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Old 23rd April 2002, 11:01 PM   #1
hifi is offline hifi  Sweden
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Default what do you tube gurus think about this?

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Old 24th April 2002, 12:46 AM   #2
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Good preamp. But remove the electrochemical condenser, bypassing the cathode of the 2nd stage. Power supply of heaters must be DC, stabilized.

Regards, P.Lacombe.
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Old 24th April 2002, 12:54 AM   #3
hifi is offline hifi  Sweden
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ok... why should i remove the bypass cap?

/micke
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Old 24th April 2002, 01:25 AM   #4
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Topology seems to be OK. At the expense of incurring your wrath, I have to say that it is not my cup of tea.

I guess, the purpose of this preamp is for use in a band and when the band is not playing you would like to play CD or radio through your stage amp. Am I correct?

Why do you need to raise the cathode voltage on the input tube? I am referring to the 47K resistor. If you remove this resistor, then you may not need the 10nF input capacitor. I do not prefer cathode followers in general unless you want to run long cables from the preamp.

Mohan
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Old 24th April 2002, 01:42 AM   #5
hifi is offline hifi  Sweden
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oh.. I woulndt know its not my design it is called REMUS and was phublished in Audio Video (a swedish mag in early 90:s)

and the circuit is rumored to sound really good (and meassure well for a tube circuit)

/micke
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Old 24th April 2002, 02:00 AM   #6
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Micke,
I agree with both of the previous posts:
--Drop the cathode follower at the input. There are a number of reasons to use a follower, but for the life of me I can't think of one to justify the use of one as an input buffer. One at the output is fine. (Incidentally, I'd consider raising the 100k at the output to 1M--it's there to drain DC off the back end of the coupling cap at turn-on, which is fine, but it will also be in parallel with the Zin of the amp/crossover and constitutes an unnecessary load.)
--Omit the cap for the cathode. The gain will drop when you do so, but you'll not only avoid an electrolytic, you'll pick up a bit of local degeneration (aka feedback) which will reduce distortion. These days, you don't really need a lot of gain in a preamp.

Grey
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Old 24th April 2002, 02:28 AM   #7
hifi is offline hifi  Sweden
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ok, ill try that...

does anybody here have any info on the russian triode 6cc41 ??

/micke
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Old 24th April 2002, 08:29 AM   #8
argo is offline argo  Estonia
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Quote:
Originally posted by hifi


does anybody here have any info on the russian triode 6cc41 ??

/micke
I guess you meant 6c41c ?
Here is couple of links I have bookmarked.

http://www.mclink.it/com/audiomatica/tubes/6c41.htm
http://www.tubes.ru/techinfo/GlassTubes/6s41s.html


Argo
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Old 24th April 2002, 09:01 AM   #9
hifi is offline hifi  Sweden
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nope i mean theese:

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1725339664

/micke
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Old 24th April 2002, 09:35 AM   #10
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Default 6cc41

Hello,

why donīt you ask the seller, Gintaras Sakemas is always helpful. Think he can scan the original data sheet for you.

Good Luck,
Regards from germany,
Reinhard

Ad on: Look at www.tubes.ru, glass tubes and then
6N2P. You find the 6CC41. Looks very similar to a 12AX7. Little higher transconductance and internal shield at pin 9.

Reinhard
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