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Old 11th February 2010, 06:24 PM   #1
markusA is offline markusA  Sweden
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Default What tubes for a tube amp?

I'm sure there are threads out there discussing this but I wouldn't know what to search for?

If I wanted to build a tube amp without output transformer, what tubes would be a good choice?
Lets aim for 20w or something along those lines?

I like the thought of a single ended amp so I guess that would be on my wishlist as well. But I don't know enough about designing amplifiers to really kno what I'm talking about.

I just want a place to start my reading.
So, a recomendation on suitable tubes and perhaps a topology. That'll keep me busy for a while.
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Old 11th February 2010, 06:41 PM   #2
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Originally Posted by markusG View Post
If I wanted to build a tube amp without output transformer, what tubes would be a good choice?
Lets aim for 20w or something along those lines?
Twenty watt OTL? Why set your goals so low?

Transcendent Sound Introduces THE BEAST OTL AMPLIFIER
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Old 11th February 2010, 06:45 PM   #3
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I just want a place to start my reading.
So, a recomendation on suitable tubes and perhaps a topology. That'll keep me busy for a while.
Suggest getting Morgan Jones' book on tube/valve amplifiers. It has become the modern design bible.
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Old 11th February 2010, 07:26 PM   #4
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Suggest getting Morgan Jones' book on tube/valve amplifiers. It has become the modern design bible.
That's pretty funny! The OTL section in MJ's book is about 2/3 of a page!
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Old 11th February 2010, 07:28 PM   #5
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The OTL section in MJ's book is about 2/3 of a page!
And why is that, exactly?
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Old 11th February 2010, 07:56 PM   #6
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And why is that, exactly?
I'm not sure if that's sarcasm or not, but basically from what I remember of reading it MJ is no fan of OTL's and also does not claim to be an expert in their design.
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Old 11th February 2010, 07:57 PM   #7
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Originally Posted by markusG View Post
I'm sure there are threads out there discussing this but I wouldn't know what to search for?

If I wanted to build a tube amp without output transformer, what tubes would be a good choice?
Lets aim for 20w or something along those lines?
tubes able to deliver a LOT of current, preferably at relatively low operating voltage. Big horizontal sweep tubes come to mind...
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Old 11th February 2010, 08:08 PM   #8
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Ok, at least now I know it's called OTL.
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Old 11th February 2010, 09:14 PM   #9
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Buy a kit from Tubelab (George). He posts here pretty often and even has his own forum.

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Old 11th February 2010, 10:32 PM   #10
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I'm not sure if that's sarcasm or not...
Sorry, none intended. I see very little conversation about OTL. Always assumed there must be something inherently difficult/expensive/evil about it.
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