starange noise when no stops drawn on Wyvern B282

[thomas vitae]

My Church has just bought a second hand Wyvern B282. There is an electronic hissing noise which appears after the organ has been in use for a while. The noise reduces if any stop (including couplers) is drawn or if the volume is turned DOWN. It comes through on the harpsichord and piano settings as well. The noise also comes through from the line output and so must be before the main internal amplifier (the line output is taken before the main amplifier but after the preamplifier). Two organ engineers have investigated this problem and are struggling to diagnose the cause of this. Does anyone have any ideas please?

Moved to the appropriate section of the forum. Andy G - Moderator

[andyg]

Have you contacted Wyvern? https://www.wyvernorgans.co.uk/

The B282 is a nice instrument, I remember reviewing it when it was released. Some years ago now, and old technology, but I've always found the people at Wyvern to be very helpful.

[thomas vitae]

The advice of Wyvern's chief service engineer was sought but he had not come across this problem before. The strange feature seems to be that the problem sound is loudest when no stops are drawn, as is the fact that the noise reduces when the volume is turned down rather than up.