• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

New preamp

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wd40

wd40

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Joined 2003
balstudio.com
Complete a preamplification utensil lately £¬Please everybody the teachings a way of looking at a thing ¡£Thank £¡
 

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NickC

Member
Joined 2001
promitheusaudio.com
You cannot drive a 20k with this current configuration as your Rp of the tube is going to be around 17-25k(from memory) the tube is only going to be 4k when it as a cap bypass the cathode resistor. even then it cannot drive a 20k load. You will need to work with a mu follower taking the output from the top triode/mosfet for the low output impedance. Trying cascodes for ccs single do not sound so good
 
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Positron

Member
Joined 2003
Sure you can

One can run a 6922 into a 20k load without a mu follower. Rp should be low, like bypassing the cathode. Just don't run 20 feet of ICs though.

I have heard it at Mr. Martin DeWulf's house powering a Pass X-250 amp (22k load or so if I remember correctly), and also works with the Belles 350.

Mr. DeWulf also thought so.

Cheers.
 
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