Start with the Shure Microphone support documents (User Guides) and
your Heathkit HW-101 Assembly and Owner's Manual.

Shure 450 User Guide
This model is DUAL impedance, and should be set to Hi-Z for usage with HW-101.
http://cdn.shure.com/user_guide/upload/2004/450_User_Guide.pdf

Shure 450T User Guide
http://cdn.shure.com/user_guide/upload/406/us_pro_450t_ug.pdf

Shure 450 Series II - User Guide
http://cdn.shure.com/user_guide/upload/405/us_pro_450seriesii_ug.pdf

Microphone connections shown on page 115 of your Heathkit Manual.
Figure 1-7 shows wiring to Electro-Voice Hi-Z desk microphone.
The Audio and PTT grounds are shared.

Heathkit HW-101 Manual
http://gmcotton.com/Ham_Radio/MISC%20Manuals/Heathkkit/HW-101.pdf

The original 2-pin microphone connector is:  Amphenol 80MC2M
http://www.ultrawebb.com/OHP/miccon.htm

http://www.kenselectronics.com/lists/micplug.htm

Likely a metric threaded screw (M2 or M3).  Computers use M3 x 5mm metric screws for attaching DVD/CD drives within computer cases.
The M3 size in 6 mm length can be found at and Ace or other hardware stores
 that has the Hillman small parts drawers.
http://www.hillmangroup.com/locations.html

Good hobby shops have these smaller metric screws.  eBay and Amazon are filled with suppliers.

MTS -
http://www.angelfire.com/biz2/mts/

Icom IC-251
The IC-251 is basically a more advanced version of the IC-211.
The Main unit is almost the same. The PLL and Logic are very different.
The biggest issue with the 251 is the CMOS logic. It "glitches" and is very static sensitive.
The CPU and Expander are no longer available new.
This Icom radio model is generally it is very reliable, and needs very little maintenance.
http://www.angelfire.com/biz2/mts/Oldies.html

The Alpha 89 was produced from 12/1992 to 9/2000, 408 units were built during this time.
These units were much like the Alpha 86 (only 274 of this model were built), but with many updates and refinements.
http://www.kk5dr.com/old86.pdf

For the Alpha 89, PIN diodes provide T/R switching, and QSK type capability.
The PIN diodes have been the most discussed issue with the Alpha 86 and 89 models.

KK5DR coverage
http://www.kk5dr.com/89.htmp
==
Mark Killmon, K4SO took photos of his Alpha 89 QSK conversion in 2010.
https://picasaweb.google.com/kfourso2/Alpha891162010

He used the QSK board from Jim, W7RY.
http://www.qrz.com/db/w7ry

Intel is taking the wraps off Haswell-based chips,
five Core i7 laptop processors today and 12 quad-core Core i7 and Core i5 desktop chips today, June 1st.
These are LGA 1150 socket processors, will not fit into earlier LGA 1155 socket motherboards!

Graphics for the Haswell-based chips will be twice as good as the graphics for last year’s Ivy Bridge chips.

More information will be released by Intel on Tuesday, June 4th at the Computex trade show in Taiwan.
http://t.co/9RjSkNNM5n

These new quad-core desktop chips will have MSRP from $192 to $339.
They run from 3 gigahertz to 3.9 gigahertz, and consume between 35 to 84 watts of power.
The fastest chip is a $339 Core i7-4770K chip, which consumes 84 watts of power and runs at 3.6 gigahertz, and you can overclock that to 3.9 gigahertz.

Preliminary pricing for the Intel Lynx Point (series 8 PCH) motherboards will be virtually same as current Panther Point (series 7 PCH) motherboards.  STEP C2 of the Lynx Point PCH, that resolves a USB 3.0 issue, are expected to be seen in motherboards near end of summer/Labor Day.

The ALLOY formulation makes all the difference.

Conductivity Of Metals Sorted By Resistivity
This table uses 100% IACS for Pure Copper.
http://eddy-current.com/conductivity-of-metals-sorted-by-resistivity/

100% : Pure Copper
64.94% : Aluminum, 99.99%
40% : Aluminum Alloy, 6061-T6
2.50% : Steel, Stainless 304
2.30% : Steel, Stainless 316

==
Electrical resistivity and conductivity
http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity

Go find a nice Miamisburg, OH amplifier product (Drake).  

You will easily find 1960s / 1970s CB amplifiers -- that have NO value (seller is happy to take your $$).  Documentation or support, non-existent (hey its illegal).  

Old 1960s Radio and ARRL Handbooks have basic schematic diagrams, but glass TV sweep tubes have not been mfg. (Western Europe, USA, and Japan plants shut-down) since early 1980s.

You have to remember that licensed CB operators outnumbered amateur radio licensed operators by the mid-1960s --  by the time the 1970s CB Craze (Bubble), millions of non-technical US consumers had a CB.  This created the garage industry for building/selling illegal CB amplifiers in 1970s.

Repeater Build has an entire section on the Motorola Syntors.
http://www.repeater-builder.com/motorola/syntor/syntor-index.html

Skip Hansen WB6YMH and Lee Dusbabek K7KAJ developed the Xcat board.
It plugs into the Syntor X in place of the original Motorola module and provides complete funtionality plus it is programmable by a PC using a Windows-based program. A Syntor X plus the Xcat is a much more capable base station or remote base radio than an X9000 - and much cheaper!
There is a Yahoo Group for Xcat.

Photo of Xcat board installed in Syntor
http://www.repeater-builder.com/motorola/syntor/xcat/installed.jpg

Mike Blenderman, K7IC web page covers about everything.
http://www.onfreq.com/syntorx/

John -

Great. 
Your experience with Alpha-Delta is typical (stand behind, support product).
Since these coil windings are closely spaced, a failure of wire enamel insulation (breakdown due to UV, mechanical damage [hail], etc.) can cause these issues.

Even with wire antennas, regular inspections (annually) are good practice.

The price of concrete is not cheap these days.  That amount of concrete (cubic yards) seems a bit low.  
The concrete PSI for some tower bases is also more than this (up to 3500 PSI, depending on tower and engineering).

Yes, you hi-jacked the thread for an different type of tower (Pirod: self-supporting, solid rod legs).

The BASE for a Self-Supporting tower (Pirod in your case) is STRUCTURAL,
supporting entire 50 feet of tower above the ground (mass, weight) and
Resistance to FORCE of the Wind (Wind Load).

Towers and the Design Engineering Spec (revision of TIA-222 when tower first designed or new) do vary based on tower type (guyed, self-supporing, crank-up).
EACH COUNTY (or PARISH for LA) in USA has a stated minimum Wind Speed Rating.

The Property & Casualty Insurance companies and County Building departments know these figures from the latest revision.  It takes into account the frequency and magnitude of hurricanes, tornados, derechos and downbursts (straight line winds).
http://en.wikipedia.org/wiki/Derecho
June 2012 Derecho events
http://en.wikipedia.org/wiki/June_2012_North_American_derecho

http://en.wikipedia.org/wiki/Downburst

The Ten Most Common Tower Building Mistakes
Written by Steve Morris, K7LXC
http://www.championradio.com/common.tower.building.mistakes.html

Revision G of the TIA-222 Standard contains many new provisions that are having a significant impact on communication structures.

TIA-222 Revision G, Structural Standards for Communication Towers
Frequently asked questions answered by Dave Brinker, Vice President of Engineering for ROHN Products, LLC.
Dave is a member of the TIA-222 Executive Committee and was Chairmen of the Rev G Editorial Committee.
An Interview with Dave Brinker, ROHN Products, LLC.
http://www.primuselectronics.com/pdfs/1q09_tia-222_rev-g_standards.pdf

TONO 9000e manual can be found at MODS.DK
http://rwkzdqe.mods.dk/manual.php?brand=_other

I have seen variances in this requirement (rebar cage), based on building permits.
IF you have local building approval authorities for your permit, this will be reviewed.
Have you talked to concrete/cement contractors and suppliers in your area?  

Another consideration, if your local building permit authority requires a UFER in this tower base.

w9gb

Replacement Dial Covers are available from many sources.

Mark Palmquist at Retro Radio Repair (Georgia)
http://jmpalm.home.mindspring.com/

Radio Daze (New York)
http://www.radiodaze.com/default.aspx

Bill Turner (St. Louis)
http://www.dialcover.com/dialcovers.html

West-Tech Services (Ohio)
Acquired the former business of Doyle Roberts, Arkansas
http://www.west-techservices.com/dial.htm

John --

This has been reported occassionally, by operators running 1 kW amplifiers.
In SOME of those cases, the operator was trying to operate in a band segment --
 where the antenna had not been tuned (usage w/o antenna tuner).
Some owners have reported a change in wire enamel and coatings on these coils for better UV protection and heat dissipation.

CONTACT Alpha-Delta Communications in Kentucky, they should be able to assist you with replacement.  
They MAY ask that you ship both coils to them for QA review/examiniation.

Alpha-Delta Communications
214 2nd St
Manchester, KY 40962
(606) 598-2029

Alpha-Delta Communications - Warranty Policy
http://www.alphadeltacom.com/policy.html

Note: You MUST obtain an RMA number before ANY product returns.

For technical questions only on wire dipoles and sloper antennas:   w8alphadelta@gmail.com>

For tech questions on all other Alpha Delta products, including shipping status or ordering details
(including antennas): jfburns@windstream.net

The marketplace responded ... which is why Microsoft Blue is a priority.
My Apple iPad tablet works fine, I don't need a desktop version.

Even WW2 had major blunders --- A Bridge Too Far.
==
John -

It is a trade-off, as many things are in the purchase decision.
The H77 motherboard that I used for initial DIY CaseMod design/plan,
has a few issues - such as:

Mini-Card slot does not have USB functionality on connector,
so the Intel Advanced-N 6235ANHMW Wi-Fi WLAN and Bluetooth 4.0 mini card does not work properly.  
Bluetooth function uses the USB connection, so it is dead on these boards.  
Designers focused on SSD usage of slot, not Wireless.
-- That is corrected on H87 motherboard, with loss of one USB port on internal headers.

I have a working DP55WG mother board (LGA1156) in my main computer running Win7 --
 so I am not in a hurry for building replacement in a recently acquired 10-year old HP a-series mATX case (Xmas 2003 gift to my late mother).

Yes, very expensive all-in-one RTTY / CW console in 1970s/1980s made by TONO Corporation (Japan).

TONO CORPORATION
98 Motosoja-Machi,
Maebashi, Gunma, 371-0846 (tel:371-0846), Japan
tel 027-253-6955 (tel:027-253-6955)
Fax 027-253-1885 (tel:027-253-1885)
http://www.tono.jp

The TONO THETA 9000 series was manufactured in 1985.
http://www.radiomuseum.org/r/tono_theta_9000.html
YOU TUBE video of the TONO THETA 9000E in operation.
http://youtu.be/S4bGzPkXDYU

TONO THETA 7000E (Radio Museum)
http://www.radiomuseum.org/r/tono_theta_7000e7000.html

TONO THETA 7000E Manual (circa 1975)
http://bosland.home.xs4all.nl/assets/tonodocumentation/TonoTheta7000E.pdf

Today, the DSP sound card and home computer has more processing ability (not an option in 1970s) --
BUT purpose built equipment has its place and usage.
==
BTW, Most Tono machines are equiped with batteries for memory-backup.
Some even still contain the original batteries.
If you get your hands on one of these its wise to open up the case and remove the old batteries.
Old batteries will start to leak and may damage internal components.