[Hammarlund] HQ-180(A) Audio Fidelity Mod - Question

[Rodney Bunt]

Dallas,

I have been looking at your Audio Fidelity fix.

The 620K resistor from Plate of Output tube to cathode of first Audio tube, would upset the tube
first audio bias. Would it not make more sense to insert a capacitor in this "feedback" circuit,
thus blocking the DC component ?

Using a .01uF would give a 6bB rolloff at 25Hz, now that is tons of bass....

Your thoughts ?

Rodney
VK2KTZ




--- Dallas Lankford <dallas at bayou.com> wrote:
> I never liked the so-called auto-response audio filter in the 180 series
> receivers.  It makes the audio sound tinny because of the bass cut and
> boosts the treble which enhances distortion products, just what we don't
> want.  My downloadable mod which fixes these problems is in The Dallas Files
> at the web site below.
> 
> http://www.kongsfjord.no/
> 
> _______________________________________________
> List Administrator: Duane Fischer W8DBF
> ** For Assistance: dfischer at usol.com **
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