tdogzthmn said:thanks for the response blackplate. I'd rather not mess with the wiring as things sound great already. The next tube on my list is the 5998 which seems to be the best all-rounder. Possibly a 7236 if I find one at a decent price.
Grainger49 said:Shouldn't the 12BH7 be added in the list in the OP? Or is it a drop in replacement? I looked and it is not a drop in replacement for the 12AU7.
ToolGuyFred said:. . . smaller output caps (220uF Black Gates) which seem OK with my old Sennheiser HD580s.
ToolGuyFred said:I had an irritating intermittent hum and low level buzz which sometimes went away when I tapped the chassis plate with a finger. Tapping the chassis plate was clearly audible through the cans so something was obviously very microphonic. Quick visual double check of build and voltages suggested all OK there so time to try different tubes.
Grainger49 said:Since this is your first post I don't know if this is your first kit, so bear with me. I am only trying to help with your problems with the Crack.
ToolGuyFred said:. . . smaller output caps (220uF Black Gates) which seem OK with my old Sennheiser HD580s.
They do sound better after a few hundred hours but they sound good straight away and then get better. They don't like to be powered down for a long time though, so don't bother with them if you leave your gear switched off for weeks at a time (my stuff is used every day).Grainger49 said:I don't have much experience with such high dollar caps. I have used them once but it took weeks for them to break in. I wondered if you had, or are having the same experience?
ToolGuyFred said:I had an irritating intermittent hum and low level buzz which sometimes went away when I tapped the chassis plate with a finger. Tapping the chassis plate was clearly audible through the cans so something was obviously very microphonic. Quick visual double check of build and voltages suggested all OK there so time to try different tubes.
Grainger49 said:This brings to mind an old vaudeville routine, "Doc, it hurts when I do this..." So don't tap the top plate. Microphonics are a tube problem. You don't get the best quality tube with the kits, Doc et al leave that up to us to play with.
The buzz being intermittent would normally point to a bad connection, cold solder joint. Rewet as many solder joints as you can find. If it is in one channel then it is after the power supply. If in both it is most likely in the power supply.
Oops. Should read 22uF. This lightens the bass a bit but the 580s aren't short on bass.ToolGuyFred said:... smaller output caps (220uF Black Gates) ...
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