Tube buffer

NickC · 8th May 2002, 06:29 PM

Hoping for some light on this question. Would a tube buffer help to add some warmth to a SS poweramp ( JLH 10w). I am currently using a M7 tube pre-amp. Also can it be use for a cd player (marantz cd63) ?. Basically i wanted to start out on tubes, i found that the buffer was easy to start with. I hoping you could help me out.

dice45 · 8th May 2002, 07:38 PM

Nick,

no, i don't think a tube buffer has the sonic footprint typical for tubes. You won't get more warmth out of it.

And no, a tube buffer is not an easy start.
A proper working tube buffer/cathode follwer needs some constant current device as load, else it sounds like junk.
Even then the CF load should be 5-10 times the followers output resistance and as real/resistive as possible.

There is a thread "12AX7 as cathode follower" or the like. Please read it, answers a lot of your questions. And seach for "cathode follower", "tube buffer".

jam · 8th May 2002, 07:53 PM

Your problem might be the cd player. The JLH is fairly warm sounding as solid state goes.

Jam

NickC · 9th May 2002, 11:20 AM

Actually i have read all the post. Dice45 you recommended that to design the buffer with 250v biased at 10.5ma using a ccs. I have design the circuit and hope that you could comment on the circuit i will put up. I will be using it between my cd player

8th May 2002, 06:29 PM	#1
NickC diyAudio Member Join Date: Dec 2001 Location: Earth	Tube buffer Hoping for some light on this question. Would a tube buffer help to add some warmth to a SS poweramp ( JLH 10w). I am currently using a M7 tube pre-amp. Also can it be use for a cd player (marantz cd63) ?. Basically i wanted to start out on tubes, i found that the buffer was easy to start with. I hoping you could help me out.

8th May 2002, 07:38 PM	#2
dice45 diyAudio Member Join Date: Jan 2002 Location: Munich, Bavaria	Nick, no, i don't think a tube buffer has the sonic footprint typical for tubes. You won't get more warmth out of it. And no, a tube buffer is not an easy start. A proper working tube buffer/cathode follwer needs some constant current device as load, else it sounds like junk. Even then the CF load should be 5-10 times the followers output resistance and as real/resistive as possible. There is a thread "12AX7 as cathode follower" or the like. Please read it, answers a lot of your questions. And seach for "cathode follower", "tube buffer". __________________ Greets, Bernhard

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8th May 2002, 07:53 PM	#3
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Your problem might be the cd player. The JLH is fairly warm sounding as solid state goes. Jam