On 6/05/2019 11:37 pm, Howard Stone wrote:
This may be of interest
https://www.pinkfishmedia.net/forum/...heater.227491/
(Still not heard it yet -- the latest info is slightly worrying in fact, I got an email saying:
"There is a slight hum from the transformers which is pretty quiet most of the time but at peak TV time last night with some DC on the mains it did hum quite badly so you may want to use it with a DC blocker. To be clear, this is from the amp chassis itself and mechanical hum from the transformers and not hum through the speakers. It is silent from the speakers in background noise." )
**Pretty normal with many toroidal transformers. They can become noisy
when subjected to excessive DC on the mains supply. It is location
dependent. You may not have a problem in your location. As suggested, a
DC blocker is a simple, inexpensive possible solution.
A few comments on the repair:
* Your tech appears to have done an excellent and thoroughly
professional job.
* See if you can arrange to have the fan suck air UP, rather than
blowing it down. Those idiots at Krell made a huge mistake with early
KSA50 amps, by forcing air down, rather than up. (Hot air rises, after
all). This insanity was rectified in later variants.
--
Trevor Wilson
www.rageaudio.com.au
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