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Re: Legacy 300b with CCS

80.41.11.82

Posted by Peter Pan on February 8, 2007 at 18:47:52

In Reply to: Legacy 300b with CCS posted by Red on February 8, 2007 at 03:13:47:

Hi,

Some comments.

In a DHT the heater is part of the signal circuit. Different regulator chips are readily audible, the linear tech LT1085 is recommended out of those tried, over more generic.

Also, for some strange and counter intuitive reason using the POSITIVE pole of a DC DHT filament as AC return and the negative pole as DC return sounds better than the other way around or using a humbalancer pair of resistors or pot.

IIRC the original Legacy Article recommends such a setup, not the one from ANUK.

Given that all the PSU capacitors (screen grid on driver, anode on driver, anode on 300b) are part of signal path and that (of course) the cathode bypass capacitors are just as well, avoiding all electrolytic capacitors in these positions and selecting "non-electronic" sounding types there will have a big impact as well.

Finally, as others mention, a CCS with a pethode operated as pentode is not the best idea.

Best regards PP

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