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Old 28th October 2008, 06:39 AM   #1
athos56 is offline athos56  United States
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Talking Tube Buffer Success!

I finished my Tube Buffer. It was an unqualified success. It is transparent, no psu noise and no coloration of the music, if the music didn't slowly come on as the tube rectifier warmed up I wouldn't have believed it was even there and I accidently wired the inputs to the outputs It is a basic cathode follower with a choke for the cathode resistor. I used ceramic comp resistors, except for one hard to find value in the heater reference. The tubes are Jan 5687's and the rectifier is a 6v4. The PSU is a CLCLCR. I used the cloth covered solid core wire from AES. I also used 2 10k/10k Edcor transformers at the inputs and Angela Copper in oil caps at the output. Worked like a charm, now it is on to my Kt88 Set.
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Old 28th October 2008, 06:46 AM   #2
athos56 is offline athos56  United States
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Default Inside

My 47uf Solen caps in the PSU were too big for the case so I had to stand the bottom off a bit...
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Old 28th October 2008, 07:14 AM   #3
athos56 is offline athos56  United States
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Default Just in case someone cares.

More, and the filter should be a CLCLRC, not a CLCLCR
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Old 28th October 2008, 08:19 PM   #4
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Nice work!

Those Solens are pretty big huh? I just got my hands on a pair of 100uF's for a headphone amp project. HUGE! I'm going to have to mount them top side. Good thing the old Bogen chassis has a cage to keep hands out.
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Old 28th October 2008, 10:01 PM   #5
athos56 is offline athos56  United States
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Default Yes

They are! I was at aloss for a bit. I looked at those 100uf caps for another project... Thanks for the comment!
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Old 29th October 2008, 03:33 AM   #6
athos56 is offline athos56  United States
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Default More

Did some critical listening with my Grado SR-225's to some Radiohead (In Rainbows) With the volume up there is no change in the background noise (as in there is none). Everything sounded great!
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Old 29th October 2008, 08:36 PM   #7
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Default Tube Buffer

Schematic and parts list please
Ed
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Old 29th October 2008, 08:49 PM   #8
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Indeed, schematic please
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Old 29th October 2008, 09:04 PM   #9
athos56 is offline athos56  United States
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Talking Ok Ok!

When I get home I'll draw it up!
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Old 30th October 2008, 01:15 AM   #10
athos56 is offline athos56  United States
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Default Here it is

One Channel
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