P 3100 HV

The Preamplifier

Preamplifiers are the most important components of any High-End system. Source devices connected deliver low-level signals to the preamplifier’s input section, and the unit’s task is to switch and amplify these signals, regulate their volume, process them where necessary and deliver them to the output sockets, ready for the power amplifiers. All this has to be accomplished without altering or falsifying the signals’ content. We have invested a vast amount of effort in designing preamplifiers which meet these requirements in full. The devices are of discrete, fully symmetrical construction, while every single component is the very finest available. The circuitry is housed in cases of uncompromising construction. The design and concept of the P 3100 HV is based on the P 3000 HV. Outwardly, the difference is only the type number. In terms of circuitry, however, the entire preamplifier section, and thus the most important part, has been further improved.

So far, the input and output stages of the P 3000 HV have been coupled to the relay volume control with high-quality capacitors.
In the P 3100 HV a new, very complex circuit board layout compensates for the temperature coefficients of the transistors and the operating points can be set exactly, which means that the preamplifier stages have a pure DC coupling. There are no longer coupling capacitors in the signal path between the input stage, volume control and output stage. The preamplifier board is absolutely voltage and temperature stable.
In addition, we have equipped the digital power supply with more power and shielded it even better. The already oversized toroidal transformer of the analog part was enlarged to 115 VA. The sum of these measures leads to a significant improvement in sound quality.


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High Voltage

In the ingenious overall circuit design of the HV (= High Voltage) series - developed in-house by T+A - all the amplifier stages operate at much higher operating voltages than usual: in the preamplifier the figure is up to 100 Volt, in the power amplifier up to 360 Volt. In a similar manner to valve amplifiers, the actual modulation of all the stages can be kept very low. Only a very small percentage (less than 20%) of the possible excursion of the amplifier transistors is used, thereby virtually eliminating the curvature (non-linearity) of that characteristic. Additional measures for improving the linear nature of the voltage amplifier stages are also employed. In addition to outstanding linearity, the high operating voltages employed offer the advantage of extremely wide dynamic range. We have developed this unique technology for use in all the HV-series machines, since the tremendous sonic improvements which it makes possible can be exploited in the output stages of source devices such as the MP 3100 HV multi-source player as well as in preamplifiers and power amplifiers.


The connector section on the back panel provides impressive evidence of the P 3100 HV’s uncompromising design and symmetrical double-mono construction. The channels are kept consistently separate. The preamplifier circuit boards are of exact identical construction, and are located under the case top cover; this layout eliminates electromagnetic influences. The circuit boards are housed in their own compartment made of thick-walled (10 to 15 mm) aluminium plates, and are completely separated and shielded from the mains unit and power supply in the bottom section of the case. The circuit topology is based on a differential cascode amplifier with hand-selected audio J-FET transistors. All stages are of completely discrete construction with-out op-amps (operational amplifiers). Their linear nature is not derived from “hard” negative feedback, as in the case of standard op-amps, but from the quality of the circuit topology and the components employed, which are carefully selected and adjusted. For this reason virtually no overall negative feedback is required. T+A HV technology enables signals up to 80 Vss to be processed without distortion - a value which is unique for a transistor preamplifier.


Preamplifier stage

Frequency response + 0 / – 3 dB

0,5 Hz – 300 kHz

Signal / noise ratio

108 / 112 dB

Total harmonic distortion

< 0,001%


< 0,001 %

Channel separation

> 108 dB

Unbalanced inputs (RCA)

7 x 250 mVeff ... 9 Veff / 20 kOhms

Balanced inputs (XLR)

4 x 500 mVeff ... 18 Veff / 5 kOhms



50 Ohms high current

1 x Recorder

250 mVeff / 100 Ohms


Nom 1 Veff, Max 9,5 Veff / 50 Ohms


Nom 1,45 Veff, Max 19,6 Veff / 50 Ohms

Reservoir capacity

75000 μF

Mains / Accessories / Dimensions


2 x 110 - 120 V/60 Hz or 220 - 240 V/50 Hz,
10 + 60 Watts rated current consumption


< 0,5 W


Trigger input +5 ... 20 V for external switching-on
input 4 can be configured in surround mode
analogue signal processing module
slot for optional phono content_default MM / MC

Remote control

F 3001


2 x power cord, remote control receiver E 2000

Dimensions (H x W x D)

17 x 46 x 46 cm


28 kg / 61.7 lbs


case: silver laquer 47 or titanium laquer 64
heat sink black 42

Technical modifications reserved



Catalogue HV Series
Catalogue P 3100 HV

User manual

User manual P 3100 HV
User manual phono amplifier

HVEQ Software for room calibration

Usre manual HVEQ
Equalizer Measurement Sheet
Software HVEQ
Audio Test Signals

Firmware / Driver

Versions info


Tracking Angle 8/2023


As I usually do, I wondered who the customer might be for this beast of German engineering. I think the P 3100 HV preamplifier will appeal to audiophiles who want a great-sounding preamplifier, but especially to those who don’t want to sacrifice a lot of cool features for summit-level sonics.
I’ve heard cassettes are coming back. Reel-to-reel tape has undoubtedly made a splash in recent years. A separate record-out and monitor-in is a recipe for good times making mix tapes. Wanna eq those headphones a bit for late-night listening? Do you have a lot of source gear with a variety of connections? Do you have a prominent room acoustics issue you’d like to correct when using digital and analog sources? Want to enter or upgrade your vinyl playback but don’t feel like adding a big-ticket phono pre to the budget?
The P 3100 HV does all this and more while acting as the high-resolution/high-musicality heart of an audiophile system.

Highly recommended.

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Future Audiophile 12/2022

P 3100 HV Pre-amplifier Review

To say I was completely and thoroughly impressed with the P 3100 HV is an understatement. Its musical presentation was a joy to behold even right out of the box. Well, not a box, really. It is shipped in a metal and wooden flight case, further evidence of T+A’s commitment to quality. When you consider the retail pricing to the features, and best of all the incredible performance, you’ve got a real player in the ultra-high-end audiophile market. Does anyone truly need to spend this kind of cash on a stereo preamp? Of course not. The problem is, once you hear it and put your hands on it, you will want to.

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Hifi News 10/2020

T+A P 3100 HV
I had an absolute ball with this preamp, combining as it does
a remarkably ‘straight through’ sound with quality throughout,
from design to engineering to styling and finish. I might swerve
the ‘match my car’ paint options, but otherwise there’s nothing not
to like here. It looks – and sounds – a million dollars, and is as much
a pleasure to use as it is to listen to and with. Clearly the theory
has been well applied here.

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Audio 8/2020

Diesen Vorverstärker nicht mit Endstufen der absoluten Top-Klasse zu verbinden, wäre Perlen vor die Säue. Der T+A P 3100 HV treibt die analoge Signalaufbereitung auf die Spitze, die mindere Nach-Spieler, übrigens auch Lautsprecher, gnadenlos aufspießt. Wenn aber alles passt, dann verschafft dieser nun wahrhaft nicht billige Vorverstärker aus deutscher Entwicklung und Fertigung musikalische Erlebnisse ungeahnten Reichtums. Erstaunlicherweise sogar mit aufnahmetechnisch mediokrem Material. Dessen Schwächen zeigt er zwar unbestechlich auf, doch dem Wesentlichen, der Musik, verleiht er wahrhaft strahlende Energie. Dieses Zentralgestirn lässt die Sonne aufgehen.

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Stereo 7/2020

Einen draufgesetzt
Die harte Arbeit in Herford hat sich jedenfalls unbedingt gelohnt. Eine wie auch immer geartete HiFi-Komponente so klangneutral und dennoch so voller emotionaler Qualitäten zu entwickeln ist ein Kunststück, das nur den Allerwenigsten gelingt. Dies zu einem erheblichen, aber im Vergleich zur sonstigen Weltelite fast schon günstigen Preis geschafft zu haben, geht über einen perfekt einstudierten Trick weit hinaus. Es grenzt benahe an ein Wunder!