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by Response Audio

Musica Bella by Response AudioMusica Bella by Response AudioMusica Bella by Response Audio

Musica Bella
by Response Audio

Musica Bella by Response AudioMusica Bella by Response AudioMusica Bella by Response Audio
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    • Home
    • Product Lineup
    • Spirito 2A3 Linestage
    • Foundation Linestage
    • Package Clearance Deals
    • For Sale Items
    • MB300H Tube/GaN FET Amp
    • Master DHT/GaN FET
    • Single Ended Amplifiers
    • Harmonia v3.1
    • Gallery
    • The Original Reference
    • Our Friends

  • Home
  • Product Lineup
  • Spirito 2A3 Linestage
  • Foundation Linestage
  • Package Clearance Deals
  • For Sale Items
  • MB300H Tube/GaN FET Amp
  • Master DHT/GaN FET
  • Single Ended Amplifiers
  • Harmonia v3.1
  • Gallery
  • The Original Reference
  • Our Friends

Foundation v3 Tube Linestage 2025

Tube linestage based on the 6922 dual triode. Tape loop and capacitor selector. Choice of face plate material and options on clearance chassis while they last. See below for clearance chassis. Contact us for special pricing on remaining chassis.

A perfect companion to b the MB300H or DHT/300 GaN FET Hybrid amplifiers.

Inquire

Foundation Preamplifier

The 6922 based Foundation is a single ended tube preamplifier designed around the 6922 (footnote 1) dual triode. The design goal of the Foundation preamplifier was to provide an audiophile quality at an affordable price.

Remaining amplifiers have two large vent holes on the top of the chassis with pure copper mesh for ventilation. 


The Foundation line preamplifier is designed to complement most power amplifiers available including tube or solid state design. The new capacitor selection allows you to choose the coupling capacitor size to best match your amplifier or provide a high pass filter to take the load off your power amplifier when using a powered subwoofer.

The power supply is of usual Response Audio quality. A high quality toroidal transformer feeds a solid state CLC (choke filtered) design utilizing polypropylene filter capacitors. Tube filaments are powered by a separate regulated DC supply.

The circuit is designed  in such a way as to have a maximum tube life for the 6922 tubes.

The preamplifier has more than enough output for any power amplifier, transistor or valve, and is ideal for driving long interconnect cables to remotely located power amplifiers due to its low output impedance.


Standard Chassis is black anodized aluminum 16" x 16" x 5.5" with laser engraved aluminum front panel.

See pricing below.


MB Foundation Preamplifier


Features

  • Aluminum chassis with laser engraved acrylic front panels
  • Neutrik RCA connectors
  • Alps remote volume control w/Mute
  • Tape Monitor Loop
  • Capacitor selector switch
  • Audyn Plus input/output coupling capacitors (standard)
  • DC Offset Protection
  • Enhanced ground scheme
  • Polypropylene power supply filter capacitors
  •  Solid state choke filtered power supply employing a high current toroidal transformer with a separate transformer used to drive the remote volume control and input selector


Technical Specs

  • Tube Complement: (2) 6922 driver tubes
  • Three sets of RCA line inputs 
  • Two sets RCA main outputs - Effected by CAP mode (see below)
  • One set of full range Preamp outputs. Can be used to power any other external power amp including subwoofers
  • One set Tape input
  • One set of Tape output
  • Gain: 10dB
  • Input Impedance: 100Kohms.
  • Output Impedance: 
  • Frequency Response: 
  • Dimensions: 16Wx16Dx4.5H w/footers
  • Weight: 
  • Direct Selling Price: $3,995 Bronze or Dark Gray Acrylic

                            

  • Warranty: 2 years parts and labor. 90 days on tubes.


Footnote 1: The Foundation circuit is applied in a way that allows the use of the 6DJ8 tube without any abnormalities. 


 CAP - This feature allows you to choose the output coupling capacitor arrangement

  • Full - This setting utilizes the single output capacitor for full range response
  • High Pass - This setting utilizes a single, small value, high quality capacitor providing a high pass filter output. High pass frequency is based on the input impedance of your amplifier.
  • Combine - This setting allows the full range capacitor to be fitted with the High Pass capacitor as a bypass.

TAPE - Allows the use of an EQ, Processor, Tape unit, and of course our Harmonia v3 DHT tube stage

Rear Panel Layout

Foundation prototype with Bronze Acrylic Front Panel

Copyright © 1996 -2025 Response Audio NY - All Rights Reserved.

  • Spirito 2A3 Linestage
  • Foundation Linestage
  • Package Clearance Deals
  • For Sale Items
  • Master DHT/GaN FET
  • Single Ended Amplifiers
  • Harmonia v3.1
  • Gallery
  • The Original Reference
  • Our Friends
  • Customer Gallery

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