Need preamplifier schematic/suggestions

[Jon the Grimm]

I'm currently working on collecting the parts to make a power amplifier. I would like to simultaneously build a preamplifier, but as I know absolutely nothing about them, I need a schematic suggested to do what I want.

All it needs to do is enable my mp3 player to drive the power amplifier to full power, It should be very simple and use a single 6sn7 per channel. Bass and treble controls would be nice but not necessary. Anybody have info on what I am looking for?

 

[Wavebourn]

mp3 player can drive a pair of output tubes directly. What a clean sound!

 

[Jon the Grimm]

Pair = SE?? Will it work with a push-pull Williamson amp too? I just want to make sure because I read somewhere else in this forum that power amps typically need 1-2 volts rms and also that mp3 players may only put out .5v.

 

[Miniwatt]

I just designed -and put together- a 6SN7 preamp this evening, I switched it on not an hour ago. At first I was quite impressed, but it is clearly burning in, too early to make statements about the sound. I suspect the cathode capacitors are mostly to blame.
It's a SRPP btw, I'll post a schematic later if that's helpful.

Oh, and Wavebourn was joking..

 

[Jon the Grimm]

Very funny. I take it a preamp is necessary then?

Yes Miniwatt, I would like to see your schematic.

 

[Wavebourn]

Oh, and Wavebourn was joking..

No, I was not.

If say EL84 needs 10V RMS on 200K grid leak resistor, what is the power?
Can MP3 player give much more? However, a matching transformer may be needed. But you can obtain them in EDCOR Electronics Corporation

One more option: 6J52P tube. No input matching transformer needed.

 

[SY]

Very funny. I take it a preamp is necessary then?

No, it's not. The Williamson is more than sensitive enough to take a line output from an MP3 player. All you need to do is put in a volume control on the power amp, unless your player already has one.

 

[Bandersnatch]

hey-Hey!!!,
given the usual amp sensitivity, consider something with a mu of less than 10. Single triode tubes like 12B4 or 6AH4 or perhaps triode-strapped EL86. Knowing what the amp looks like would help a great deal.

Would that perhaps be Dr. Grimm?
cheers,
Douglas

 

[soro]

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

http://www.diysong.com/diysong/viewtopic.php?f=7&t=5002
it is my new preamp use 12AU7 or 6DJ8 and 12V single power supply.

 

[soro]

An externally hosted image should be here but it was not working when we last tested it.

It is my new preamp it can be headphono amp.

use 12V single power supply.