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Old 15th September 2012, 07:39 PM   #11
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Hi,

Thanks for the interest. I am already using this configuration for a couple of months, but with Siemens E88CC as a driver and a double matched trio JAN Phillips E88CC for the CF. Sounds really nice!

Here is it again:
Click the image to open in full size.

Regards,
K.

Last edited by BlackBLOOD; 15th September 2012 at 07:41 PM.
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Old 21st October 2012, 04:01 AM   #12
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Colombo egg !
if evry channel get its own driver tube the sound image radically increase
in space and detail ,
the last and definitive measurement i use its by real audiophiles comments.
also 6 triodes for CF ....like V12 F1 engine, perfection c'ant last long,
noise, thd,fragile, for me ,
whay not KT 88 in pseudotriode ?
my last ciuffoli version whit 2X 6S9P (6SL7) and 2X 6P6S (6V6) nos reflector 60'
sound great, but your upgrade by symmetrical HT should be the
NEC PLUS ULTRA, no more electrolytics caps !!!
cheers
claudiomas
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Old 21st October 2012, 09:24 AM   #13
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Thanks for the comment claudiomas!

Main reason for having 6 parallel triodes is to reduce the output impedance:

1 x KT88 = 12 mA/V GM
6 x E88CC = 75 mA/V GM

And the best part about the paralleling is that it is for a Cathode Follower where many of the problems you describe are not present.

I completely agree about your comment on the driver. Two tubes will be better than one for sure. And something that is not on Noval base will be even better! But this is something for the future.

Can you explain more about this NEC PLUS ULTRA? I am always interested in new PSU solutions.
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Old 21st October 2012, 10:29 AM   #14
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Quote:
Originally Posted by BlackBLOOD View Post
Can you explain more about this NEC PLUS ULTRA? I am always interested in new PSU solutions.
(NEC PLUS ULTRA) {LATIN}...Hercule write this after open the sea at Gibraltar, that means:
nothing else after, the ultimate limit, c'ant be better,
PERFECTION.
still we never stop , and i'm sure you can do better whit KT88 ifyou like by grid polarization, even if need MKT output caps.
(i do now nothing about maths...but..)
Warning the heater-Katode voltage ,
for power supply i have a big lot of news 2200uF and 3300uF 200Volts,
so i use bridge rectifier.
cheers
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