Music Reference

Music Reference RM-245.1

With RCA Globe 45s
and EM7 preamp.
With Emission Labs Mesh-45s With KR PX4's
(Click to enlarge)

Just completed!!!

Music Reference's first single ended amplifier. We chose the 45 for its extremely transparent midrange. Unlike most 45 amps that achieve only 2 watts per channel, we achieve twice that with no added stress on the 45 (this statement applies to all 45 tubes, even the old globes). Please visit this page often for further details.

Click Here to see power output of the RM-245 with different tubes.

Click Here for a picture of the RM-245 rear plate.

The RM-245 is available with a choice of several different knob styles, as seen Here. The knob to the far left is available only in limited quantities, as it is antique and no longer produced.

RM-245 FAQ

Q: How do you get twice the power without hurting the tubes?

A: Roger A. Modjeski, our designer, has always created new applications for tubes in his amplifiers and preamps. These applications are generally not the ones given in the RCA tube manual that most other designers use. Those applications are only suggestions and are not the final word. The range of possible applications is limitless and Roger enjoys exploring this realm creating new applications. The standard application of the 45 results in 10 watts of dissipation. This later became the rating for the tube. Interestingly enough, plate dissipation is not given in the early manuals. Roger has the complete set of RCA manuals from RC 11 to RC 29. In the RM-245 Roger’s application uses a slightly lower plate current and a slightly higher plate voltage with the average dissipation being 8 watts. The common RCA application is 10 watts (the maximum recommended). One of Roger’s conditions is always to run below max dissipation in all his amplifiers.



Music Reference RM-245


(Click to enlarge)
The RM-245 is a 45 Amplifier, capable of delivering 5 Watts per side. Perfect for a small to medium listening room, the RM-245 is a very effective amplifier with unparalleled sonics in it's price range. This amp has received very good reviews in Audiophile Voice magazine.

At Music Reference we are sometimes astounded at the waste and inefficiency of many current audiophile products. Whether a watt wasting, tube burning, distortion ridden, single ended design or a heat billowing silicon monstrosity, the concept and practice of waste and faddishness are anathema to our design practices. That’s why we were willing to devote four years of intensive research and development to the RM-245. It is our response to the failed efforts of others to produce an amplifier that at once sets standards of low cost, solid power output and wonderful musicality.

In a world where 2 watts from a 45 was considered the limit, designer Roger A. Modjeski has endowed the RM-245 with 5 watts from the very same pair of tubes. More good news is found in the eco-friendly nature of the RM-245 which uses only 1/10th of a Watt of precious electricity at idle. This convergence of economy and efficiency is further evidenced by output tube life that exceeds 10,000 hours. The RM-245 is a product for the music lover who appreciated the subtlety of music as well as its grandeur. Its 5 watts per channel will drive many of today’s loudspeakers to realistic levels in all but the largest rooms.

We invite you to celebrate the RM-245; to view its subtle lines and glowing charm, as well as to wade in its simple, truthful way with music. Let it be your partner in the appreciation of music and the combined art and science of amplifier design. In an era where mediocrity and waste are common, we offer you an experience of utmost quality and enduring value.

Please feel free to contact us for more information about the RM-245.

RM-245 and RM245.1 Specifications

Power Output:
5 Watts RMS per channel.

Distortion:
Less than 1% from 50 Hz to 10 KHz up to rated power.
THD is typically 0.08% at 16
Watts and 0.06% at 10 watts.

Hum:
0.35 millivolts of hum

Noise and Hiss:
0.2 millivolts

Frequency Response:
-3 dB at 8 Hz and 50 KHz.

Inputs:
Gold plated Tiffany® RCA jacks
Input impedance = 100 K ohms.

 

Power Bandwidth:
-3 dB from 29 Hz to 40 KHz.

Outputs:
4 and 8 ohm with 1/2" solid brass hex head posts.

Damping Factor:
12.5. The RM-10 is unconditionally stable

Sensitivity:
950 millivolts for full power

Tube Complement:
2 - 45's
2 - 6GH8

Each unit is hand wired
with point-to-point wiring

Net Weight:
14 Pounds

Price:
Pricing






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