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Tuesday, April 2, 2024

The Intrepid Power Amplifiers


A pair of Intrepid Power Amplifiers is finished.

In a previous prost I already introduced the concept of the Intrepid product line and showed a pre production model.

This pair of power amplifiers represents the first of the Intrepid series.

The amps are similar in concept to the Heritage Power Amplifiers, but everything is upgraded to the maximum.

That is in detail: All signal relevant transformers are custom silver wound. Each of the chassis is milled from a solid block of metal for a seamless surface. This includes the separate power supply which has its own chassis:

The high voltage is tube rectified with a full wave bridge. The 4 rectifier tubes are mounted horizontally inside the PSU chassis. Each voltage is choke filtered, including the DC filament supplies.

And as a unique speciality, custom tubes exclusively made by Deutsche Elektronenröhren Manufaktur GmbH for the Intrepid series of amplifiers:

The tubes on the photo are pre production tubes. The first series production batch is in preparation.
The amplifiers produce 10W per channel with these tubes.

Alternatively the Intrepid amplifiers can be ordered for different tubes, for example TM801A and TM300B which can also be used with old production 801A tubes, which are also available from me on request. Any 300B compatible output tube can be used. In that configuration 7W are available per channel.

Like the Heritage Amplifiers, the Intrepid series can be configured to work with a variety of output and driver tubes, for example 45 drives 45, 46 drives 46. These would be 2W per channel (45) or 1.25W (46).

10 drives 45 shown above, also possible UX201A or 26 drives 45.

801A or 10Y drives 2A3 for 3.5W per channel:

Many options are possible and I have many NOS tubes in stock to choose from. The amps can also be reconfigured for different tubes after the purchase for a moderate fee. All tubes which are supplied by me for Intrepid amplifiers are guaranteed for 5 years.

The units are designed such that the amplifier can be stacked on top of the power supply.

The set of 4 chassis:

Each chassis is 434 by 434mm (plus knobs and connectors), 100mm high (plus feet).

The amps shown here have a brushed surface.

Alternatively glass pearl blasted surface is possible as well as black anodisation.

Other colors on request.

Also different style feet can be ordered.

And pretty much any customisation as long as it is technically feasible.

The matching line and phono preamplifiers are in  preparation as well as a DAC. Stay tuned!

These amplifiers will be demoed at the Munich High End, May 9th-12th, Hall 2, F06. See you there.

Best regards



  1. Hallo Thomas, perfekt aus einem Guss😍
    Die mit Abstand schönsten Röhrenmonos ever, so clean echt ein Traum den du da erschaffen hast.
    Grüsse Hannes Schrotter

  2. Hello, Thomas!
    Could you please clarify what type of interstage connection you are using in a design where the UX201A is the drive?r. If this is a transformer, which one?
    Best regards,

    1. Hi Dmitry, if a customer has his own technical requirements how this should be implemented to his taste, this can be done as long as it fits my design philosophy and is technically feasible. I have a variety of transformers in stock including access to custom wound.