TONA T20/40 Moving-Coil Step-Up Transformer SUT
tona 20-40 moving Coil step-up

The TONA T20/40 step-up transformer (SUT) is targeted enthusiasts and intended for moving-coil type cartridges.These traditionally provide a very low signal, and are difficult to amplify without noise.

The transformer is a match for tube amplifiers, as the very high gain at 1:40 can be an advantage at low volume, and can also be used with a (tube) MM RIAA with a good dynamic range at high levels.
At the same time, 1:20 with a more all-round 26dB gain instead of 31dB, is usable for most cartridges with low output.
Tona T 20/40 has two separate inputs with separate windings on the primary side.

tona 20-40 moving Coil step-up

Specifications

• Two inputs 1:20 and 1:40
• Specify balanced (XLR) or ubalanced/balanced (RCA) when ordering
• Including solid mahogany case, that can be placed on the wall
• Laminated soft iron case with 8 to 20 mm overall thickness
• Wideband toroidal nanocrystalline transformers wound inhouse
• Primary resistance 0.1 Ω (1:40)
• Secondary resistance 25 Ω (1:40)
• The transformers are induction matched in stereo pairs before winding
• Low noise and wide frequency spectrum (5Hz-100kHz -3dB at 4Ω/20KΩ).
• Phase linearity 0.9 degree at 20kHz
• Matched in stereo 0.3 dB 20Hz-20kHz
• Litz primary winding
• Connectors : Rhodium plated RCA connectors, gold plated XLR connectors
• Non vibration dampening material floats the transformers
• Stable heavy base accepts all XLR and RCA cables
• Demagnitized before shipping
• CE and ROHS approved
• 2 years warranty
• Hand made in Aarhus, Denmark

tona 20-40 moving Coil step-up

Dimensions 125 x 150 x 46 mm 4.9″ x 5.9″ x 1.8″
Total height: 63 mm 2.48″
Weight: 4.1 Kg 9 lbs

Delivery time 2-3 weeks.
Suggested retail price 3.500 USD / 3.000 EUR
Distribution

tona 20-40 moving Coil step-up

Examples of ratios available with a 47KΩ MM phonostage:
The transformer input impedance Turns Ratio 1: Max possible gain in dB
30 40 31,9
35 37 31,3
40 34 30,7
45 32 30,2
50 31 29,7
60 28 28,9
70 26 28,3
80 24 27,7
90 23 27,2
100 22 28,9
120 20 25,9
140 18 25,3
160 17 24,7
180 16 24,2
200 15 23,7
250 14 22,7
300 13 21,9
325 12 21,6
475 10 20

T20/40 1:40
Frequency 4Ω/20KΩ (-60DBFS +13dBu)
-3dB: 5Hz – 100kHz
Phase deviation 20Khz: 0.9 grader
Channel separation: 120dB
Stereo balance: 0.3dB (20Hz-20kHz)

(click for larger picture)

Tona M5 Moving Coil SUT step-up
THD at 1kHz: 0.022%

Tona MC step-up SUT distortion

 

Tona-T20-40