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Old 19th May 2006, 10:42 AM   #1
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Default 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
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Old 19th May 2006, 04:37 PM   #2
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Default Audio Note M7

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

Agree or disagree?

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Old 19th May 2006, 04:50 PM   #3
kevinkr is offline kevinkr  United States
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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.
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Old 19th May 2006, 04:59 PM   #4
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Default gain?

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

What is it's gain?

Cheers
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Old 20th May 2006, 12:33 AM   #5
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Default Re: gain?

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.
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Old 20th May 2006, 03:08 AM   #6
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Kevin

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

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Old 20th May 2006, 05:58 PM   #7
kevinkr is offline kevinkr  United States
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Thanks, much appreciated! More coming soon...
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Old 20th May 2006, 08:58 PM   #8
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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
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Old 20th May 2006, 10:00 PM   #9
Zen Mod is offline Zen Mod  Serbia
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12B4 preamp or WOT (DHT or not )
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Old 20th May 2006, 10:31 PM   #10
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The Heretical will not give you the sound you're looking for. There, that shortens the list nicely!
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