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N.B. I do NOT get a commission on any transformers sold by Sowter for my designs.
I also use the S&B TX-102 stepped attenuator transformer for the Zeus Pre-Amp. I do not have the volume or payment facility to handle these items and you should buy these direct from S&B or their local agents.
Note: At time of writing the schematic for the TX-102 shown on the S&B TX-102 webpage is for their Mk II design, whereas the current part is a Mk III which features 2dB steps descending from the 0dB position, not 3dB as shown. I.e. Attenuation is: 0 db, 2 db, 4 db, 6 db, 8 db, 10 db ... N.B. I do NOT get a commission on any transformers sold by S&B for my designs.
Copyright Notice.Please note that Sowter are the only authorised manufacture to make the multi-filar transformers to my designs for commercial sale and copyright of these designs remains mine. You may commission some person or business to make transformers for you for your personal use as per my standard terms. Please ensure that they know that the design is a one off and not to be used as a standard stock item without my express permission. Please however let me know so that I can keep track of who makes what and where they are and can then provide links on this website so others may benefit as I appreciate that shipping large lumps of steel around the globe is expensive (and not environmentally friendly).
These are designed to provide the "perfect" switching of audio signals with the minimal possible effect on the signal. No switching (as well as no capacitors) in the audio path is the preferred method but pragmatically this is not usually possible or convenient and some form of volume control will almost always be required. My attenuator and source selection switches use individual reed elements which are actuated by a small permanent magnet on a rotating arm. No electrical field (i.e. a coil) is used so there is no magnetic flux coupling between signal path and the coil which happens in a conventional reed relay. Each switch unit is hand built by myself from the best quality commercial components and materials. The mechanical parts of the switch are in the main made from aluminium, and for production will be black anodized. Each wafer is premium grade double sided FR4 with plated through holes. If you really want to throw lots of money in my direction I will make you a custom version with ceramic wafers and pure silver metalwork. You should expect to add at a absolute minimum an extra zero to the prices indicated below and probably double the amount as well. The silver will be assayed and hallmarked, you get a unique product of real value, and we get the deposit for a mortgage on a small cottage with a garden, roses and cats. N.B. property described is our aspiration, but we reserve the right to change the dwelling and other specifications due to circumstance, availability and other "factors of life".
Notes:
The information contained here is given in good faith but I cannot take any personal liability for the building or use of any of the items described. Prices are indicative and subject to change without notice. Please email for a confirmed price, delivery expectation and shipping costs. |
All recommended Zeus transformers are now available to order online from Sowter.
All design and other information, drawings and images on this website
are
Copyright © 1992-2010
Susan Parker MIET (unless otherwise credited).
These designs and other information may be used to construct systems specifically for personal NON commercial use only.
N.B. Personal liability disclaimer applies - see T&C.