[Heathkit] HW100/101 curiosity

Thu May 31 15:41:29 EDT 2012

Thanks Bob, I did some redressing of wiring in the finals since I had made several repairs around the 
sockets. I also dressed other cables and wiring elsewhere. I also positioned the driver neutralization 
wire. Then I began to tune up on all bands again, 10M on down to 80M. All went well until I got to 80M 
and discovered that it would not load at all. I checked the HET OSC voltage and it was -.2V. I stuck the 
alignment tool in there and it popped up to -3.3V, Then 80M loaded fine except for the hissing in the 
speaker. All other bands made no speaker noise at all.

This is where I opened the window and threatened to toss the %$&* radio out on the lawn, the HET OSC coil 
for 80M and 40M was hanging loose !!! I found that after removing that coil, one wire was broken, the 80M 
slug was locked tight. I tried contact cleaner, LPS1 greaseless lube, mineral spirits, Lacquer thinner, 
100% silicone spray, then I gave up. It is cracked but still cannot remove it. I have a spare slug but 
how do I get the cracked one out? Am I correct in thinking there is no wax in these Heathkit coils? Seems 
clear in there so why is the slug stuck? Are the forms threaded or does the slug make it's own threads?

Strange thing about this, I never had a slug in this rig ever get even slightly tight. What makes these 
suddenly lock  up? If I can get the bad slug out, I will reattach the loose coil wire and glue the form 
back in there, hoping to solder it back in and get 80M working again (and 40M since they are together in 
the form)

----- Original Message ----- 
From: "Bwana Bob" <wb2vuf at verizon.net>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Cc: <heathkit at mailman.qth.net>
Sent: Tuesday, May 29, 2012 9:41 PM
Subject: Re: [Heathkit] HW100/101 curiosity

| Dick:
|
| If the peak on the driver tuning is erratic, it means that the driver
| stage needs to be neutralized.  A squeal, coming from the final, not the
| speaker, is a parasitic oscillation, requiring final neutralization.  If
| the squeal comes from the speaker, spray the relay contacts with contact
| cleaner. Sometimes there is a carbon buildup on the contacts which will
| result in incomplete muting.
|
|                     73,
|
|                     Bob WB2VUF
|
| On 5/24/2012 7:15 PM, Dick KF4NS wrote:
| > 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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