The only info I've ever found on that supply is here:
It's on page 5 or 6...
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I used to use one back in the mid to late 90s. ? Helper was founded by Bill Detwiler (I forget his callsign) around 1975 and went out of business around 1999-2000 after he died.
The the remains were acquired by Zetron.? Zetron, in turn, was acquired by JVC / Kenwood but continues as a company.?? At a recent IWCE trade show the people in the Zetron
booth had no idea that they once sold Helper products (I tease them that they should bring back the RF Millivoltmeter).
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Mike WA6ILQ
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