[Heathkit] Apache

Wed, 25 Feb 2004 22:13:10 -0600

Hello All,

I would suggest replacing ALL the caps in the audio section with orange
drops. There are internet mods out there that suggest changes in value as
well. I followed the mod suggested by Glen, K9STH, who contributes to this
list and others in a big way. I restored my Apache to factory specs with the
exception of Glens's suggestions on the audio caps. I get great reviews on
air for the audio on my Apache. I would guess that if there is enough
interest here that Glen would post his mods to the list.....or with his
permission, I would email copies of his article to those who need it

73
Kevin
KG9IL

----- Original Message -----
From: "Peter Markavage" <[email protected]>
To: <[email protected]>
Sent: Wednesday, February 25, 2004 1:39 AM
Subject: Re: [Heathkit] Apache

> What happens if you set the front panel Clipper(gain) control a few
> degrees lower? The Clipper control should normally be turned up only a
> few degrees from its zero position. The other assumption here that I'm
> making is that you have already determined that all the tubes in the
> modulator have been checked and are good, the bias to the modulator tubes
> is correct, and no one has diddled with the modulator wiring. The
> modulator stages have some fairly decent gain so you shouldn't have to
> turn the audio gain control to far up from zero. Pull the 6AL5 to
> eliminate any clipping action.
>
> Pete, WA2CWA
>
> On Tue, 24 Feb 2004 22:26:07 -0600 "Dean Livingston" <[email protected]>
> writes:
> > Hello Apache owners,    I have a TX-1 which I have restored and I'm
> > having audio tbl.   When I turn up the audio gain (the one behind
> > the Key jack) with the clipper level set at about 9 o'clock, the
> > audio starts to break into a HOWL.   Is this usually resolved by
> > replacing the two 2mf and 10mf caps?
> > Dean Livingston
> > K9FLO
> >
>
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