:44

Preamp sucks.

High quality stepped attenuator; ladder or series, installed in the amp is the way to go. Yes, you need to drill a hole on the chassis of your amp, else you lose too much.

IC needs to be also short to prevent capacitance built-up.

My tube amps need on 300mV to give full power. What is yoyrs?

However in most cases where the input sensitivity of the amp is low (1.2mV is pretty standard), a preamp does improve dynamics, but still loses openness and liquidity.

YMMV obviously.

Follow Ups:

RE: I believe in your first concept ... - Capt. Z 05:10:16 07/22/12 (6)
I have used a Bottlehead SEX amp with the Truth and had no issue driving it to full output with the Truth.

Now I have a Transcendent T16 OTL and have more gain then I ever will be able to use, no matter what I have hocked up to the Truth. Sorry, don't know how much power the T16 needs to be driven to full power.

I guess the one big draw back of the Truth is that it has no Gain. However, for most of us that is no issue.

Bellow is some of the manufacturer's comments:

It has an input impedance too high to measure, output impedance is a couple ohms, bandwidth is to 60Mhz, slew rate is a couple hundred V/microsecond.

There are no capacitors or resistors in the signal path. There is no potentiometer in the signal path.

It uses photo cells to control the volume. It does not use optocouplers.

It is an "active" device and suffers none of the "problems" that "passive volume control/pre amps" have. It can drive long (30 feet) cables with ease.
- RE: I believe in your first concept ... - KIS 17:58:03 07/22/12 (5)
  Marketing Blurb!!! Never heard any manufacturer who said that their product is inferior.
  
  "It uses photo cells to control the volume."
  
  If you have a scope, check the square wave performance.
  
  Any resistor type (step ladder or series) pot will give square wave performance 100 times better than photo cell.
  
  All it is, is that you just happen to find the compensation from this device soothing to your ears.
  
  Enjoy it.
  - RE: I believe in your first concept ... - tyu 06:48:28 07/23/12 (3)
    Maybe{A truth}....to you ...But The truth.... not so much...More like one mans o-pine...sounds like fun....$899...Looks like all rat-shak parts....All i see pramps as are EQs....your saying this is less of a EQ...cool....This Well make the Klipsch sound good....goodluck
    - RE: I believe in your first concept ... - Capt. Z 12:44:47 07/23/12 (2)
      I remember seeing that 'Truth' It was either the prototype or one of the first once, that the owner drew these symbols on.
      No EQ is the best EQ - setting when it comes to pre-amps or any other part in the signal chain.
      But more importantly is NOT to degrade the sound and that's why I love MY Truth.
      
      Edits: 07/23/12
      - just one mans o-pine.... - tyu 04:35:56 07/24/12 (0)
        
        In Reply to: RE: I believe in your first concept ... posted by Capt. Z on July 23, 2012 at 12:44:47
        
        Less is more!....ok..but every thing is a EQ?...Wire one of the bigest....right after the ROOM...If you set all your Speakers an amps...an your Turth outside...were there is no Room...Wire still has to be used..
        This will get you closer To what?...
        But most will not go there even if thay like the sound of Your Truth....
        My Krell KSL preamp help me get the sound i like...like your geting out of your truth...But in My room...an with my wire ..an with my tube amps there a BIG EQ....most hate tubes...thay say there to EQ,y...Thay like SS amps there better EQs
        
        SO...you say
        
        No EQ is the best EQ - setting when it comes to pre-amps or any other part in the signal chain.
        But more importantly is NOT to degrade the sound and that's why I love MY....what ever....Right?
        
        So anyone can say anything...but is it A Truth?
        Mybe to them..!
        Here just 3 of the BIg EQs i am useing today in the pic....So i gess this is my Truth!...Today anyway.....goodluck
      - Truth be told :) nt - KIS 20:18:29 07/23/12 (0)
        
        In Reply to: RE: I believe in your first concept ... posted by Capt. Z on July 23, 2012 at 12:44:47
        
        .
  - RE: I believe in your first concept ... - Capt. Z 00:25:26 07/23/12 (0)
    Hello KIS;
    
    I wouldn't know how to use a scope, but I know how to listen.
    
    I don't hear any compensation from this device to sooth my ears, all I hear is the most accurate and detailed music.(rest my case)

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