Hattor Audio Autoformer Reference Preamplifier

My experience of using a Autoformer as a Standalone Volume Control is one where I am able to detect a colouration injected by the Autoformer.

The same has been detected when it has been used along side a TVC, where the TVC has increased the noticeability of the colouration that is able to be detected.

My AVC is not my first pre amp option of late and it is out on loan, it is the VC for a DHT Pre Amp Design a friend has been fine tuning using Type 26 Valves.

As a very very lay description, the AVC is used at the back end of the Circuit when the Signal is sent to the Power Amp. In a system I know very well with a Pre Amp Design I am familiarising myself with, I can't detect the Colouration that the AVC / TVC has added when used as a more conventional device within a system. 

@mitch2 stated " the AVC sound was transparent, organic, and displayed a touch of warmth or body. "

This is not a criticism of the above description but a alternative description on how detecting such traits effected a different individual.

I agree there is Warmth or Body, In a variety of systems having heard a AVC / TVC in use, to my sensitivity and perception,  Warmth or Body, equated to a Weighty Underpinning of a Note > Vocal, to the the point it was a distraction for being the trait being noticeable.

For myself who has Transparent Devices, by Transparent I mean as good as invisible as a influence on a End Sound, Invisible to the Point, the Sources Effect on the Power Amp is all what is being produced as an End Sound.   

My experience of a AVC / TVC as a conventional place in a circuit as a VC does not leave me being able to suggest the encounter can be described as being  Transparent, the influence of the AVC / TVC on the End Sound produced is easy to be discerned.