Amplifiers Technical Performance & Design Philosophy

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Teramoto Nanocrystalline Finement Output Transformers

300B  24W(40Hz )Freq. Response  8~80kHz( DC  60mA 3k-8Ω -3dB , 2.5W )


2A3/6A3 /PX25  10W (50Hz)Freq. Response 14Hz - 60KHz (3.5K - 8 ohm, 1W, -3dB)



Amorphous Double C core Output & Permalloy Output Transformers

Standard Amorphous

20hz -60Khz   - 2dB 

Extended Frequency Amorphous Option extra $400

20Hz - 80 Khz  - 2dB 

>Potted Permalloy 6Hz - 65kHz @-3dB  measured in circuit

Extended Potted Permalloy Option

4Hz - 70KHz @-3dB measured in circuit

Power Supply Transformers 240v 50Hz or 120v 50/60Hz

All Power supplies are made with custom wound EU Toroidal Transformers with extra shielding for low residual eddy currents .

The 6A3 is a dual mono power rail with Tent Labs 10H Choke 

The 300B / PX25 Tent Labs Choke 10H 

All Capacitors Low ESR 

Ripple >  -90dBv or about 0.0031%

 Input impedance: 100 kohm
Input voltage: 240V  50/60hz

120V available by request)
Power Transformer 150VA /6A3 -250mA /300B/PX25
Size: 300B/6A3  400 x 300  18kg

PX25 300x 200  16kg

300B/2A3/6A3/PX25 - Heaters Powered by Rod Coleman Constant Current Source DC for perfect performance ,no audable hum 


 

Input Sensitivity ,Distortion & S/N

6A3 Input sensitivity: 1.5Vrms  S/N Ratio: 80dB THD >1% -3W/1kHz

300B  Input sensitivity: 1.8Vrms  S/N Ratio 80dB THD >2.8% – 8W/1KHz

PX25 Input Sensitivity 2Vrms S/N Ratio 80dB THD >3% - 6W/1KHz

Design Philosophy

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30 years of professional broadcasting helps shape our designs. We do not use Z11 Steel in our output transfomers, as we have chosen superior performing metals.

                                Single Ended 6A3/300B 


Our head designer has worked in the Professional Broadcasting Field for over 30 years .

The shortest simplest signal path is paramount to excellent audio reproduction 

We only use two tubes !


One input and one output .

Direct Coupling is used with the 6A3 and Nickel Skirted  Plate and Grid Chokes feeding a Teflon Capacitor with the 300B.


The GZ32 Rectifier used in the 2A3/ 6A3 & GZ34 with the 300B both have a slow start up to protect valuable tube Cathodes and low voltage drop producing excellent results.


All film Capacitors in the power supply for speed and dynamics.


Top quality components , including Dale WW, TKD and Caddock thick film resistors.


The integrated models use TKD Etched Volume Controls.


Neotech Bare OCC wire with specially treated coating and Silk Tube Dielectric for signal wire.


Neotech Solid Silver Hook Up Wire and Binding Posts area a feature of the 300B that uses the Electra Print PSS- Silver Secondaries Output Transformer.


Single Ended PX 25


This is a new concept for Nano-AT , the driver stage is a ECC88/6922 dual triode , with a  Teflon Capacitors on the first stage and DC Coupled the second stage direct to the PX25.


Both 1/2s of the ECC88 have Constant Current Source power driven to the plates , exhibiting very stable and clean DC, enabling exceptionally low noise and distortion keeping the Teflon Capacitor constantly charged for excellent bass, dynamics with a natural purity to the sound.


A GZ34 Rectifier with  low voltage drop , all Film Power Supply Capacitors, for very smooth running with very low impedance for excellent bass response, fast transients ,great midrange and crystal clear high frequencies.


The wide bandwidth balanced input transformer allows the use of fully balanced XLR inputs or switchable to RCA input.


CMC Speaker and RCA Input Connector's with Gold Plated XLR for Balanced and switchable inputs.


A profesional monitor grade Amplifier 



Transformer Performance 

Electra Print M19 EI  Copper or PSSS Silver Secondary 

15Hz -28KHz -1dB 

The Standard Amorphous Double C core is 

20hz -60KHz  - 2dB

Special order 20hz-80KHz - 2dB 

Teramoto Nanocrystalline Finement 

Standard Model 6A3 Amplifier 

14Hz - 60KHz (3.5K - 8 ohm, 1W, -3dB)

Potted Permalloy

20W SE OPT Permalloy

* 6Hz - 65kHz @-3dB  measured in circuit    

Musicality 


M19 Core Electra-Print 


http://www.meta-gizmo.org/tri/vtv-se.html


Electra Print M19 Copper is a great performer, we have measured  frequency response flat from 20Hz to 28 KHz -1dB with excellent bass, warm and full midrange and very clean high end extension well beyond the human hearing range.

The PSSS Silver Secondary Electra Print is the ultimate in low distortion and clarity a real Audiophile Product.

These Transformers have been in production for over 30 years and brands like Eddy Current ( Moth Audio)  DeHavilland,Wellborne Labs, Cyrus Brennan, Modwright and many others have used them to great success.



Our  Amorphous Range of Single Ended Amplifiers exhibit great clarity and  speed , an expansive soundstage ,excellent  dynamics and very wide frequency reproduction .

PRAT  pace rhythm & timing abound ,musical reproduction is very natural  with correct timbre of the original recording faithfully reproduced .

Micro  Detail and Dynamics the real strength of a correctly designed single  ended amplifier are present as if you were there , whether in a studio  or live .


Teramoto Finement Nanocrystalline are the most detailed and analytical transformers I have ever heard.

Made for the Audiophile who wants to hear deep into the original mix 


Nanocrystalline metals can be produced by rapid solidification from the liquid using a process such as melt spinning. This often produces an amorphous metal, which can be transformed into an nanocrystalline metal by annealing above the crystallization temperature.  Wiki  







electra-print Ei core Copper or PsSS silver secondary

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Electra-Print EI Core Output Transformers are Legendary, USA made that have been around for decades and very large for their given output.

All Jack Elliano's Transformers are guaranteed for 25 Hz - 20KHz minimum but in testing we have measured 15Hz -28KHz -1dB almost ruler flat.

Bass extension is extraordinary ,midrange with the EI cores is full and rich and real strength of this type of core, while C cores are a little leaner.

High Frequencies are very revealing and super low in distortion with an excellent square wave measurement with no HF ringing. 

M19 with very high permeability is able to sustain DC  flux saturation better than other metals allowing for deep extended bass and  an ease of musical reproduction across all frequencies, free from stress and early roll of in the bass register when heavy demanding musical notes are in the mix.

PSSS, partail silver secondary

https://www.electra-print.com/psss.php

Silver wire audio transformers have been known to make an improvement in audio reproduction for decades. Silver has a higher sensitivity to flux change (200%)  anabling it to reproduce lower level  information produced by the output stage including harmonics produced  by  musical instruments. ElectraPrint Audio has a new line of  transformers using Partial Silver Stranded Secondary (PSSS).

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Potted Permalloy 80% Nickel Cores special order only as they are custom wound upon request

Excellent Frequency Extention


35W 300B Special Edition Permalloy

* 4Hz - 70KHz @-3dB measured in circuit


20W SE OPT Permalloy

* 6Hz - 65kHz @-3dB  measured in circuit 

Hammertone or Saturn Black Finish

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hitachi metals Amorphous interstage transformers for 300B

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Double Coil Wideband Interstage Transformers

Custom Made Interstage Transformers Option for 300B Amplifiers.

These are excellent performing devices for coupling the E280F to the grid of the 300B output tube.


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Special build option on request