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Old 31st January 2003, 10:34 PM   #1
Sjef is offline Sjef  Netherlands
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Default Sovtek 6C45pi-E bias

Does anyone have any experience with the Sovtek 6C45pi-E tube.
I'm intending to use them in my transformer coupled preamp instead of the Raytheon 5842A and was wondering if anyone had a good advice about the bias operating point.

They wil be used with the existing power supply wich means that, depending on the current drawn, there wil be something btween 160 and 170V on the anode of the tube. The interstage transformer is a 4200/300 Ohm type rated at 30mA DC current.
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Old 31st January 2003, 11:03 PM   #2
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All I know (if I remember right) is that their data looks like either both halves of a 6080 in parallel (less dissipation), or a 6336's triode.
If you don't mind even more tubes than a 6AS7-based OTL, it's a good candidate.

Hmm, 4200 ohms sounds a bit high for it, and 300 ohms sounds a bit low.. I guess you're going for distortion or voltage, not power output, eh? (Unless that's the existing tranny and you just wanna reuse it, in which case the low Rp should swamp resonances and such very well. )

Tim
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Old 31st January 2003, 11:11 PM   #3
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Default YO...WAIT A MINUTE.

Hi,

Tim,I think you're confiding the 45 with the 41.

The 6C45PI is a driver tube while the 6C41 is a regulator.

For inspiration:

PAENG

Cheers,
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Old 31st January 2003, 11:28 PM   #4
Colt45 is offline Colt45  Serbia
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yeah, youre thinking of 6S41S tim :-)

6S45P-E (some people like to muck up the translation from cyr. to latin, and use latin mixed with made up stuff like "pi" damn that irks me.)

its a little 9pin triode, Pa = ~8w IIRC.
its supposed to be pretty close to one of the old WE tubes.. (437A i think? memory is dead here, and im too lazy to look at data of the WE ones..)

http://www.mif.pg.gda.pl/homepages/f...2/6/6S45PE.pdf
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Old 31st January 2003, 11:43 PM   #5
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Default CONFUSING.

Hi,

Quote:
(437A i think? memory is dead here, and im too lazy to look at data of the WE ones..)
Your memory is O.K.

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Old 1st February 2003, 01:11 AM   #6
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Default ODD FAMILY.

Hi,

And of course a pic of them both:

Ciao,
Attached Images
File Type: jpg 437a.jpg (46.5 KB, 2617 views)
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Old 1st February 2003, 02:05 AM   #7
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Oh yea...thx Colt

BTW he's the one who keeps talking about buying some on ICQ if it weren't for him I would've never posted and confused anyone

Tim
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Old 1st February 2003, 08:29 AM   #8
EC8010 is offline EC8010  United Kingdom
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6C45P is a stunningly linear valve. It wants >10mA of anode current before it wakes up properly, but can operate with quite low anode voltages (100V). There does tend to be a bit of grid current, so you have to be careful if you take liberties with the (150k max.) grid leak resistor. Because Cag is so high, you can't really use it as a gain stage unless you drive it with a cathode follower (or a moving coil cartridge) unless you don't care/can't measure the HF response. It makes a superb cathode follower, but you need a >100MHz oscilloscope handy to find and tame the oscillation.
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Old 1st February 2003, 05:09 PM   #9
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Default 6C45

Hi,

If the datasheets I found are in any way reliable this is also a very low noise valve.

Req 100 Ohm??.

Quote:
(or a moving coil cartridge)
EC8010,you wouldn't be using a MC headamp with valves as I do?

If so I'd be very interested to share scheamtics etc.


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Old 1st February 2003, 06:12 PM   #10
Colt45 is offline Colt45  Serbia
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Here's a graph I just pulled out of a russian datasheet
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File Type: gif 6s45p.gif (56.1 KB, 2530 views)
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