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increasing o/p impedance to match IT??
increasing o/p impedance to match IT??
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Old 8th July 2004, 02:24 PM   #1
AudioGeek is offline AudioGeek  United States
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Default increasing o/p impedance to match IT??

Question is this:

I have ECC99 mated with a 1:1/1 phase splitting transformer.

The ECC99's output impedance is too low and I have to add loading resistors on the secondary of the transformer to stablize frequency response.

Is there another way to match impedances without sacrifycing gain??

I think I need a 5K ouput impedance on the tube.

Can I partially bypass the cathode to bump up the output impedance from the 2.3k it is now to 5K?

Or is it better to leave it alone?

Thanks!!!
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Old 9th July 2004, 08:14 PM   #2
Eli Duttman is offline Eli Duttman  United States
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IMO, you should leave things as they are. A low impedance driving the trafo is GOOD for bass extension. Using resistors across the secondaries to control ringing, etc. is a tried and true technique.

BTW, what sort of circuitry is following the P/S trafo.
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Old 10th July 2004, 05:14 PM   #3
AudioGeek is offline AudioGeek  United States
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it is just connected to pp grids of 6B4G's...

Thats all.
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Old 10th July 2004, 07:15 PM   #4
Eli Duttman is offline Eli Duttman  United States
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PP 6B4Gs are fairly straight forward. Leave things as they are, with resistors across the secondaries correcting anomolies.
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