tube preamp + SS power amp.

yngwie · 26th April 2007, 12:11 PM

?Hey everyone first post.

I just have a quick question about the topic. I've made myself a 12ax7 preamp following hoffmans design, and i plan to make any decent poweramp, mosfet, bjt, gainclone. Ummmm so no clue about tube outputs but i assume the voltage is very high from the 12ax7 ( i'm giveing them 224V B+ is that ok?)
so when it leavs the preamp and hits the poweramp will these voltage cause any upsets on my behalf

alejo · 26th April 2007, 12:58 PM

In this forum all think that no exist any decent SS poweramp.
....
Build one PushPull EL34, 6L6, 5881, EL84 it is decent amp !!!!!!

yngwie · 26th April 2007, 01:21 PM

a yes but i plan to throw in 100 watt power amp. which isn't withing my $$$$ range for all tube.
ANSWER QUESTION >_< lawl!!!
not asking whats best just asking if a tube preamp output is fine with a SS poweramp input

Simpleton · 26th April 2007, 01:46 PM

Yes, it is fine, don't worry (don't forget the coupling cap though)

Wavebourn · 26th April 2007, 04:26 PM

It depends on input impedance of your SS output stage: how high it is, how it depends on a frequency, and how linear, that is also very significant.
I got very-very good results using triode strapped 12L6GC driving 4 transistors.

Wavebourn · 26th April 2007, 04:28 PM

Quote:

Originally posted by alejo
In this forum all think that no exist any decent SS poweramp.
....

Here you go:

yngwie · 26th April 2007, 10:05 PM

cheers all.

gingertube · 26th April 2007, 11:45 PM

I see you are in Melbourne which means that you have one of the best SS Amps anywhere available just down the street.

Have a chat to Hugh Dean.
http://www.aksaonline.com/

I have one of his LIFEFORCE 55 amps and one of his older AKSA 55 Nivarna Plus Amps. I use these as reference amps against which I judge the valve amps I design and build. The LIFEFORCE 55 is stunningly detailed and articulate with effortless presentation across the entire frequency range. The AKSA 55 has a bit of that valve like sound, warm and rich.

I run one of his GK-1 tube buffered preamps all the time, regardless of what power amp I have hooked up on any given day.

Cheers,
Ian

yngwie · 27th April 2007, 01:55 AM

haha my boss ( head of flc microdesign ,coolon) says a well designed MOSFET can do anything a tube can.

Also umm dave ulbrick from ulbrick Sound builds his amps bout 2 k from my house lawl.

26th April 2007, 12:11 PM	#1
yngwie diyAudio Member Join Date: Dec 2006	tube preamp + SS power amp. ?Hey everyone first post. I just have a quick question about the topic. I've made myself a 12ax7 preamp following hoffmans design, and i plan to make any decent poweramp, mosfet, bjt, gainclone. Ummmm so no clue about tube outputs but i assume the voltage is very high from the 12ax7 ( i'm giveing them 224V B+ is that ok?) so when it leavs the preamp and hits the poweramp will these voltage cause any upsets on my behalf

26th April 2007, 01:46 PM	#4
Simpleton diyAudio Member Join Date: Jan 2005 Location: Lisboa	Yes, it is fine, don't worry (don't forget the coupling cap though) __________________ "There's something organic about a happy cloud of electrons" - Neutron Bob

26th April 2007, 04:26 PM	#5
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	It depends on input impedance of your SS output stage: how high it is, how it depends on a frequency, and how linear, that is also very significant. I got very-very good results using triode strapped 12L6GC driving 4 transistors. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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26th April 2007, 12:58 PM	#2
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	In this forum all think that no exist any decent SS poweramp. .... Build one PushPull EL34, 6L6, 5881, EL84 it is decent amp !!!!!!

26th April 2007, 01:21 PM	#3
yngwie diyAudio Member Join Date: Dec 2006	a yes but i plan to throw in 100 watt power amp. which isn't withing my $$$$ range for all tube. ANSWER QUESTION >_< lawl!!! not asking whats best just asking if a tube preamp output is fine with a SS poweramp input

26th April 2007, 10:05 PM	#7
yngwie diyAudio Member Join Date: Dec 2006	cheers all.

26th April 2007, 11:45 PM	#8
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	I see you are in Melbourne which means that you have one of the best SS Amps anywhere available just down the street. Have a chat to Hugh Dean. http://www.aksaonline.com/ I have one of his LIFEFORCE 55 amps and one of his older AKSA 55 Nivarna Plus Amps. I use these as reference amps against which I judge the valve amps I design and build. The LIFEFORCE 55 is stunningly detailed and articulate with effortless presentation across the entire frequency range. The AKSA 55 has a bit of that valve like sound, warm and rich. I run one of his GK-1 tube buffered preamps all the time, regardless of what power amp I have hooked up on any given day. Cheers, Ian

27th April 2007, 01:55 AM	#9
yngwie diyAudio Member Join Date: Dec 2006	haha my boss ( head of flc microdesign ,coolon) says a well designed MOSFET can do anything a tube can. Also umm dave ulbrick from ulbrick Sound builds his amps bout 2 k from my house lawl.

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