[Heath] [Heathkit] HW100/101 curiosity

[Dick KF4NS]

Ok guys, sure sounds reasonable. Thanks to all for your input. While I am at it, after the problems and 
restoration are now complete, I notice that frequently there is a strange squeal or screech coming from 
the speaker while on the dummy load during tune-up. Everything is tied down tight and over the past 40+ 
years I never heard this before. It must be an oscillation of some sort but am going to try a suggestion 
in the manual regarding the driver neutralizing wire but it relates to jumpy tuning; still could be a 
possibility. I am sure I must have moved that wire at some point during the repairs. The finals are not 
yet neutralized but are the original ones from before the crash (6293s added in 2003). Well, we will see.
73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "Bwana Bob" <wb2vuf at verizon.net>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Cc: "Heath puck list" <heath at puck.nether.net>; <heathkit at mailman.qth.net>
Sent: Wednesday, May 23, 2012 10:26 PM
Subject: Re: [Heathkit] HW100/101 curiosity


| Dick:
|
| Well, this is my opinion:
|
| Tuning the het osc coils in receive mode  gets you in the ballpark, so
| the receive tuning is preliminary. The tuning for maximum transmitter
| output is more critical. Just tuning on receive will not maximize
| transmitter output.  Just tuning on transmit, one might miss the peak
| entirely.
|
| Even though the jumpers between the finals are short, they do have some
| inductance. Heath probably wanted to keep the impedance to ground very
| low so as to prevent the jumper inductance from causing parasitic
| oscillations in the final.
|
| Bob WB2VUF
|
| On 5/23/2012 8:15 PM, Dick KF4NS wrote:
| > Hi guys,
| >
| > A couple things have always bugged me so I will ask the questions now and see what I can determine.
| >
| > In the alignment, I have always wondered why, after all the time spent adjusting the HET. OSC. coils 
to
| > the spec, why do we need to start all over again when we do the transmit alignment ??
| >
| > Also, in the finals, pins 1, 4 and 6 are tied together between the two tubes, so why the redundancy 
with
| > three .005 mfd bypass caps on each tube? Would it not be just fine to have only one cap for both 
tubes
| > instead of six caps ?  The tube spacing is so close I see no need for the multiple caps.
| >
| > 73, Dick KF4NS
| > St Petersburg, FL 33714 USA
| > Keep The Glow!
| >
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