Quantity Available
1
Posted
6 days ago
Description
You are bidding on a Woden multi-match modulation transformer, model UM0, serial number 47908. It was designed for valve / tube equipment. It is rated for 10 W audio input, preferably push-pull , thus, to modulate 20 W RF AM.
It is original equipment manufactured by Woden in Bilston, UK. Woden’s design was for very low distortion and high efficiency. I have available a two page document giving all the possible connections and impedances; contact me for the .pdf file. I have not used it; it appears new, apart from a few tiny scuff marks in the paint - see photos.
You can
When I first started getting into Command equipment, I wanted to set up a home radio station, running off the mains. I considered the rated 12 W RF output sufficient to get me started. The Command documentation advised to allow up to 120 A for start-up current. A linear power supply for such current would have been massive. So, I started collecting all the parts required for a home-brew, mains-powered modulator.
When I told a radio amateur friend what I planned, he gave me a much bigger, multi-match modulation transformer, suggesting that I would find 12 W RF somewhat limiting.
So, this Woden multi-match modulation transformer is available.
Packaging
I make no charge for packaging. Your item will be properly wrapped and packed to withstand the usual rigors of postal and courier delivery systems.
Shipping - please read
You may collect the item directly from me. If you prefer it shipped, ask me to quote the shipping charge beause it will depend on where you are and how soon you want it delivered.
It is original equipment manufactured by Woden in Bilston, UK. Woden’s design was for very low distortion and high efficiency. I have available a two page document giving all the possible connections and impedances; contact me for the .pdf file. I have not used it; it appears new, apart from a few tiny scuff marks in the paint - see photos.
You can
- use it for replacement of a failed modulation transformer
- use it as part of your own design of modulator, for instance, for a home-brew Command modulator in place of the MD-7 / ARC-5 or BC-456
- add it to your collection of Woden transformer memorabilia.
When I first started getting into Command equipment, I wanted to set up a home radio station, running off the mains. I considered the rated 12 W RF output sufficient to get me started. The Command documentation advised to allow up to 120 A for start-up current. A linear power supply for such current would have been massive. So, I started collecting all the parts required for a home-brew, mains-powered modulator.
When I told a radio amateur friend what I planned, he gave me a much bigger, multi-match modulation transformer, suggesting that I would find 12 W RF somewhat limiting.
So, this Woden multi-match modulation transformer is available.
Packaging
I make no charge for packaging. Your item will be properly wrapped and packed to withstand the usual rigors of postal and courier delivery systems.
Shipping - please read
You may collect the item directly from me. If you prefer it shipped, ask me to quote the shipping charge beause it will depend on where you are and how soon you want it delivered.
Accessories Included
Shown in pictures
Condition of Item
As New
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