Tube DIY Asylum

No such commercial attenuators exist, IMO.

69.156.196.162

In Reply to: RE: Same 1/10 rule of thumb applies. posted by Stephen R on April 27, 2008 at 04:55:41

Hi.

As I suggested earlier, it got to be custom built.

But if yr upstream programme source is of very low impedance, e.g. 100R, which not uncommon. A properly desgined/built triode cathode follower can typically gives you down to 40R.

So you can choose 1KR ladder type attenuator. Again no commercial attenuators give you constant O/P Z. But if the I/P Z of your amp is high anough, I don't see any Z issue.

In fact, I am giving some thoughts on designing a ladder type attenuator with constant O/P Z with no inductors involved.

Let's see.

c-J

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