Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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RE: I'm perplexed as to why one channel of my SET amp has 4.0 mv. of hum and the other has 1.2.....

Posted by drlowmu on July 3, 2012 at 00:44:37:
Are the Finals DHT tubes or indirectly heated.?? Need to know that. Are your filament heated with AC or DC ?
If DHTs on AC : swap tubes between channels and remeasure hum to see how much of that is due to tube differences, which with DHTs can easily account for these measured differences. Report back to us please.
One other thing, a dead quiet DHT amp is also often a dead sounding amp !!
Jeff Medwin