[Heathkit] 6146A's Arrived (was DX-100B on Phone - bad audiodistortion / oscillation)

[Carl]

Since the Cgp is a very small amount and affects 10M the most it has always 
been the band to neutralize most any TX or amp on. The effect and tendency 
to oscillate decreases with decreasing frequencies.

Since the DX-100B in question appears to be unstable.....period.... Id 
suggest a bad ground connection, an ineffective bypass cap or a combination.

Did this rig ever work properly on all bands?  Was something done to it by a 
CBer or some hammy hambone mods?

Does the owner have a scope at least, capable of operating to 30 MHz?

Carl
KM1H


----- Original Message ----- 
From: <manualman at juno.com>
To: <heathkit at mailman.qth.net>
Sent: Wednesday, December 07, 2011 2:18 PM
Subject: Re: [Heathkit] 6146A's Arrived (was DX-100B on Phone - bad 
audiodistortion / oscillation)


> Since the issue is in both modes, I would less inclined to believe it's
> in the audio section. Also, the neutralizing wand gimmick was used in the
> Apache (6146/6146A). Its adjustment (moving it closer or further away
> from the finals) was most noticeable only on 10 and 15 meters. For the
> oscillation issue, I also would review the clamper circuitry and clamper
> tube.  Also, if possible, fire up the rig on its side, and listen for any
> audible, or visual activity, on the underside in the component areas of
> the driver and final sections, when the oscillation is occurring.
>
> Pete, wa2cwa
>
> On Wed, 07 Dec 2011 12:12:39 -0500 Rick Poole <wa1rkt at arrl.net> writes:
>> At 12:10 PM 12/7/2011, Ross Stenberg wrote:
>>
>>  >>>>>
>> >At one time did you say that it did not oscillate in CW?
>> <<<<<
>>
>> So it appeared at first, but the problem is there in CW also.  It is
>>
>> much more prevalent in phone.
>>
>> Rick WA1RKT
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