Re: Where can I by Tango transformers?


Benny Højvælde wrote:
Hello

I want to build a SE amplifier based on SV572-3 tubes.

I found a schematic on a japanese homepage, where there was used Tango OPT.

Now I ask " Where can I buy Tango transformers i Europe?"

Regards

Benny

Tango is out of business. SV572-xx are out of production.

If you have can find a stock of SV572-xx, you may substitute some very
attractive transformers for the Tangos, depending on the amplifier
design.

For low-voltage medium-current design of SV572-xx, try Lundahl cut
C-Core output transformers, which would be pretty close to the Tangos
often used in these Japanese designs like those by or Riochi Sekeido
(check spelling).

For higher-voltage full-current design of SV572-xx, try the power and
output transformers Menno van der Veen designed for my T199
Millennium's End amplifier, which are made and catalogued by Amplimo in
the Netherlands and Plitron in Canada.

Below I give some details of the T199 Millennium's End transformers.
The amps are a lot further along than when I wrote these notes seven or
eight years ago, but I shan't be updating the notes as I decided not to
publish kilovolt designs; 300B amps are dangerous enough!

Good luck with your amp, Benny.

Andre Jute
Visit Jute on Amps at http://members.lycos.co.uk/fiultra/
"wonderfully well written and reasoned information
for the tube audio constructor"
John Broskie TubeCAD & GlassWare
"an unbelievably comprehensive web site
containing vital gems of wisdom"
Stuart Perry Hi-Fi News & Record Review

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Some notes from 1998 on the circuit and transformers of the
Type 199 Millennium's End SE Amplifier
Svetlana SV572-xx
"Universal" Amplifier
I am working on a hi-po (70W) SE amp to drive panels for headbangers,
based on Svetlana's exceptionally fine SV572-xx tubes; by just
swapping tubes, lower powered versions (25-60W) will also drive panels
and anything else for lovers of chamber music and voices. The SV572-3
is great on voices, the -10 on chamber music and symphonies, and the
-30 offers brute power. The sound of the -3 and the -10 falls somewhere
between 211 and 845, a mix of precision and warmth.

Here are brief details of the output and power transformers which have
already arrived:

Wide Bandwidth Low Loss Toroidal Single Ended Output Transformer
Type No VDV-JUTE-HQ5090 (Amplimo)
Designed by Menno van der Veen, ir. Buro Vanderveen

Pri Z 5.014Kohm
Secondaries 2, 4, 8 ohm (winding ratios 50.069, 35.415, 25. 034)
Nominal power 90W (at half saturation current, 190mA)
Saturation current 379mA
Primary Inductance 31.8H
Full power bandwidth starting at 28Hz -1dB
Frequency range 16 Hz--23kHz (-1dB)
HF extension 44kHz (-3dB)
Insertion loss 0.152--0.225dB depending on secondary connection
Primary leakage inductance 28mH
Effective primary capacitance 0.44nF
*Size approx 7in diameter by 4in high
*Weight approx 9kg or say 20lbs
Connections by insulated flying solid core extensions of windings (no
solder joints) with tinned ends
Packaged in heavy gauge drawn ali case, matte black finish

*These items are not off the preliminary spec ***, which is out of
the designer's lab rather than from the manufacturer, but my own
measurements.

SV572 reach max dissipation of 125W, with 210mA and 1000V as the other
maximum parameters. I want to get max A1 power when using the SV572-3
and SV572-10 before they go into A2, which requires high voltages. The
primaries of the outputs are specced to be used at least up to a 1000V.

The key application is PSE Svetlana SV572-30, (Rp for a parallel pair
2.3Kohm) at around 100mA per anode but the transformer also works with
single tubes of the SV572 family. Various pri Z are achieved by
switching the secondary connections to reflect different impedances on
the primaries. (I also intend one day building a 212-E SE amp on this
tranny.)

A power supply is required with individual windings for power, driver
and input tubes, and more windings for multiple individual fixed bias
supplies to these tubes (we want deep bass!), plus of course filament
windings. It should offer maximum flexibility so as to be useful for
other projects as well (like the 212-E above), and it should be plenty
beefy because a hefty SE amp like the Millennium's End will just
naturally end up driving current-hungry panels. So naturally I went to
Menno for the power supply as well:

Multi-Purpose Mains Power TransformerTransformer
Type No 6632-X0-00 (Plitron)
Designed by Menno van der Veen, ir. Buro Vanderveen

Primary (international use) 2 x 120 V
RF Shield Yes
Low Noise NC-15 Design Yes
Cased in heavy gauge drawn ali case, matte black finish, foam base,
neoprene mounting ring, single bolt fixing
Connections by insulated colour coded flying leads
Size approx 7.5in diameter by 5in high
Weight approx 12kg

Sec.1 after rectifying
1050 V / 0 mA
1000 V / 200 mA
950 V / 400 mA
800 V tap Yes
Centre tap No

Sec.2 after rectifying
520 V / 0 mA
480 V / 150 mA
Centre tap No

Sec.3 after rectifying
0/70/140/275 V at 0 mA
0/65/130/250 V at 150 mA

Sec.4 Filament, after rectifying
7.0 V / 0 A
6.3 V / 4 A
Centre tap Yes

Sec.5
as Sec.4

Sec.6 Filament, drivers + rectifier
7.0 V / 0 A
6.3 V / 4A
Centre tap No

My prototypes were designed by Menno van der Veen with the output
transformer prototypes wound by Amplimo and the mains transformer
prototypes wound by Plitron, both of whom manufacture Menno's famous
mainstream designs. [The custom power and output transformers for my
Millennium's End have since been productionized and catalogued.]

Svetlana SV572-xx are available at all the usual outlets; in the UK
Billington stocks them [true in 1998; in 2006 you should ask first!].
Those who want to try SV572 and already have a 300B amp should buy a
pair of SV572-3 or -10; the low B+ of the 300B may not be ideal but
with a minimum of work you can get an idea of the SV572's clarity and
appeal. 6.3V 4A fils. If you have an 845 or 211 amp, you're flying and
can get an even more realistic idea without too much soldering.

Copyright © 1998 Andre Jute

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