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Old 3rd September 2009, 07:19 PM   #11
Arick is offline Arick  Canada
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Hi everyone, I finally got the info through a friend, thank you to all for the help
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Old 4th September 2009, 12:37 PM   #12
AndrewT is offline AndrewT  Scotland
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Hi,
if the KSA150 is a two channel ClassA amplifier, then Rocket has seriously underestimated the transformer VA rating required to power the output stages.

3.25A per supply lead for a two channel amplifier requires a continuous DC current of 6.5Adc from the PSU.
The minimum AC rating of the transformer must be at least double this i.e. Irms >=13Aac.
However, this will run the transformer at maximum temperature and will reduce it's life/reliability considerably. The exception here is if the transformer is designed for low regulation rather than to maximum temperature. I think Krell specified some/all of their transformers for low regulation, making temperature much less of an issue.

I would recommend doubling this again for continuous duty i.e. 26Aac for a two channel ClassA amplifier biased to 3.25Adc/channel. This will be BIG, HEAVY and EXPENSIVE.

Let's hope the KSA150 is a ClassAB amplifier.
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Last edited by AndrewT; 4th September 2009 at 12:40 PM.
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