Match priorities to schematic & toobs

rick57 · 19th May 2006, 10:42 AM

A talented & kindly friend

has offered to ease some of my sonic torment (aka diy torpor

), and design and build a preamp (for compensation of cause).

Initial thoughts are where conflict emerges, priority is given to/ not given to:

Lack of harshness 95%

Detail 80%

Transient response 90%

Warmth 60%
845 like meaty richness 75%

Extension 50%

You might say (without triggering other debates) the smoothness & detail of ribbons, with the dynamics of horns

And design ideas:

(Because it will be driving horns and no gain is needed) 0 or 1 gain stage. 0?
Phono stage will be Hageman off-board
Lower mu tubes
Lower current Tubes
Maybe PX25/ 801/ 10/112A/ RE134/ 6072?
Or class A?

fcuk modernity, maybe built into say an old bakelite mantle radio case

Existing contenders are:
Audio Note M7
SY Heretical
a Rankin preamp?
Rozenblit’s Grounded grid

Which of the above, or something else, should best achieve the above priorities?

Thanks kindly

rick57 · 19th May 2006, 04:37 PM

One opinion was that the Audio Note M7 is good for detail and transient response.

Agree or disagree?

kevinkr · 19th May 2006, 04:50 PM

If you have enough of a budget for a transformer coupled dht pre I happily

recommend my 26 based, transformer coupled line stage, it has all of the attributes you describe. (Well in my mind anyway

)

Adaptable to the 01/201 as well, and undoubtedly other similar low voltage, low mu dht's.

The link to the PFO article featuring it is on my site.

rick57 · 19th May 2006, 04:59 PM

> a transformer coupled dht pre I happily recommend my 26 based

What is it's gain?

Cheers

jeff mai · 20th May 2006, 12:33 AM

Quote:

Originally posted by rick57
> a transformer coupled dht pre I happily recommend my 26 based

What is it's gain?

The gain figure is published in the PFO article.

rick57 · 20th May 2006, 03:08 AM

Kevin

Just visited your site for the first time lots of good info, and very well written – excellent!

kevinkr · 20th May 2006, 05:58 PM

Thanks, much appreciated!

More coming soon...

ErikdeBest · 20th May 2006, 08:58 PM

Hi Rick57

I can recommend Frank's preamp: A 12BH7A WCF with gain slightly less than 1. I build it (including the regulated power supply) and the system (i won't say the preamp) sounded much better than with just a passive stepped attenuator. You can find a lenghty thread searchinf for 12BH7A.

Erik

Zen Mod · 20th May 2006, 10:00 PM

12B4 preamp or WOT (DHT or not

)

SY · 20th May 2006, 10:31 PM

The Heretical will not give you the sound you're looking for. There, that shortens the list nicely!

19th May 2006, 10:42 AM	#1
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Match priorities to schematic & toobs A talented & kindly friend has offered to ease some of my sonic torment (aka diy torpor ), and design and build a preamp (for compensation of cause). Initial thoughts are where conflict emerges, priority is given to/ not given to: Lack of harshness 95% Detail 80% Transient response 90% Warmth 60% 845 like meaty richness 75% Extension 50% You might say (without triggering other debates) the smoothness & detail of ribbons, with the dynamics of horns And design ideas: (Because it will be driving horns and no gain is needed) 0 or 1 gain stage. 0? Phono stage will be Hageman off-board Lower mu tubes Lower current Tubes Maybe PX25/ 801/ 10/112A/ RE134/ 6072? Or class A? fcuk modernity, maybe built into say an old bakelite mantle radio case Existing contenders are: Audio Note M7 SY Heretical a Rankin preamp? Rozenblit’s Grounded grid Which of the above, or something else, should best achieve the above priorities? Thanks kindly

19th May 2006, 04:37 PM	#2
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Audio Note M7 One opinion was that the Audio Note M7 is good for detail and transient response. Agree or disagree?

19th May 2006, 04:50 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	If you have enough of a budget for a transformer coupled dht pre I happily recommend my 26 based, transformer coupled line stage, it has all of the attributes you describe. (Well in my mind anyway ) Adaptable to the 01/201 as well, and undoubtedly other similar low voltage, low mu dht's. The link to the PFO article featuring it is on my site. __________________ www.kta-hifi.net

19th May 2006, 04:59 PM	#4
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	gain? > a transformer coupled dht pre I happily recommend my 26 based What is it's gain? Cheers

20th May 2006, 05:58 PM	#7
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Thanks, much appreciated! More coming soon... __________________ www.kta-hifi.net

20th May 2006, 03:08 AM	#6
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Kevin Just visited your site for the first time lots of good info, and very well written – excellent!

20th May 2006, 08:58 PM	#8
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	Hi Rick57 I can recommend Frank's preamp: A 12BH7A WCF with gain slightly less than 1. I build it (including the regulated power supply) and the system (i won't say the preamp) sounded much better than with just a passive stepped attenuator. You can find a lenghty thread searchinf for 12BH7A. Erik

20th May 2006, 10:00 PM	#9
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	12B4 preamp or WOT (DHT or not ) __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

20th May 2006, 10:31 PM	#10
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	The Heretical will not give you the sound you're looking for. There, that shortens the list nicely! __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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