The RM-10 is a 6BQ5 / EL84 Amplifier, capable of delivering 35 Watts per side. Perfect for a small to medium listening room, the RM-10 is a very effective amplifier with unparalleled sonics in its 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-10. 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 17 watts from a pair of 6BQ5 was considered the limit, designer Roger A. Modjeski has endowed the RM-10 with 35 watts from the very same pair of tubes. More good news is found in the eco-friendly nature of the RM-10 which uses only 70 Watts 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-10 is a product for the music lover who appreciated the subtlety of music as well as its grandeur. Its 35 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-10; 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.

The RM-10 MK2 has improved output transformers which yields lower distortion at the higher frequencies and midrange, resulting in more detail. The RM-10 MK2 also features larger binding posts, which are now 1/2 inch. High quality components (such as Dale resistors) have also been incorporated into the RM-10 MK2.

>> RM-10 design philosophy

Power Output:
35 Watts RMS per channel.
70 Watts RMS Mono.

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:
Less than 250 microvolts
(0.25 millivolts) of hum¹ (see below)

Noise and Hiss:
Typical 40 to 80 microvolts²
(see below)

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

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

  Power Bandwidth:
-3 dB from 29 Hz to 20 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 Matched Pair 6BQ5/EL84;
2-12AX7

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

Net Weight:
14 Pounds

Dimensions:
13x10x5 inches

  1. Most audio amplifiers do not spec their hum; those that do are not even close to this figure

  2. Noise and hiss is dependent on the 12AX7 driver tube; for very low noise (40 microvolts or less), you can use our Super Low Noise (SLN) 12AX7 tubes


The Virtues of Power Tube Matching

Some amplifiers don't have enough range on the bias pots to handle the range of tubes so that selection must be made from a particular part of the curve to achieve bias. In the "good old days," I'm told, the spread of values was much less, allowing reasonable performance with random selection. Today, however, random selection is certainly not recommended.

Read article

Tube Improvements: Emmission Labs

These tubes are full-wave rectifiers of a special kind, and electrically equivalent to the original Western Electric historical tubes. The series connection makes the middle of the filaments to be virtually grounded, when using a filament supply winding with a center tap.

View tubes

Meet Roger Modjeski

"When I select a product, I consider that I am buying the experience and knowledge of the designer who conducted or led the engineering on the product, along with the skills of the people who crafted it..."

Read Roger's bio





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