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Old 8th March 2006, 09:10 PM   #1
Ryssen is offline Ryssen  Sweden
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Default Octal ekvalents for 6C45?

Is there any?
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Old 8th March 2006, 09:37 PM   #2
EC8010 is offline EC8010  United Kingdom
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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.
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Old 9th March 2006, 01:51 AM   #3
jlsem is offline jlsem  United States
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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
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Old 9th March 2006, 09:39 PM   #4
Ryssen is offline Ryssen  Sweden
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Quote:
Said to be more linear...
Maybe a god driver for the 6b4gSE?
Is it rare?
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Old 10th March 2006, 01:15 AM   #5
jlsem is offline jlsem  United States
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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
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Old 10th March 2006, 07:27 PM   #6
barossi is offline barossi  Germany
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Hi,

do not forget the nice E55L in triode...

Greetings Barossi
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Old 11th March 2006, 07:25 PM   #7
Ryssen is offline Ryssen  Sweden
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I bought 4 6c4P-EB on ebay.....
Will try them out later.
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Old 16th March 2006, 09:41 PM   #8
Ryssen is offline Ryssen  Sweden
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How should I bias the 6c4P-EB?
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Old 16th March 2006, 11:53 PM   #9
rdf is offline rdf  Canada
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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.
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Old 17th March 2006, 01:42 AM   #10
jlsem is offline jlsem  United States
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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
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