Octal equivalents for 6C45?

Ryssen · 8th March 2006, 09:10 PM

Is there any?

EC8010 · 8th March 2006, 09:37 PM

No. 6C45 is arguably the finest and latest expression of small signal triode technology. WE437A or their UK subsidiary STC's 3A/157M are better but they are both made of unobtanium. The WE416 contains both unobtanium and berylium, making it simultaneously expensive and poisonous.

jlsem · 9th March 2006, 01:51 AM

The C3g is a loctal pentode which when triode-connected is close with a mu of about 40 and an S of about 25K umho. Said to be more linear...

John

Ryssen · 9th March 2006, 09:39 PM

Quote:

Said to be more linear...

Maybe a god driver for the 6b4gSE?
Is it rare?

jlsem · 10th March 2006, 01:15 AM

Quote:

Is it rare?

Fairly common in Europe - I've often seen them sold by the case on German eBay in recent years.

http://cgi.ebay.de/C3g-C-3g-SIEMENS-...QQcmdZViewItem

Actually, the best deal out there in a driver for a 6B4G is this number:

http://cgi.ebay.com/6C4P-EB-6S4P-EV-...QQcmdZViewItem

http://frank.pocnet.net/sheets/112/6/6S4PEV.pdf

barossi · 10th March 2006, 07:27 PM

Hi,

do not forget the nice E55L in triode...

Greetings Barossi

Ryssen · 11th March 2006, 07:25 PM

I bought 4 6c4P-EB on ebay.....
Will try them out later.

Ryssen · 16th March 2006, 09:41 PM

How should I bias the 6c4P-EB?

rdf · 16th March 2006, 11:53 PM

The 6c4P or 6c45P? The first is a "double-anode kenotron". If the latter, how are you using them? My experience so far is 'best' depends on application. After lots of futzing around I finally settled on Kuei Yang Wang's bias current (though I doubt bias method) recommendations. As a driver for an EL84 SE (sledge meets fly), a red LED - about 1.75 Vdc - on the cathode bypassed with a 0.1 poly/film and a IXYS CCS for a plate load at ~10 ma. From memory second harmonic was around ~60 dB down, third about 30 dB lower and most everything else below -10 dB, noise below the limit of my measurments. Raising anode current lowers the 2nd but quickly starts pulling higher harmonics above the noise floor. Might account for the reputation for sounding 'steely' or 'solid state' you read sometimes.

Used with a 5k:8 James SE OPT as a headphone amp the sweet spot for me right now is around 175-165 Vdc on the plate and 20 ma anode current, also LED biased. Same deal re: harmonics. At very loud levels using low impedance, average efficiency headphones THD and IMD are below 0.2 %, HD by far 2nd harmonic and no harmonic above the 5th closer than -100 dB to the fundamental.

jlsem · 17th March 2006, 01:42 AM

Quote:

The 6c4P or 6c45P? The first is a "double-anode kenotron".

Check my earlier post: the 6C4-EB (6S4-EV) is a small triode similar to the WE417A but with slightly more gain and correspondingly lower transconductance. I would bias it with a battery and load it with a choke or interstage transformer as these types of tubes demand.

John

8th March 2006, 09:10 PM	#1
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Octal ekvalents for 6C45? Is there any?

8th March 2006, 09:37 PM	#2
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	No. 6C45 is arguably the finest and latest expression of small signal triode technology. WE437A or their UK subsidiary STC's 3A/157M are better but they are both made of unobtanium. The WE416 contains both unobtanium and berylium, making it simultaneously expensive and poisonous. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

16th March 2006, 11:53 PM	#9
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	The 6c4P or 6c45P? The first is a "double-anode kenotron". If the latter, how are you using them? My experience so far is 'best' depends on application. After lots of futzing around I finally settled on Kuei Yang Wang's bias current (though I doubt bias method) recommendations. As a driver for an EL84 SE (sledge meets fly), a red LED - about 1.75 Vdc - on the cathode bypassed with a 0.1 poly/film and a IXYS CCS for a plate load at ~10 ma. From memory second harmonic was around ~60 dB down, third about 30 dB lower and most everything else below -10 dB, noise below the limit of my measurments. Raising anode current lowers the 2nd but quickly starts pulling higher harmonics above the noise floor. Might account for the reputation for sounding 'steely' or 'solid state' you read sometimes. Used with a 5k:8 James SE OPT as a headphone amp the sweet spot for me right now is around 175-165 Vdc on the plate and 20 ma anode current, also LED biased. Same deal re: harmonics. At very loud levels using low impedance, average efficiency headphones THD and IMD are below 0.2 %, HD by far 2nd harmonic and no harmonic above the 5th closer than -100 dB to the fundamental. __________________ Ears aren't microphones.

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9th March 2006, 01:51 AM	#3
jlsem diyAudio Member Join Date: Jun 2003 Location: Dallas,TX	The C3g is a loctal pentode which when triode-connected is close with a mu of about 40 and an S of about 25K umho. Said to be more linear... John

10th March 2006, 07:27 PM	#6
barossi diyAudio Member Join Date: Oct 2003 Location: Hamburg area	Hi, do not forget the nice E55L in triode... Greetings Barossi

11th March 2006, 07:25 PM	#7
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	I bought 4 6c4P-EB on ebay..... Will try them out later.

16th March 2006, 09:41 PM	#8
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	How should I bias the 6c4P-EB?

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