John Curl's Blowtorch preamplifier part II - Page 300

john curl · 20th November 2009, 08:01 PM

Demian, I found a dual 600 ohm Daven. Interested?

brianco · 20th November 2009, 08:37 PM

Quote:

Originally Posted by john curl

Demian, I found a dual 600 ohm Daven. Interested?

A lot of those have a very limited bandwidth! Only a few Db. I have a box of them!!! They were I believe used in radar circuits.

Netlist · 20th November 2009, 08:43 PM

Quote:

Originally Posted by john curl

I know that SY likes BLUE so that might be a factor for him. ;-)

I like the sense of humor.

PMA · 20th November 2009, 09:33 PM

Quote:

Originally Posted by PMA

We are just one ear. Variable FB gain at CFA amp might be a nice topic

Are we to invite Charles here?

SY · 20th November 2009, 09:37 PM

Quote:

Originally Posted by john curl

I I know that SY likes BLUE so that might be a factor for him. ;-)

I like the black ones better.

john curl · 20th November 2009, 11:27 PM

It might be a matter of taste, but I don't like the BLACK ones.

SY · 21st November 2009, 12:22 AM

Quote:

Originally Posted by john curl

It might be a matter of taste, but I don't like the BLACK ones.

They work fine for me. But I'm running tubes, so who knows?

My faves are the big, clunky Cinema Engineering switches set up as attenuators.

john curl · 04:22 PM

Well, this pretty much concludes my knowledge of volume control pots and their characteristics. There are, of course many other different variations of gain controls, including 'electronic' that include optical, bipolar, cmos and jfet, but I have never found one quite as good as the old fashioned potentiometer, when made properly.

michael12345 · 21st November 2009, 09:36 PM

Quote:

Originally Posted by john curl

Stick with tubes, Joshua.

Why?
I really enjoying A21 driving my pair of Parsifal Ovation by Canadian Verity Audio
Dreaming of upgrading to JC-1..

Effortless sound. Very detailed, clean.. Airy, precise imaging..

I compared A21+Verity against Vac and Octave.. Netherless it was the least expensive, it was the best

-- Michael

john curl · 22nd November 2009, 06:00 PM

The A21 is a successful design and will compare well to many tube designs. However, some people prefer tubes, and are more sensitive toward their qualities. They should stick with them, if it gives them the most satisfaction.

21st November 2009, 04:13 PM	#2998
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Well, this pretty much concludes my knowledge of volume control pots and their characteristics. There are, of course many other different variations of gain controls, including 'electronic' that include optical, bipolar, cmos and jfet, but I have never found one quite as good as the old fashioned potentiometer, when made properly. Last edited by john curl; 21st November 2009 at 04:22 PM.

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20th November 2009, 08:01 PM	#2991
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Demian, I found a dual 600 ohm Daven. Interested?

20th November 2009, 11:27 PM	#2996
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	It might be a matter of taste, but I don't like the BLACK ones.

22nd November 2009, 06:00 PM	#3000
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	The A21 is a successful design and will compare well to many tube designs. However, some people prefer tubes, and are more sensitive toward their qualities. They should stick with them, if it gives them the most satisfaction.

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