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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Built it using the 6EW7 tube!
And i must say, it sounds so lovely. It sounds amazing. Running it off of rectified mains, with a circuit I found that uses 6EM7 tubes. (those kind have slightly higher gain than mine, but are otherwise the same tube)
I'm very happy with my amplifier, however, I noticed that the overall volume level is unchanged. The bass and sound of the music sounds better though, but the volume sounds no different, maybe a TAD louder.
Should I add a preamp preamp? :P
It's already using the two triodes available in the tube. So if I do make a pre-pre amplifier, it would need to be something relatively simple.
I would just use a transistor one...but I'm afraid of defeating the purpose of even using tubes that way.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Great job!
How is the noise?
As for the preamplifier, it's common to have many stages in tube designs to make up for their lower gain. You only need the extra stages if it's not loud enough.
My guess is that you can get a lot more power out if you double mains and add a preamplifier, but if it satisfies your needs as it is, I don't see why you should change a thing.
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
But remember you only get maximum 2 watts from that lil amp cir u built with those tubes, so it may well be that it doesent have the power to go any louder with your speakers.
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Tube Amplifier
