Tube amplifiers with Tamura Transformers SE300B
Integrated SE300B with Tamura Transformers .
Dual switchable input and Handheld Volume Control. Excellent tone and very natural sound .
- Audiophile parts used throughout
- 300B Psvane standard or Gold LIon Genalex on order please refer to prices .
- Jupiter capacitors .
- Point to point Silver & Copper Foil wiring .
- 7N7 input tubes or 6SN7 .
- Tube rectified 5u4
- Excellent bass and high end sound response
- Tamura Output transformers 25Hz - 90 KHz frequency range
- Also available with our own NanoAT OEM output transformers ,
- Specifications below .
- 1dB :14hz-23Khz
- -2bB :10Hz-32Khz
- -3dB: 7Hz-60Khz
The Nano 50/50 SE45 or 2A3 %78 Nickel sowter transformers .
Now %78 Nickel cores, double stacked with High End Silicon Steel .
We have upgraded our output transformers to %78 Nickel Cores custom made for us by SOWTER TRANSFORMERS from the UK .
This amplifier will except 45 or 2A3 tubes , only the hum pot's need to be adjusted on the top of the chassis .
Now Finnish Koskisen Birch plywood chassis .
Neotech Copper and Silver Foil wiring .
This Amplifier is a stunner when it comes to clarity and correct timbre of musical reproduction .
The quality of tonal accuracy produced by this product is stunning , you will want to listen to your favorite artist for hours ,its as if they are in the room !
Jupiter coupling capacitors !! PSC Audio Silver or Copper point to point internal wiring , no mass produced printed circuit boards.
EZ81 rectifier tube choke regulated.
A simple passive Volume control for operation with a CD or DAC input is all that is needed , no active pre amplifier is required .
Standard Frequency Response 10Hz -80 kHz , 9dB headroom.
Distortion @ 1Watt: <0.1% No Feedback
Sensitivity with 12AT7 1.5v 45 tube Input giving a full output of 2.5 WATTS .
Sensitivity with 12AT7 1.3v input 2A3 tube gives 3.5 watts
Noise: < (CCIR) – 90 db.
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
Custom made output transformers by Sowter UK .
Pure Silver wire used in the manufacture of our Perma 50 AG transformers.
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
Perma 50 C cores from the AG 300B with pure silver wire in our 300B Ag .
%78 Nickel 50/50 double stacked with high grade cold rolled silicon steel .
Perma 50 C cores from the AG 300B with pure silver wire in our 300B Ag .
The Famous Kondo Ongaku 211 uses this technology & we don't charge their crazy prices .
Parafeed expalined
NanoAT Parallel – Feed SE45 (50/50) explained - image from Sowter .
It is probably easiest to explain the SE45 / 2a3 (50/50) by extolling the merits of Parallel-Feed (PF) amplifiers compared to traditional Direct feed single output transformer amplifiers. To understand Direct Feed (DF).Direct Feed is when the DC current that biases the output tube runs through the output transformer. When the designer of the output transformer designs a DF output ( all Japanese SE AMPs ) this DC current is a close to saturating the transformer with DC and the AC has to ride over the top of this trying not to distort and remain at full bandwidth ,making the design complex, especially for Single-Ended designs.
Inductance for a Single Ended Amplifier is important especially for stability and bandwidth . Foer a good response the design of DF transformers must make acceptable inductance in the output transformer to load the the output tube. This makes the design complex because the amount of inductance required is a squared property of the amount of DC current, meaning that the transformer for a power of transformer and one that has twice as much power could be 4 times larger. This inductance also works against the designer for top end performance. The more inductance the more capacitance which kills the top end. The designer must make choices as to which variables they choose to get the best sound possible. What Parallel-Feed does is seperate the output transformer up into it's basic pieces. The choke can be designed separately from the output transformer, with much larger inductance , Coupling the two via a the PF Capacitor. The designer can now make each piece individually and optimise each part. The benefits from the PF design are more power and lower noise as well as better frequency response. The drawbacks are more parts, higher expense. and that coupling capacitor which must be of very good quality and optimised for bandwidth , ie a balance must be achieved which we have done well .
WE also use Silver Foil and Oil coupling Capacitors with this design to achieve 10Hz - 80kHz bandwidth .
