[Heathkit] Popping DX-40

[Gary]

Ed:
    Try looking at the DX-40 at night with no lights on, in the dark. You 
mite be able to see a small flash. Its worked for me, ...some times.
Regards,
Gary
----- Original Message ----- 
From: "Ed - K9EW" <k9ew57 at gmail.com>
To: "Bill Stewart" <cwopr at embarqmail.com>; "Heathkit List" 
<heathkit at mailman.qth.net>
Sent: Thursday, October 29, 2009 2:49 PM
Subject: Re: [Heathkit] Popping DX-40


> Take a look at the bandswitch and the function switch to see if
> there's anything happening there.
>
> -ed, k9ew
>
> On Thu, Oct 29, 2009 at 10:13 AM, Bill Stewart <cwopr at embarqmail.com> 
> wrote:
>>
>>
>>
>> Good morning all,
>>
>> I have a DX-40 which constantly puts out a popping noise in the rcvr. Its 
>> about 2/sec and varies....once in a great while it will stop. But I can 
>> flip back to tune, then to standby and it cranks up again. It does NOT do 
>> it in the tune or off position...all other positions it does. I have run 
>> an antenna input wire to a test rcvr and probed around and it seems to be 
>> maxing out around the electrolytic area. But this is not a very good test 
>> due to coupling to the wiring. When carefully listening under the 
>> chassis, by ear, I can hear a slight arcing but can't tell just where its 
>> coming from...being careful not to stick my ear on something hot. All 
>> tubes are removed except the 5U4GB. Here's what I have tried so far:
>>
>>
>>
>> Replaced the 5U4GB
>>
>> Sub'ed the lytics
>>
>> Re-soldered 5U4GB socket connections
>>
>> Disconnected DC load coming off the center of the bleeder/lytic 
>> connection and the load coming off the output side of the choke and also 
>> the 1Kohm/.005 cap hooked onto the ctr tap lead
>>
>>
>>
>> The xmtr does work, as I made a couple contacts with it yesterday.
>>
>>
>>
>> None of the above cured the problem. I'm beginning to get that feeling 
>> that its the power trans. Anyone had a similar problem and what was the 
>> outcome? I vaguely recall something about raising the trans. above the 
>> chassis with plastic spacers and screws (internal arcing to the 
>> case?)....was this the solution to this problem? Another question...if it 
>> is the trans., can anything be done at this point, before a complete 
>> failure, to fix the trans....such as heating it up to move the tar around 
>> (probably not a good idea). Any suggestions would be helpful.
>>
>> Thanks...73 de Bill K4JYS
>>
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