In the search for even more musicality we decided to go down the single ended route and found after hours of development and listening sessions the 300b was the way to go.
There is nothing like the musical sound of a single ended design, the simplified signal path lays bare all the information available from the source played (good and bad) and the triode design gives a true flat response through those terrible cross over elements in the speaker, the only criticism that seemed to be around of the design was poor frequency extremes, so we tackled this in our designs.
- Huge power supplies and transformers for bass extension with better control .
- Driver valves, resistor and capacitor selection for transparent high resolution, extending frequency extremes and in particular the output transformer design to keep the subtle high frequency information produced by the electronic design.
10 watts triode with split bobbin multi section output transformers 4 and 8 ohm taps, 0 feedback speaker 100 db and above required for best results.
In 2013 Jack Roberts reviewed the Diavolo on Constantine Soo’s Dagoga website, he said:-
“They all had an unmistakable “you are there” immediacy, yet with a touch more warmth than many SETs. Their amps satisfied those who desire a beautiful blend of harmonics, tonal colors and detail. The Diavolo TW Ref Signature I have in for review does not stray from this house sound much”.
He also said:-
“I was delighted to find that it sounded even more beautiful than I remembered. I was very impressed with how the Diavolo and Teresonic let the beauty and tone of this recording come through. It is without a doubt as realistic as I have heard recorded violin sound“.
You can read the whole review HERE
POWER: 10 WATTS
TYPE: SINGLE END 300b
FREQUENCY RESPONSE @1WATT: 5 HZ TO 20 KHZ + – 0.5 db
FREQUENCY RESPONSE @FULL POWER: 20 HZ TO 20 KHZ + – 1.5 db
INPUT SENSITIVITY: 450 mv
INPUT IMPEADANCE: 120 KΩ
OUTPUT IMPEADANCE: 4Ω AND 8Z
NOISE AT SPEAKER TERMINALS TYPICALLY: 0.8 mv
FEEDBACK 0 dB
CONSTRUCTION: HYBRID PCB / HARD WIRE
COMPONENTS: RESISTORS 1% METAL OXIDE, CAPACITORS LOW INDUCTANCE LOW ESR, COUPLING CAPS HOVLAND
TRANSFORMERS: MULTI SECTION SPLIT BOBBIN
RECTIFIER: VALVE GZ 37
DRIVERS: 6922 AND 12 BH7
HEATERS: DC REGULATED
SET UP : NO SET UP REQUIRED PLUG AND PLAY NO MATCHING ON POWER VALVES, MATCHING REQUIRED ON DRIVERS
Size: 18 inches wide, 14 inches deep, 8 ½ inches high
WEIGHT: 28 kg