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Old 11th April 2005, 09:10 PM   #1
mr l is offline mr l  Australia
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Default 7586 nuvistor

hello,
does anyone have the lead identification for the above valve,I have electrical data but no lead id. any help would be appreciated,thanks.
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Old 11th April 2005, 09:18 PM   #2
SY is offline SY  United States
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http://frank.pocnet.net/sheets/049/7/7586.pdf
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Old 11th April 2005, 09:24 PM   #3
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I have a pair of those... equivalent to the classic 6CW4 IIRC. So yeah... use wherever a 6CW4 might be used...

Might well be better sold to the vintage radio crowd, IIRC they aren't that cheap these days. A 12AU7 is cheaper, more linear (IIRC) and easier to find sockets for.

Tim
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Old 12th April 2005, 12:44 PM   #4
mr l is offline mr l  Australia
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thanks for the replies, soon after I had posted i found an rca datasheet at this address:
http://www.pmillett.addr.com/tubedat...sterindex.html
the lead id makes more sense now
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Old 12th April 2005, 02:35 PM   #5
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Quote:
Originally posted by Sch3mat1c
I have a pair of those... equivalent to the classic 6CW4 IIRC. So yeah... use wherever a 6CW4 might be used...

Might well be better sold to the vintage radio crowd, IIRC they aren't that cheap these days. A 12AU7 is cheaper, more linear (IIRC) and easier to find sockets for.

Tim

the Nuvistor sockets show up on EBay from time to time. I used 6CW4's in 50MHz and 144 MHz converters back in the 1960's
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Old 12th April 2005, 05:46 PM   #6
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Quote:
I have a pair of those... equivalent to the classic 6CW4 IIRC. So yeah... use wherever a 6CW4 might be used...
Not quite, same pinout but 7586 has mu=35 and Cgp=2.2p, 6CW4 has mu = 65-70 and Cgp=0.9p. 7586 is actually similar to 1/2 6DJ8, 6CW4 is more like 6HA5 or other frame grid triodes. I've been able to sub 6CW4 for 7586 in CFs in HP3400 RMS meters, but you probably couldn't use a 7586 in an RF circuit designed for 6CW4 or for a plate loaded amplifier with gain of 40.

BTW, be careful about microphonics especially in the 5 - 15kHz range, you'll need some mechanical isolation.
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Old 13th April 2005, 09:25 AM   #7
mr l is offline mr l  Australia
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found 4 nuvistors & bases on ebay,in the process of building this design.http://www.tnt-audio.com/clinica/preamble_n.html any opinions?
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Old 21st December 2005, 09:38 AM   #8
Luke is offline Luke  New Zealand
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Hi MrL

have you built this yet? Im wondering if its good cos I want to build it.

cheers Arthur
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Old 6th January 2006, 12:11 PM   #9
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hi luke-sorry for the delay.
I had finished some months ago, had some problems with ground loop hum. after hours of cursing & tweaking it was cured.here it is.
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Old 6th January 2006, 12:28 PM   #10
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The valve bases were mounted on a bracket, so the pre amp stage connections are all point to point. I used precision resistors in the signal path, roederstein/vishay coupling caps,silver wiring & a "blue" alps pot. At the moment i only have one input wired with rg178 coax (single braid shield,silver plated copper) I will be trying different cables for each input connection (rg400 coax,pure silver wire) Of course the use of the exotic parts is not for everyone & worthy of debate,
to my ears it sounds good-very good in fact, clean with good sound stage & imagery. I didn't know what to expect while building it because I had just been using the variable output of my cd player into my power amp, but i'm impressed.
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