I use a 76 directcoupled 6be8 CF. The 76 sounds marvelous when
feeding another driving tube. It sounded even better without the CF
by a tad, but lower freq's really rolled off when driving cables to
the amp (100k input resistor). Maybe the CCS loading will help in
this regard. Let me know if it does, as the 76 is a really
nice-sounding tube.

Bob Hedberg

"V-Twin" wrote:

Hi all!
I'm playng around with the project of my phono preamp.
After many schematics, now i'm thinking about a EC8010 -- RIAA network --
RCA 76, both tubes CCS loaded.
Maybe this isn't a good design, but i'm a rookie in this field, so be
patient...
At the operating point the plate current for the EC8010 is 25 mA and 4mA for
the 76, both are about at 120V on plate.
Therefore the EC8010 drives more power than the 76. I wonder if this makes
sense. Maybe i'm wrong, but it seems to me that usually every stage drives a
following more powerful stage. It has to be so, or there is no relation
between the power dissipated in a stage vs. the power dissipated in the
following stage?
I' didn't found much information about this.


Bob H.

Just grab that plate in one hand, the chassis in the other,
and FEEL the power of tube audio!!!
(not literally, of course, just kidding. DON'T DO THAT!)