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Old 9th April 2004, 04:45 PM   #11
grataku is offline grataku  United States
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Opsss, sorry.
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Old 10th April 2004, 10:27 AM   #12
MIKET is offline MIKET  United States
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Default Similar Idea

Built a similar circuit using a 6C45pi as a driver tube and the results are very nice. I await my Mundorf Silver Oil caps which should arrive next week. Present coupling cap is a Wima MKP.
THe use of a CCS may be something you would like to consider as well.
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Old 10th April 2004, 03:02 PM   #13
Taffi is offline Taffi  Norway
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What is CCS ?
Interesting design and I have also been thinking about using the 6C45PI as well as 417A (as I have laying around), but because I have been told that both the 417A and the 6C45PI could sound a little clinical and too much "hifi" I starts with the 6N7 which someone tells are a sweeter sounding tube.
What about yours?
Does it sound light, dark, mudled, bright, soft, hard, open, closed in or what do you think of it?
Maybe your use of carbon resistor makes it less hifi sounding?
Very easy to try another thow when we have just a tw0 tube design and in my amp there is also socket's for both 6N7 types and 417A types input/driver tubes.
And I also have Mundort Supreme, Mundort silver in oil and Jupiter caps to try as coupling caps.
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Old 10th April 2004, 06:17 PM   #14
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Default 6N7

The 6N7gt was developed as a driver/o/p bottle just for audio use, from what I can gather, while many other valves that have a great following were developed as general purpose or even as voltage regulators, so the 6N7gt should sound great, so long as its used within spec.--This is my choice for my No-2, all Octal OTL!
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Old 12th April 2004, 08:36 AM   #15
MIKET is offline MIKET  United States
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Default CCS

A CCS is a constant current source.
There is one in my schematic connected to the plate of the 6C45PI.
Other places to read more about CCS.
http://home.zonnet.nl/horneman/mosfet.htm
http://www.pacifier.com/~gpimm/
I am quite pleased with the CCS that is on the schematic above.
The 6C45PI is very quiet, I would call it very open and detailed, like someone took a pillow off the front of the speakers. The only problem is 6C45PI tend to oscillate, if you use them for a gain stage be sure to tie all grid leads back through resistors and the same for the cathode leads(see schematic). I have had better luck with Reflektor 6C45PI tubes than with Sovtek 6C45PI tubes.
The best thing is for you to go for the sound you are looking for, don't be afraid to experiment. If it sounds good to you and the parts are run within thier operating parameters, then there is no need to change it. The carbon comp resistors have no magnetic conductors or end caps, which to me seems to effect sound more than what the resistor is actually made of.
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Old 23rd May 2004, 10:34 PM   #16
Taffi is offline Taffi  Norway
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Still working on my 6N7-300B amp.
It begins to sound nice, but I do get a to bright sound with more treble than I prefer.
Any suggestions on why?
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Old 24th May 2004, 10:34 AM   #17
MIKET is offline MIKET  United States
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Default Sound a bit too bright

The sound may be a bit bright because of the passive components.
I use Mundorf Silver and oil caps, and carbon comp resistors and the balance seems just right.
My driver tube is a 6N45PI with a CCS and no bypass cap on the cathode, but otherwise our circuits are very similar.
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Old 24th May 2004, 08:28 PM   #18
Taffi is offline Taffi  Norway
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I also use Mundorf silver in oil (o,47uF)and also have Jupiter to try .
Just to check I am also going to buy some Jensen cu.
But of course there is many components in the power that can be better.
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