Isolation transformer

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Because of dirty mains power and increased safety considerations, I want to use an isolation transformer on a new guitar amp I am building. My power transformer is a 250 VA rating. Should the isolation transformer also be 250VA, or for some reason I'm not aware, it can be less. Thanks to all of you for your generous spirit in sharing info.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.