9 x Talent Studio Helios Sowter transformers; 1 boxed + 8 unmounted. Split sales at €150/piece OK

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Ordered from Helios 1976, for solving grounding/hum issues with the Talent Studio console in Oslo, known for seminal ECM recordings in the 70´s and 80´s.
Some transformers were attached to the console frame or to the patch bay, others utilized for balancing/isolation elsewhere in the studio.
I bought these 450 grams(!) trannies from the former chief tech at Talent.
Identical to the Sowters found in the Capital Radio London Helios console.
Sowter labels/numbers are not legible or missing in the Capital Radio pictures.
The stickers are altogether long gone from the Talent Studio transformers.

Probably 4231 in both consoles, as used on the Helios RE24 4-band EQ outputs.
Identical color code, yet some variations in the 3-fold electrostatic shield wires. Sowter made several custom, yet similar hi-gain output transformers for Helios in the 70s; "We made a number of such transformers for low loss and high level capability, including the 4231";
  • General purpose transformers, designed for line level outputs.
  • Part nickel core, most iron and/or steel.
  • 1:1, designed for bridging/isolation in a 600/600 Ohms environment.
  • Fully usable for other source/load impedance specifications as well.
  • Primary and secondary DC resistance: 17 Ohms and 18 Ohms.  
  • Frequency response: +/-0.5dB 20Hz-20kHz. 
  • Max level: +19dBu @ 20 Hz!
Far exceeding analog recording studios´ conservative level norms in the 70´s.
Still coping with today´s ultra-hot mastering levels, though all the desireable non-linear transformer "side effects" emerge gradually long before 0dBfs digital zero. Build/sound quality and specs are on par with the +€300 Marinair output transformers used in the same vintage Neve & Cadac recording consoles.

XLR input and output screens (pins #1) may link via the electrostatic shields.
For unbalanced sources simply connect pins 1 & 3 on the XLR input plug.

In total 9 Helios/Talent Sowters are available, split sales at €130 per piece is OK;
- Unconnected units and box ship instantly; all cleaned, tested & working.
- 2RU panel (as in last picture) with 4 or 8 units; max. 2 weeks lead time.
Panels and box with optional ground lift switches preceding XLR outputs.
Please inquire shipping costs for any "odd-lot" quantities.





This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.

Product Specs

Condition:
Excellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.learn more
Brand Helios
Model Helios/Sowter 1 pound open-frame line output/isolation transformers
Finish Natural
Categories Recording, Utility
Year 1975
Made In United Kingdom

Accepted Payment Methods

  • Paypal

Shipping Policy

Ships from Oslo, Norway to:

United States
$73.48
Norway
$20.67
Europe (Non-EU)
$52.81
European Union
$52.81
Everywhere Else
$52.81

I will ship with tracking to the listed regions. To negotiate shipping rates to other locations, please send me a message.

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Return Window

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.

Anders' Gear Garage

Oslo, Norway
Joined: Jan 2017