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Old 3rd July 2012, 10:27 AM   #11
DF96 is offline DF96  England
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Join Date: May 2007
If your coupling caps allow through too much subsonics then you can get problems you can hear from signals you can't hear. Having said that, the best place to limit LF is at the input where signal levels are lower.

Very large caps also create scope for capacitive feeback, especially if physically large 'audiophile' caps are used.
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Old 4th July 2012, 10:29 AM   #12
Sempati is offline Sempati  Netherlands
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Location: Amsterdam
Default Much better, but ...

Thank you all for your advise, gentleman.
Changing the Rk to 300 Ohms did the job.
The amplifier sounds much better now, with a CD signal on the input.
There is not too much power, but I liked the idea of using old stuff, and see what it is capable of, sixty years later.

One thing keeps puzzling me: the specification sheet says Rk, in push pull, triode mode, should be 150.
Do they mean 150 EACH or COMMON? Because that is what I did: divided 150 by 2 and chose the nearest available resistor value, being 82 Ohms.
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Old 4th July 2012, 11:09 AM   #13
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150 ohms common, thus 300 ohms each.
You should have multiplied instead of divided
Real tubes have top-caps
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