# Modwright

> ModWright Instruments is an American maker of tube and hybrid amplifiers, preamplifiers and phono stages, founded in 2000. Audio Exchange is its official South African distributor.

URL: https://audioexchange.co.za/our-portfolio/importer/modwright/
Published: 2026-10-29 | Updated: 2026-10-31
Source: Audio Exchange (https://audioexchange.co.za/)

## Key points

- Founded in 2000 in the USA, starting with modifications to digital products
- 9.0 series preamplifiers introduced in 2003; KWA 150 amplifier released in 2009
- Range includes the KWA 300 Reference power amp, KWA 99 monoblocks, LS 99 and LS300 tube preamps, KWH 225i hybrid integrated and PH 150 phono stage

## Content

## Modwright Instruments

USA  ·  HIGH-END AUDIO INSTRUMENTS  ·  OFFICIAL SA DISTRIBUTOR

 

[Image: logo]

ModWright was founded in 2000 as a company producing modifications to digital products. The mods were cost-effective, yet high quality alternative to the audio enthusiast.

Born from this, our Truth series of modifications, utilizing tube analog stages, won ModWright worldwide acclaim and led us to the next step: building own equipment.

The 9.0 series of preamplifiers was introduced in 2003, continuing the trend of high performance audio with an emphasis on quality and value. This included a phono preamplifier and later a balanced tube linestage, the LS 36.5. In 2009 we proudly released the KWA 150 amplifier to round out a complete ModWright Electronics system.

We have continued on this path of building high quality and high value audio equipment, designed to provide the most natural and satisfying musical experience.

We pride ourselves as much on the quality of our work as on our level of service and customer satisfaction.

As founder of ModWright Instruments, I strive to maintain the message within our mission statement:

## Elegance. Simplicity. Truth.

## PRICELIST

## KWA 300 Reference Stereo Power Amp

**The KWA 300 represents more than twenty years of refinement in both solid-state and tube amplifier design.**

Our first amplifier, the KWA 150/150SE, received worldwide acclaim for combining the musicality and dimensionality often associated with tubes with the control, power, and resolution of solid-state design. At the heart of that amplifier — and every ModWright solid-state amplifier since — is the Solid State Music Stage (SSMS), originally developed by Alan Kimmel.

Over the years, every aspect of the design has been further refined:
greater power delivery, lower noise, increased precision, improved efficiency, and a more sophisticated overall aesthetic.

The result is the KWA 300 Reference Stereo Power Amplifier — a design created not simply to impress technically, but to reproduce music with effortless authority, natural flow, and emotional realism.

#### Technical Specs

**POWER RATINGS**
300W at 8 ohms.
550W at 4 ohms.

**FEATURES**
(2) RCA input.
(2) XLR input.
RCA and XLR inputs are transformer coupled to SSMS input stage with floated ground.
(2) Pair WBT Binding Posts – Positive (+) Red, and Negative (-) White. Not bridged.
(1) Internal Led On/Off Switch: Disables internal LED’s.
(2) 12V Trigger: External 12V input/output power on/off trigger.
Class A/B Operation. High Class A bias, but not pure Class A.
Dimensions: 18”W x 18.5D x 9”H – Height includes footers. Depth includes 1” binding posts.
Product Weight: 95 lbs / Shipped Weight: 110 lbs

**SPECIFICATIONS**
Gain: 30dB.
Frequency Response: 10Hz – 200Khz (+0, -1dB).
Input Impedance: 47K.
THD: < .02%

## KWA 99 Monoblocks

**POWER RATINGS**
100W at 8 ohms.
200W at 4 ohms.

**FEATURES**
(1) RCA input.
(1) XLR input.
RCA and XLR inputs are transformer coupled to input stage with floated ground.
(1) Pair 5-way Binding Posts – Positive (+) Red, and Negative (-) Black. Not bridged.
(1) Internal Led On/Off Switch: Disables internal LED’s.
(1) VU Dimmer Knob: Adjusts brightness of VU meter, to zero brightness.
(1) 12V Trigger: External 12V input power on/off trigger.
Class A/B Operation. High Class A bias, but not pure Class A.
Dimensions: 10.5”W x 6.5”H x 16”D – Height includes footers. Depth includes 1” binding posts.
Product Weight: 30 lbs / Shipped Weight: 35 lbs

## LS 99 Balanced Tube PreAmplifier

**FEATURES**
(2) XLR Fully Balanced Inputs.
(3) RCA Inputs.
(1) RCA HT/BP (Home Theater Bypass Input).
(2) XLR Fully Balanced Outputs.
(2) RCA Outputs.
Dual Remote 12V Trigger Outputs.
Remote Control: Volume, mute and trigger outputs.
Tube Output: 6922/6DJ8/7308/E88CC
Tube Rectified: 5AR4/GZ34 and Equivalents.
External Power Supply.

**SPECIFICATIONS**
Gain: 11dB.
Frequency Response: 20Hz – 150Khz flat.
Input Impedance: 30K.
Output Impedance: 100 ohm.
Noise Floor: -110dB (unweighted).
Weight: Preamp = 17 lbs. External Supply = 11 lbs.
Combined Shipping Weight: 33 lbs.

## LS300 Balanced Tube Preamplifier

**FEATURES: (Includes EXTERNAL Power Supply)**
Two sets of fully balanced XLR inputs.
Three sets of single ended RCA inputs.
One of the three sets of RCA inputs also serves as Home Theater Bypass.
Two sets of fully balanced main outs.
Two sets of single ended main outs.
 Theater Bypass (HT/BP) and Phase.
Tube Complement: (2)6dj8 (6922/7308) drivers and (2) 5R4GY (may use 5AR4/GZ34/5U4GB/5V4GB/274B and
equivalent) rectifiers.

**SPECIFICATIONS:**
Input Impedance: 20K
Output Impedance: 100 ohm
Gain: 11dB
Noise: -115dB
Frequency Response: 20Hz – 100Khz (-1dB at 100Khz).
Distortion: < .03% THD @ 1Khz.
Weight: Preamp = 30 lbs. External Supply = 17 lbs.

## KWH 225i Hybrid Integrated

**POWER RATINGS**
225W at 8 ohms at .04% THD.
400W at 4 ohms at .04% THD.

**FEATURES**
(3) pairs RCA inputs.
(1) pair XLR inputs.
(1) pair RCA Home Theater Bypass or Preamp Input.
(1) pair RCA Preamp-ouputs.
(2) Pairs 5-way binding posts.
(2) 6922 driver tubes (6dj8, ECC88, 7308 acceptable substitutes).
Product Weight: 64 lbs / Shipped Weight: 70 lbs

**SPECIFICATIONS**
Gain: 30dB.
Frequency Response: 20Hz-100Khz (+/-0dB).
Input Impedance: 20K.
Input Sensitivity: 2V rms.
Max input level: 6 Vrms (18V pk-pk).

**OPTIONAL SS PHONO STAGE**

## PH 150 Reference Phonostage

#### Technical Specs

MM/MC: 72dB max MC gain; 57dB max MM gain.

Loading: (6) resistive and (6) capacitance loadings via front panel control – on the fly!

Gain Adjustment: Front panel on-the-fly control of gain = 0dB, -6dB, -12dB attenuation.

Input Switching: MM/Mute/MC input switching on-the-fly via front panel controls.

Mono/Stereo Switching: Front panel controls.

XLR/RCA Output Switching: Rear toggle selects XLR (fully balanced) or RCA outs.

Power Supply: External, pure SS, via 4ft. umbilical.

Tubes: (2)6C45; (2)6922/6DJ8/7308

## LS 100 Tube Preamp

#### Technical Specs

**Tube Complement:** (2) 6SN7 driver tubes; (1) 5AR4 rectifier tube (may also use 5U4GB and 5V4GB).

Internal tube rectified, solid state regulated power supply.

**Features:** Four sets of RCA inputs.

One set of XLR inputs (wired single-ended).

Two sets RCA main outputs.

One set of XLR main outputs (wired single-ended).

One set of RCA Tape outputs.

One set of RCA Monitor Inputs.

One set of RCA Home Theater Bypass (HT/BP) inputs.

Two 12V remote trigger outputs.

**Gain:** 11 dB

**Input Impedance:** 38Kohms.

**Output Impedance:** 300 ohms.

**Frequency Response:** 20hz – 100Khz (+/-1dB).

**Max input signal level:** 10 Vrms

**Max output signal level:** 37 Vrms

**Headphone Amp Power:** 1.5 Watts (32 ohm – 600 ohm load).

**Phono Option:** MM/MC (Gain = 48dB/63dB).

Tube Compliment: (1)12AX7; (1)12AU7.

Loading: 50, 100, 500, 1K, 47K, 100pf.

Inputs: One pair RCA.

**Dimensions:** 17.75Wx17.5Dx6.5H

**Weight:** 25 lbs. (31 lbs. shipped)

## PH 9.0 / PH 9.0X /PH 9.0XT Tube Phono Stage

### PH 9.0 TUBE PHONO STAGE

We are excited to present the new PH 9.0 Tube Phono stage with on-the-fly loading and attenuation controls. Following in the footsteps and true Design DNA of the Reference PH 150, the PH 9.0 offers most of the same performance and flexibility of the PH 150 at a much lower price and smaller form factor.

### PH 9.0 “X” UPGRADE – LUNDAHL 1660S TRANSFORMERS!

**What the PH 9.0X upgrade includes:**
The upgrade to the PH 9.0X involves the addition of a pair of Lundahl gapped output transformers, commonly used in SET tube amps. The addition of these transformers also means the elimination of a pair of chokes and coupling caps, all in the signal path.

### PH 9.0 “T” UPGRADE – TUBE RECTIFIED POWER SUPPLY!

**What the “T” upgrade includes:**
The upgrade to the PH9.0 & PH 9.0X involves the addition of the tube rectified power supply. I have experimented with this for some time and after comparison to the stock solid state rectifier, found the benefits to be obvious and worthwhile. Again, back to our Reference PH 150 design, I also included a further high-voltage pre-regulator to the external supply, in addition to the tube rectifier. The ‘T’ upgrade then includes tube rectification and the high voltage pre-regulation stage.

#### Technical Specs

MC Gain: 64dB (58dB, 52dB)

MM Gain: 52dB (46dB, 40dB)

Gain Adjust: 0, -6dB, -12dB

Inputs: MM & MC

MC Loading: 10-20-50-100-250-470

MM Loading: 47K fixed.

Stereo/Mono: Rear Toggle.

Frequency: 20Hz – 50Khz (+/-.2dB)

Tubes: (2)6C45, (2)6922/6dj8/7308

Power Supply: External, solid state

Phono Dim = 10“Wx10“Dx4“H

Power Supply Dim = 7“Wx9“Dx3“H

Power Umbilical: 4-pin XLR, 6 ft

Balanced Outs: Transformer Coupled (add cost option)

## Analog Bridge

#### Technical Specs

Inputs: (2) pair RCA – Optional (1) pair XLR (add cost) balanced option.

Outputs: (2) pair RCA – Optional (1) pair XLR (add cost) balanced option.

Gain: Unity

Noise: -105dB (unweighted)

Frequency Response: (20Hz – 150Khz(-1dB))

THD: < .005%

Output Impedance:* < 20 ohm.

Dimensions: 10.5“W x 3.5“H x 14.5“D. (RCA length included)

Product Weight: 18 lbs

Shipping Weight: 23 lbs

## Frequently asked questions

### Who distributes ModWright in South Africa?

Audio Exchange is the official South African distributor for ModWright Instruments.