Frankenstein 300B Stereo Amplifier

Frankenstein 300B Stereo Amplifier Frankenstein 300B Stereo Amplifier

Coincident is excited to introduce the newest addition to our series of power amplifiers - the Frankenstein 300B Stereo Amplifier. The Frankenstein 300B Stereo amplifier is the stereo version of the highly acclaimed Frankenstein M300B Mono Amps. The two Frankenstein amps share the exact same mirror finish stainless steel chassis, virtually the same design and circuitry and industry breakthrough performance. The differences are the Stereo amp uses the 6SL7 input tube instead of the 6EM7 and utilizes the 5AR4 rectifier instead of the 5U4GB. Both are all hardwired share the vast majority of components. The Frankenstein Stereo 300B will be the best constructed, finest performance and best value of any single ended 300B available. It represents a breakthrough at its reasonable price point.


Output Power - 8 watts RMS SE class A
Output Impedance - 8 ohms
Frequency Response- 10hz- 20khz- +/- 1db
THD- less than 1% 20 hz - 20 kHz
Input Sensitivity - 800 MV full output
Input Impedance - 47K ohms
Power Requirements- AC 115V or 230V 50,60hz ( user selectable on the rear panel)
Dimensioin - 15” W x 12” D x 8.5” H
Net Weight - 17 kgs- 38 lbs.
Tube Compliment - 6SL7 x2, 300B x 2, 5AR4 x 1.

Price - $2499 US, All tubes included except 300B.


Dynamo 34SE MKIII

Replaced By The New Frankenstein Stereo 300B Amplifier

2023 the absolute sound editors choice award

2019 TAS Editors' Choice Awards

Dynamo Mk III Amplifier

2020 the absolute sound - Editors' Choice Awards

2019 TAS Editors' Choice Awards

Dynamo Mk II Amplifier

2019 the absolute sound - Editors' Choice Awards

2018 Positive Feedback Writers' Choice Award

2018 Positive Feedback Writers' Choice Award

Dynamo Mk II Amplifier

2018 Positive Feedback Writers' Choice Award

The Absolute Sound 2019 Annual Edition

Dynamo Mk II

High-End Audio Buyer's Guide Award

Coincident Dynamo MK II Amplifier

2018 The Absolute Sound

Dynamo Mk II Amplifier

2018 the absolute sound - Editors' Choice Awards

The Absolute Sound

Dynamo MK II Amplifier

2018 Buyer's Guide - Top Amplifiers Under $2000

2017 TAS Editors' Choice Awards 2016 TAS Editors' Choice Awards 20/20 Award Best Of 2013 Blue Note Equipment Awards
Coincident speaker - Dynamo 34SE Coincident speaker - Dynamo 34SE Coincident speaker - Dynamo 34SE
Dynamo 34SE MKIII
Dynamo 34SE MKIII

After the overwhelming success of the Coincident Dynamo 34SE MK II amplifier ( Editor’s Choice TAS, Blue Note Award by , Positive Feedback ) we are excited to announce the Dynamo SE 34 MK III. The MK III contains a whole host of significant upgrades that not only enhance performance but dramatically improves reliability, virtually eliminates noise, hum and susceptibility to AC line variation and fluctuation. The end result is taking the already breakthrough performance and build quality of the finest value amplifier in existence and elevating it to a new level of excellence in every parameter. The most noteworthy change offered by the MK III, is the introduction of 2 inputs selectable from the front panel. The improvements include the following:

1. Power Supply - The power transformer has been enlarged by 50%. Much improved insulation and winding techniques result in noiseless operation, and a 40% reduction in generated heat levels.
Filtering and energy storage has been increased by a whopping 70%. The sonic improvement is substantial- deeper, more impactful lower frequencies, wider and the ability to drive a much wider range of speakers without strain. Distortion levels at high SPLs and low frequencies has been reduced by 35%. Furthermore, the large power supply has now been isolated from the sensitive input circuitry resulting in the elimination of electromagnetic interference.

2. Chassis - Not only is the chassis 20% larger in order to accommodate the huge new power transformer, it has been stiffened and braced to reduce unwanted resonances. Sonically this translates to greater purity and transparency. The Dynamo has gone from weighing 22 lbs to 30 lbs.

3. Capacitors - Every single capacitor has been doubled in voltage capacity which provides bullet proof reliability and eliminates potential problems in areas afflicted with high AC line voltage that is prone to surging and/ or fluctuation.

4. Tube Rectifier - The previously used instant on 5U4GB rectifier tube has been replaced with the soft start 5AR4. This provides a safeguard against excessive inrush current upon turn on.

5. Two Inputs - The MK III has now been transformed into a stereo integrated amplifier. Toggle switch selectable on the front panel are the 2 inputs.

The overall improvement wrought by the MK. III is highly significant. From virtually eliminating noise so that the Dynamo can successfully be used with ultra high sensitivity speakers and increasing its power capabilities so that it can mate with a wider range of lower sensitivity speakers to unshakeable reliability in any environment to stunning performance enhancements that include deeper, punchier bass, greater transparency and purity overall, more expansive soundstage and greater extension and air in the treble all combine to create an amplifier that while is hard to surpass at $5000, is unmatched at its value laden price of only $1799 US. While the Dynamo 34SE MKII at $1499 US was considered the finest value in all of high end audio, all the huge and costly improvements incorporated in the MK. III with only a $300 increase in price, make the even more of an audiophile bargain.

For those on a budget but who still demand top flight sonics and build quality, the Dynamo will prove to be a revelation. Single ended triode tube sound that belies its 8 watt power rating. Any 86 db sensitivity speaker can be powered with startling clarity and dynamics. Build quality not seen at twice the price. Perfect for those who want a simple compact set up or as a second system where true musicality is insisted upon. Hard to believe that this much performance and quality can be had for under $1800 US. Volume control and 2 inputs front panel selectable turns the MKIII into a stereo integrated amplifier obviating the need for a line stage and includes a highest performance headphone amp with phono jack conveniently located on front panel.

- All hard wired.
- Huge capacity power supply
- massive power transformer
- output transformers using 6N copper windings
- polypropylene coupling capacitors
- all electrolytic capacitors 50% over rated.
- state of the art headphone amp included
- high gauge stainless steel,mirror finish chassis
- auto bias circuit to automatically optimize tube performance

Inputs: 2 RCA - front panel selectable
Output Power : 8 watts per channel
Tube Compliment : 6H9C (6SL7) -2 input/driver tube, EL 34 (2) output tube, 5AR4(1)soft start rectifier
Output impedance : 8 ohms
Voltage selectable: 115V/230V - switch located on bottom plate
Frequency response: 20 hz- 20khz- flat
Sensitivity: 300 mv full output
Input impedance : 100K ohms
Headphone Amp Output Impedance : 100 ohms
S/N Ratio- 92 db
Weight: 30 lbs
Dimensions : 9.5” W x 12.5” D x 7” H
Price: $1799 US

The Dynamo MKIII is now available on special order optimized for 300B output tubes instead of the EL 34 which is still standard. The Dynamo MKIII will now exhibit all the finest sonic qualities of single ended triode 300B output. Compared to the Dynamo SE34, power output remains the same. Gain is slightly lower which is especially well suited for high sensitivity loudspeakers. The new Dynamo SE 300B MK III will easily exceed the performance of comparable SET amplifiers costing many times its reasonable selling price. For those wanting to buy the M300B Frankenstein amps, but require something more compact in a single chassis with a state of the art headphone amp and a line stage with 2 inputs, at a more affordable price, the new Dynamo 300B is impossible to equal.

Price - $2295US - without 300B tubes.

For owners of Dynamo MKII, converting your unit for 300B output operation, is now available.

Price: $699US without 300B tubes
           $875US with Psvane matched and tested Clear Glass 300B tubes.

Dynamo 34SE MKIII


M300B Frankenstein MK IV

2023 the absolute sound editors choice award

2018 TAS Editors' Choice Awards

2020 the absolute sound - Editors' Choice Awards

2019 TAS Editors' Choice Awards

2019 the absolute sound - Editors' Choice Awards

2018 TAS Editors' Choice Awards

2018 the absolute sound - Editors' Choice Awards

2017 TAS Editors' Choice Awards 2016 TAS Editors' Choice Awards TAS 2013 - The Absolute Sound Editor's Choice Awards Stereomojo Recomendation

M300B Frankenstein MK III - This is , without a doubt, the finest amplifier, overall, I have ever heard. - Arthur Salvatore- High End Audio

Coincident speaker - M300B Frankenstein MK II Coincident speaker - M300B Frankenstein MK II Coincident speaker - M300B Frankenstein MK II Coincident speaker - M300B Frankenstein MK II

As of Aug.1/2022, Coincident is excited to introduce the MK.IV version of the Frankensteins. Improvements include:

- Enlarged power supply capacity- deeper, more impactful bass
- Improved voltage regulation- immune to AC voltage fluctuations
- Improved resistors and capacitors which results in greater revelation of low level detail and airier, more extended high frequencies
- Coincident Quantum Leap internal wiring which enhances purity and transparency.
- Upgraded output transformers with a flat frequency response from 10 hz- 30khz.

The Frankenstein MK IV are even more transparent, with extended frequency range, enhanced dynamics, punchier, tighter bass and are absolutely dead silent.Perfect match with ultra high sensitivity speakers ( 100db or higher) due to the total absence of residual noise.

The M300B Frankenstein MK IV mono amplifiers are ready for pre order with . Built to the absolute highest standard - Stock will be available Oct./2022

- Triangular chassis constructed from high gauge stainless steel -mirror polished finish- maximum non resonant, highest rigidity and non magnetic
- All hardwired with Coincident Quantum Leap cable
- The finest 6N copper interstage (no coupling capacitor), output and power transformers
- Finest Teflon caps
- Massive all polyproylene power supply- no electrolytics
- Precise Auto biasing which maintains optimum operating bias as tubes age
- 3 tube configuration (6EM7 input driver, 300B output, 5U4GB rectifier) for purest sonics
- Input tubes are the best NOS American. Comes standard with the finest quality, tested 6EM7 and 5U4GB tubes.

These amps represent a sonic breakthrough. Their transparency and absence of an electronic sound set new standards. Mated to the appropriate speakers, they will prove to be a revelation. They easily drive every Coincident speaker model.

MK IV Specifications

Output Power: 8 watts RMS -(Triode) / SE Class A
Output Impedance: 8 ohms- Optimized for 8-16 ohms.
Frequency Response: 10hz - 20khz ±1db
T.H.D.: <1%, 20hz-20khz (Ref. Output)
Input Sensitivity: 700mv
Input Impedance: 100k ohm
S/N: >90db
Tubes: (6EM7×1, 300B ×1, 5U4GB ×1) / Channel
Power Requirement: AC 115v Or 230V - 50/60hz (User selectable on back panel)
Dimension: 15" W x 12" D x 8.5" H
Gross Weight: 19 Kgs- 41.8 lbs.
Net Weight: 17.5 Kgs - 38.5 lbs.
Price - $6899 US /pair

Coincident speaker - M300B Frankenstein MK II


211PP Dragon MK. II

211PP Dragon MK. II Mono Amplifiers - This is the finest high power amplifier I've ever heard. In short, my associates and I hear a combination of sonic strengths we've never heard before. - Arthur Salvatore- High End Audio

We are now excited to introduce the MK. II version of the highly acclaimed Dragon amplifiers. The improvements include:

1. Dual power transformers in place of the previously used single unit. The new transformers individually possess the capability of powering the amplifier. In tandem, they are coasting only using less than 25 % of their rated capabilities. The result is a far cooler operating amplifier, thereby improving reliability and long term
stability. Additionally, the Dragon is now virtually noiseless. It is incredibly quiet which is a remarkable feat for an amplifier this powerful operating at such high voltages. Sonically there is an improvement from top to bottom. The bass is tighter, deeper and punchier. The mids and highs are more transparent and the soundstage more expansive. Due to the reduction in noise, overall revelation of low level detail is enhanced.

2. Chassis Rigidity - To accommodate the dual transformers of the MK. II Dragons, the chassis has been enlarged by 20%. The amplifiers are now 2" wider and 2" deeper and 1" higher. They now weigh 85 lbs, which is 20 lbs heavier than the previous model. The chassis is now more rigid which results in the virtual elimination of chassis induced resonances. The MK. II now utilizes 6 ceramic isolating feet to stabilize the unit.

3. The standard supplied 211 tubes will now be the exceptional Shuguang Pevane. They represent a marked sonic improvement over the previously supplied standard Shuguang. The Pevane is also more durable and reliable and runs 15% cooler.

4. AC ground lift is now included. This switch conveniently eliminates hum created by AC ground loops.

The MK. II Dragon is now the finest sounding, high power amplifier in existence. Its purity is within a hair's breath of the finest SET 300B amplifiers (the Frankensteins) yet its power delivery is awe inspiring. It also runs cooler and is exceptionally quiet.

Coincident Speaker - 211PP Dragon Mono Amplifiers Coincident Speaker - 211PP Dragon Mono Amplifiers Coincident Speaker - 211PP Dragon Mono Amplifiers Coincident Speaker - 211PP Dragon Mono Amplifiers

The purity, transparency and continuousness of a DHT SET but with the power, explosive dynamics, weight and impact of a huge push pull pentode amplifier - sounds mutually exclusive, not any longer. The 211PP Dragon mono amplifiers are such a creation. These amplifiers are absolute state of the art in terms of components selected, circuit design and execution and construction quality. This is unique among high power, push pull DHT triode amplifiers. There has never been a high power, DHT amplifier built to this standard with sonic performance at this level. The Dragons are capable of driving even the most difficult speaker loads.

Latest version of the Dragon MK II ( Jan.1/19 shipping) include the following improvements:

-Dual power transformers per amp to ensure low noise, cool operation and unlimited power reserves
-The finest 6N copper interstage (no coupling capacitor), output and dual power transformers
-Tube compliment- 6EM7 super tube for input- So much current capability it has its own power supply
-300B Driver Tube for utmost purity ( no pentode tubes used in this DHT design)
-Dual 211 Shuguang Pevane output tubes in a push pull configuration which dramatically lowers distortion and provides huge power reserves. (over 300 watts of peak power- 80 watts continuous- sounds more like 250 watts)
-Teflon caps use in cathode bias circuit
-Massive power supply- caps are all 1500V polypropylenes- no electrolytics
-Highest quality discrete resistor potentiometer permit the direct connection of a CD player thereby obviating the need for an expensive line stage or for use in a biamped system
-Binding posts are Coincident 6N copper, .25" solid post
-Auto bias maintains optimum bias as tubes age
-All resisters are 1% tolerance and none less than 2 watts
-All meticulously hard wired using Coincident Statement cable

The sonic improvements include:

-Tighter, punchier and more impactful bass and mid bass
-Wider dynamic gradations
-Airier, more extended and smoother high frequencies
-Harmonic completeness that rivals the finest 300B SETs
-Enhanced transparency and purity.


211PP Dragon MK. II Mono Amp
Output Power: 75 watts RMS - 300 watts peak (Triode) / Push-Pull Class A-
Output Impedance: 8ohm
Frequency Response: 20hz-20khz ±1db
T.H.D.: <1%, 20hz-20khz (Ref. Output)
Input Sensitivity: 700 MV
Input Impedance: 100k ohm
S/N: >90db 
Tubes:(6EM7×1, 300B×1, 211×2)/ Channel
Power Requirement: AC 115v Or 230V 50/60hz (User selectable on back panel)
Dimension: 11.5 " W x 20.5 " D x 10 " H
Gross Weight: 90 lbs - 41 Kgs
Net Weight: 85 lbs- 38.5 Kgs
Price - $10,999 US/pair

211PP Dragon Mono Amplifiers


Joules refers to the amount of energy storage that is in the filter capacity of the power supply of an amplifier. The higher the number, the better and the greater the headroom or power reserves that are available to power a given speaker.For example, 2 amplifiers may be rated at 28 watts RMS. However, when the output signal peaks above the 28 watt output, the amplifier with the higher Joule rating will be more resilient in avoiding clipping distortion and will possess the ability to provide greater headroom ( the difference between the signal peak levels and the amplifier’s clipping level). Peak power depends on the amplifier’s power supply ( energy storage). If the amplifier’s power supply has a bank of large filter capacitors, it can store energy that can be released during short peaks and avoid clipping or distortion. Therefore, the 2 amplifiers rated at 28 watts continuous output are not equal in their respective ability to produce the required peak signals.The one with the larger Joule rating will be more capable in accurately reproducing the peak signals without clipping.

Power Supply Energy Storage - Joule

Dynamo MK II - 8 watts RMS - Joule - 52
Frankenstein M300B MK III- 8 watts RMS - Joule -140
Dragon MK II - 75 watts RMS - Joule -920
Turbo Monos - 28 watts RMS - Joule -975

For comparison purposes - Comparable Amplifiers-

8 watts RMS SET tube amplifiers - Joule - 20
75 Watt RMS Triode Tube Amps - Joule -100
28 Watts SET Tube Amps - Joule- 65

As the above clearly demonstrates, Coincident amplifiers are designed with massive energy storage capabilities (significantly using polypropylene filter capacitors exclusively) and as a result, sound much more powerful than their wattage ratings suggest.


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