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Old 10th October 2009, 07:56 AM   #31
disco is offline disco  Netherlands
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Originally Posted by ErikdeBest View Post
could not get good results, yet...)
What's the main trouble you're having, lacking bass?
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Old 10th October 2009, 09:00 AM   #32
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Location: Zrich
Hi Jaap

thanks for the link! My transformers are from AE as well (amorphous core, potted...) and they perform well, bass is not lacking with either pentode or triode. So I was happy with the transformers, but the F2 clone brought more details in the music...

But surely I have not given up, and will keep experimenting and switching between both.

my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!
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Old 10th October 2009, 06:26 PM   #33
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Originally Posted by ErikdeBest View Post
Regarding transconductance amplifiers...
Does anyone have a primer on the how's and the why's here? Rp of this tube is 60K, which with a 5K:32 stepdown seems to me to be a Z out of ~400 ohms. So, if one were purposely designing such a thing and not accidentally backing into it, what would one look for in terms of specs? Is just Gm important, or plate dissipation, or rp? Does the stepdown ratio matter?
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