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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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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.

Erik
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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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