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Old 9th September 2004, 09:37 AM   #11
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Quote:
Originally posted by Geek
"Starved plate" is a great way for fuzz, but also adding noise. Would you run a transistor thingy in your stereo line with 1 volt on the Vcc? 45Va is basically the same thing.

IMO, if you need line-level amplification, dump the 12AX7 and think 12AU7, 12AT7, 6DJ8 or my favorite, the Russian 6N1P

I agree with your comments, I am just explaining why the guys who designed that circuit used +45V, I mean they intentionally did that to starve the tubes.

I also love the russian 6N1P, have lot's of them coz they come in relatively cheap here locally.

Any circuit you have for 6N1P tubes you wanna share?
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Old 9th September 2004, 10:46 AM   #12
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Quote:
Originally posted by JojoD818
Any circuit you have for 6N1P tubes you wanna share?
I use them mainly in White-CF or mu stages, as they seem to be ideally suited to that

Here's a linedriver mu-stage I made for my Akai AT-2400 tuner:
http://www3.telus.net/small_business/Geek/TunerOut.png

My microphone preamp contains the same output, but in a White-CF:
http://www3.telus.net/small_business...reampFINAL.png


Quote:
Can you tell me / show me the circuit of a solution, based on 12AU7, 12AT7, 6DJ8?

Watch the link of the MIC100/MIC200 I've posted at the start of this threat. As you can see, the chassis is VERY small.
Y'know, I re-read your original post and Fred's McTube is a good little box. Pop an 'AT7 in it and she goes from "warm" to "crystal"

You can also try a mu stage based on the 6DJ8. Check the link I posted for Jojo, reduce the Va from 250 to 120 and you'll be OK.
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Old 9th September 2004, 10:51 AM   #13
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Oh, forgot to mention, the 12AT7 is also a good White-CF:

http://www3.telus.net/small_business...7-White-CF.png

Slightly less "grumba" since the cathode of the 'AT7 is teeny-tiny compared to 6N1P. But it has a beautiful, mellow quality that is unique. If I were building a linedriver for a person who loved Blues/Jazz, I'd make them a 12AT7 CF or mu.

One caveat with an 'AT7 - they loooooove to motorboat. Decouple the power supply line good!
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Old 9th September 2004, 03:29 PM   #14
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Thanks for the circuits! Now My 6N1Ps will have some use. I like the microphone preamp too.

JojoD
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Old 9th September 2004, 05:32 PM   #15
TobWen is offline TobWen  Germany
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Quote:
My microphone preamp contains the same output, but in a White-CF:
I've got a +48V PSU & mic ... what do I need to modify that is accepts the voltage on the grid?

Edit:
I also have found a very interesting project ... but it uses amplification:
http://www.siliconchip.com.au/cms/A_30804/article.html
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Old 9th September 2004, 11:13 PM   #16
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Quote:
Originally posted by TobWen


I've got a +48V PSU & mic ... what do I need to modify that is accepts the voltage on the grid?
Just add a DC blocking cap. Performence degredation is minimal.


Quote:

Edit:
I also have found a very interesting project ... but it uses amplification:
http://www.siliconchip.com.au/cms/A_30804/article.html
Cute! I like it
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Old 10th September 2004, 04:22 AM   #17
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Geek,

I also saw that you have a mic preamp with a compressor (separate schematic) and wowow! Have you actually tried using it? Can you describe how it sounds? Seems that all the parts are locally available here except for the LED/LDR part. Maybe I can just build a discrete LDR/LED for such use?

JojoD
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Old 10th September 2004, 07:07 AM   #18
TobWen is offline TobWen  Germany
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Quote:
I also saw that you have a mic preamp with a compressor (separate schematic) and wowow! Have you actually tried using it? Can you describe how it sounds? Seems that all the parts are locally available here except for the LED/LDR part. Maybe I can just build a discrete LDR/LED for such use?`
perhaps the WHAT-compressor?
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Old 10th September 2004, 12:04 PM   #19
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Geek's tube mic preamp is here: http://www3.telus.net/small_business...reampFINAL.png

and i i think this is the compressor: http://www3.telus.net/small_business...ssorDriver.gif

Note: This is from Geek's circuit collection...
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Old 10th September 2004, 12:06 PM   #20
TobWen is offline TobWen  Germany
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did'nt you see my question?
it's according to this preamp!

I've got a +48V PSU & mic ... what do I need to modify that is accepts the voltage on the grid?
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