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Old 20th Dec 2017, 2:25 pm   #2
wd40addict's Avatar
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 683
Default Re: In praise of the Ultra FM950

I have one of these. Initially I changed just the larger Hunts caps and it worked fine for about 3 years. Slowly performance dropped off and was restored by changing the final small value ~1n Hunts caps. It just goes to show that Hunts caps can deteriorate in front of your eyes!

Interestingly the grid capacitor on the output valve is a disc ceramic, suggesting that even back in the day Ultra knew Hunts paper type were inclined to be leaky.
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