| Re: SE 300B Project, Part 13 - The finished amp [message #31926 is a reply to message #31925] |
Tue, 11 July 2006 11:33   |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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Unfortunately, I don`t have any experience with TVC - please, try it and report how it worked out! 
For the input capacitance of CCS loaded (I assume that you use CCS?!) stage, we must "count" on large "Miller" capacitance. Although EC8010 data said Cag=1,9pF, Morgan Jones measured 4,6pF-4,8pF (!), and if it is actually true, you can expect ~ 300pF on the triode input! If you have "Valve Amplifiers 3" - it`s on the page 560 and around...
For C3g, data said Cag in triode 2,7pF, let`s say 3pF - then we can expect probably ~160pF of input capacitance.
Again, my opinion is to build the 90% of the amp "as is" (PS and output stage, and part of the input stage), then temporarily try EC8010 on its socket and its parts soldered on socket pins. Then try C3g version, with various options (Rk or LED bias, g3 connections...).
Only then you`ll know for sure what works for you.
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| Re: SE 300B Project, Part 13 - The finished amp [message #31930 is a reply to message #31926] |
Fri, 21 July 2006 04:19 |
horny
Messages: 11
Registered: May 2009
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Chancellor |
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hi Damir
I build the amp and tryed the C3g and ec8010 first i must say i build the amp with ux245 as output tube.
I used the C3g driver stage as you post here
and the ec8010 at 150v /20m.
The ec8010 is very good more hights and more bass then the c3g
but the hights are not sparkeling ,not loose. More like an transistor amp.
Very impressive but i think not for a long time.
The c3g has more fluidness (sorry for the strange talk) i try to explane sound thats not easy
the sound is also more clean
and there is a good balance in the whole freq.spectrum So the c3g is staying
i like it !!!
For me this sounds best but i think that others may like the ec8010 more. Then i tried the ec8010 and the c3g with the same operation points
interstage coupled.
I have amorphouse interstage tranny's from Tribute audio
the opt's are also amorpouse one's from the same builder.
The carractre of the tubes is the same now but no there is an naturalnes to the sound its smoother and more relaxed but still dynamic and very very clean.
I like the amp most with the c3g driver interstage coupled
its also a very simple set up.
Robert
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| Re: Wow! :-) [message #31935 is a reply to message #31934] |
Sat, 22 July 2006 04:56 |
horny
Messages: 11
Registered: May 2009
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Chancellor |
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hi Damir
I build the whole set by myself
the speakers are 60cm Oris horns with AER md3 drivers.
The woofers are 15 inch bd15 in a b.r cabinet in front hornloaded with 80 cm Oris horns.
The woofers are active with a plxxo this is a line level filter direct behind the head amp.
So the caractre of the amp is given to the bass unit.
As bass amp i use a diy gainclone with very good power supply big trannie and 14 Black gates in super e cap config.My diy dac is one tda 1543 nonoversampling type.
the turntable is also diy and weigts 38 kg.
(i have a picture if you like)
i do it with a link:
http://forum.audiofreaks.nl/index.php?topic=6571.0
scroll down and you see it
you cant see the motor on the pictures its a separate engine behind the turntable driven with a very thin wire Stepup trannies are from Tribute Audio
and the phono amp is diy.
The passive pre amp are 2 (left and right separate)
autoformers from Tribute Audio.
Cables are all diy. The sound of the speakers can i explane as it are magnifying glasses
the amp that drives them must be very good.
Every thing that is not right is direct audible.
if you feed them crap you get very much shit
If you give them a little hum you get enormouse hum in the room 
It must be under the 1 mv and this is still a little audible.
but with the right aplifier they can sound like heaven
very very detailed with enormouse dynamics and pressure
also with 1,5 watt.
I have also an diy 300b amp
but i like the sound of a 45 more.
But thats just my taste
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| Re: Wow! :-) [message #31936 is a reply to message #31935] |
Sun, 23 July 2006 07:14 |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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Very impressive...serious and quality DIY stuff! Interestingly, you are "blessed" with many HQ transformers winders in Netherlands (Amplimo, AE, Tribute...), specialised shops and large DIY "comunity", so it seems... Did you use "hum pot", or just directly connected Rk//Ck on the minus pole of the filament? I think that even with DC heating, with pot version you can adjust for lower hum...obviously necessary with 110db/W.
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