Note: in my text below, I meant to say 12BY7 and 6CA7/EL34s. Pete On Tue, 3 Feb 2009 15:16:34 -0500 Peter A Markavage <[email protected]> writes: > Pulling the clipper tube just removes the diode action. It doesn't > eliminate the pass-through connections. Does this Apache modulator > still have two adjustable controls (one labeled Gain on the front > panel and one labeled Level, which was behind the key jack)? If > Level control (adjusts audio drive to the 12BY7) is set to high, > any clockwise adjustment (beyond a few degrees above the off point) > of the front panel control can set the second half of the 12AU7 and > 12BY7/EL34s into oscillation. Of course, a major modulator mod that > might have been done (parts pulled, new parts, changed wiring, etc.) > may have turned these two controls into different functions from > what they were originally intended to be. > > Pete, wa2cwa > http://www.manualman.com > > > > On Tue, 3 Feb 2009 11:11:56 -0800 (PST) John King <[email protected]> > writes: > > There is NO Clipper circuit in this Apache. The clipper tube was > > removed and the tube socket is empty. This seems to be what many > did > > as a modification. I did have the redrawn schematic showing the > mod > > but have misplaced it. Thanks for the assistance. 73, john, k5PGW > > > > > > > --- On Tue, 2/3/09, Peter A Markavage <[email protected]> wrote: > > > > > From: Peter A Markavage <[email protected]> > > > Subject: Re: [AMRadio] Ultrasonic feedback > > > To: [email protected] > > > Date: Tuesday, February 3, 2009, 8:54 AM > > > The front panel "gain" control is for the speech > > > clipping gain. If you > > > turn it up too high, depending on the setting of the > > > "real" audio gain > > > control which is located behind the key jack, the modulator > > > will squeal. > > > This is barring any other electrical or component issues. > > > > > > Pete, wa2cwa > > > http://www.manualman.com ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body.
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