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croccodillo 25th July 2006 09:00 AM

Input level

Just a stupid question:

I'm playing with the math and testing some circuits for my future tube amplifier (I have no time to build it completely, but I'm making some tests and learning how tubes work).
It will be a SE, parallel feed topology.
The amplifier will be an integrated one, and will have few inputs:

1. CD player

2. Digital JukeBox (a sort of big Ipod I built, with a 10" touchscreen and a 120Gb HDD where I can store all my MP3 songs, all enclosed in a nice wooden case)
The output device is a original ISA Soundblaster (line output)

3. My TV set (basically DVD player)

My question is: Do you know the output level for each of the above? I mean, I have to decide the input level for my amplifier, but I'm not sure on it (1Vpp, 2Vrms, what else?).

What about input sensitivity of your amplifiers?

Next question:
Using a KT88 as output device, which is the best working driver for it (12AT7, 12AU7, 6SN7, ECC99)?
I'd like to use only one stage for the driver, so the gain has to be taken in consideration with respect with the input level...

PS: In the meantime I'm building also a quasi-resonant Switched Mode Power Supply for the amp using the TEA1507 chip, I will show it here when ready...


pinkmouse 25th July 2006 09:12 AM

Why not just measure them?

croccodillo 25th July 2006 09:22 AM

Good answer, but I burned my scope (I made a BAD mistake) and I cannot measure them with my multimeter: I would wait for a new scope.


rpapps 25th July 2006 09:28 AM

Option 2.
Read the specifications for each device.
They should quote output level.
Select lowest level source and set gain to suit.

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