Scott -

IF your tower and rotator can handle the additional wind-load,
the common (popular) practice is to place a 3-element 6-meter yagi above your tri-band (20-15-10) antenna.

Joel R. Hallas, W1ZR wrote an article to do exactly what you desire in September 2012 QST magazine.
Here is that article (PDF), courtesy of DX Engineering (who sell parts you need for DIY Build)
http://static.dxengineering.com/pdf/Hallas.pdf

W1ZR's design uses parasitic coupling to a single element.
This concept was first described by Gary Breed, K9AY and published in The ARRL Antenna Compendium, Volume 5.  Gary called it a coupled resonator antenna.
I have known Gary since mid-1970s, when he was teaching Electrical Engineering at Bradley University and doing broadcast radio/TV consulting for D.L. Markley & Associates.

The W1ZR Tri-Band yagi antenna was a Wilson Electronics SY33.
That antenna looks like the popular Mosley TA-33, but with wider element spacing.

Heathkit SB-220 Compendium
by John White, VA7JW
http://www.orcadxcc.org/content/sb220_compendium_va7jw_rev1.pdf

Jim Coville, W7RY makes a QSK board for many HF amplifiers, including Heathkits.
http://www.qrz.com/db/W7RY

The Vacuum Relays (popular Jennings RJ1A-26S, Kilovac HC-1, and Gigavac GH-1)
can be acquired from Max-Gain Systems.
http://www.mgs4u.com/RF-Microwave/vacuum-relays-SPDT.htm

Lou Tristao founded Tristao Expanding Masts which became Tri-Ex in 1985, after the sale of Tristao Towers creating U.S. Tower.  The Wilson crank-up towers, for his son, were his designs.
Lou Tristao, KG6VY (sk) passed away September 2001.

Karl Tashjian worked at Tri-Ex Tower Corporation from 1985 to 2000.
While at Tri-Ex, he was the engineer of record for hundreds of towers, working on tower designs for the amateur radio, cellular, FM, TV, AM radio, and the US Army.

In 1997, International Tower was formed from Tri-Ex Towers and S&G Communication. ITI specialized in tall towers for the broadcast industry. While at ITI, the engineering group which Karl was in charge of engineering and designed several candelabrum towers approximately 2,000 feet tall, 1860' tower 10' face tower in Louisiana, a 1,000 foot tall candelabrum in downtown Atlanta guyed at 35%, along with many other tall heavy towers.

In January of 2000, SpectraSite Broadcast group purchased International Tower Inc. SpectraSite closed the engineering offices at the Tri-Ex plant in Visalia in October of 2000, at which time Karl began consulting full time.   The old Tri-Ex Towers Corp. was dissolved in California so Karl Tashjian incorporated as Tri-Ex Towers Corp. in California in Jan. 2002.  
In Jan. 2003, Karl changed the name of the corporation to Tashjian Towers Corporation.
Tashjian Towers does NOT manufacture the complete catalog of earlier Tri-Ex Towers.
http://www.tashtowers.com/crankup.html

Tashjian Tower Accessories
http://www.tashtowers.com/pdf/Accessories2012.pdf

Tashjian Towers use a different fold-over mechanism
http://www.tashtowers.com/pdf/tiltover.pdf

START by reviewing the 1976 Tristao Tower Catalog
http://www.mikeponte.net/hamradio/manuals/1976%20TRISTAO%20CATALOG.pdf

LOOK at the Lightweight Tristao CTL Crank-Up GUYED Towers.
These series of towers had different base, like the one in your photos.
This CTL series are NOT self-supporting towers.
CTL-188, CTL-341, and CTL-388 are 5 sections.  

U.S. Towers no longer mfg. the CTL series.
Get your tape measure, all the measurements are in the catalog!

TRISTAO HG52SS Tower : W1TR
http://www.glagowski.org/radio/Antennas%20VHF%20Tower%20Electric%20Winch.htm

TRISTAO CZ454FS Tower, 54 feet : N4LDM
http://november-four-lima-delta-mike.webs.com/apps/photos/album?albumid=12579357

===
US Tower Corporation was formed from the purchase of Tristao Tower in 1985, which invented and developed the telescoping tower nearly 85 years ago.  Lou Tristao founded Tri-Ex, after the sale of Tristao Towers.
http://m.ustower.com/

In 2003, US Tower expanded through internal growth to establish a northern Kansas location, closer to their central and east coast amateur, corporate, and military customers.
MFJ moved/closed Hy-Gain Towers manufacturing based in Lincoln, NE a few years earlier.

US Towers Corporation in Lincoln, Kansas was officially formed in 2006. U.S. Tower opened their Alabama manufacturing plant, near Huntsville, in the 2011 focusing on southern USA, military, and Carribean markets.

You can contact U.S. Tower at:

U.S. Tower
1099 West Ropes Avenue
Woodlake, CA 93286
Phone: 559-564-6000
Email: sales@ustower.com

The 50th Anniversary of that historic speech, Ich_bin_ein_Berliner is June 26th this year!
http://en.wikipedia.org/wiki/Ich_bin_ein_Berliner

"Lass' sie nach Berlin kommen" ("Let them come to Berlin") was also pronounced in that same 1963 JFK speech,
which Ronald Reagan paraphrased in 1987.
It would take another 26 years (November 9, 1989) for that to occur.
http://en.wikipedia.org/wiki/Brandenburg_Gate#Berlin_Wall_and_its_fall

For context, on June 12, 2013 -- it will have been 26 years since Ronald Reagan
made his famous speech in 1987.
“ General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate! Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall! ”

==
w9gb

Carl -

I spotted that item on eBay earlier, but did not mark or watch it.  Now I know who got it!

I seem to remember another mfg.(Sonar BR-21) in early 1960s producing an amplifier that looked like this Pace unit.  BR for Business radio.  1950s LMR did have 25 to 27 MHz allocation, in addition to the Low Band VHF LMR allocation above 30 MHz.
http://www.cbtricks.com/Amp/sonar/br21/graphics/sonar_br21_cover.pdf

Many CBers and radio amateurs have forgotten that the number of CB licenses issued equaled the radio amateur licenses issued by mid-1960s.

In that period, vacuum tube Citizens Band, Class D radios (mobile & base) were an inexpensive alternative to Land Mobile Radios (Part 90) for small buinesses, such as taxi services, school districts, bus companies, cement companies, construction companies, etc.  EF Johnson Messengers were very popular in 1960s.

Consumer operators did not appear until early 1970s with the first solid-state CB radios appeared.  
The CB craze started after the 1973 Arab Oil Embargo, when finding an open gas station on longer trips was important.  This was then followed by national 55-mph speed limit and 1979 Iranian revolution (second Oil embargo).

K5OG has one of the more comprehensive web pages on Signal-One.
http://www.k5og.com/signal%20one.html

SignalOne Technical Notes
http://www.hamanuals.com/S1/Common/TNindex.html

Bill KA4GAV has a good Signal One web page
http://www.hamanuals.com/s1root.html

Part datasheets
http://www.hamanuals.com/S1/Common/Datashts.html

SignalOne owners registry
http://www.k5og.com/Registry%20Main%20Page.htm

SignalOne Parts
http://www.hamanuals.com/S1/CX7%20Sale%20stuff/Sale.htm

The OnStar system combines the features and services of the Global Positioning System (GPS) and Cellular/Mobile telephone/data networks, first developed in 1970s and deployed in 1980s.

OnStar originally used the Analog Cellular network (800 MHz, AMPS) in the United States.

OnStar migrated to the Digital Cellular network (800 MHz, CDMA),
as most of the original AMPS network was turned off in the United States on Febuary 18, 2008.
Today, GSM and CDMA and their derived follow-ons are the predominate networks.
http://en.wikipedia.org/wiki/Advanced_Mobile_Phone_System

The GPS Receiver in your automobile operates in the "L-band".  
There is NO transmit capability in this GPS usage band.
Specifically:

L1   1575.42 MHz   Coarse-acquisition (C/A) and encrypted precision (P(Y)) codes, plus the L1 civilian (L1C) and military (M) codes on future Block III satellites.
L2   1227.60 MHz   P(Y) code, plus the L2C and military codes on the Block IIR-M and newer satellites.
L3   1381.05 MHz   Used for nuclear detonation (NUDET) detection.
L4   1379.913 MHz   Being studied for additional ionospheric correction.[citation needed]
L5   1176.45 MHz   Proposed for use as a civilian safety-of-life (SoL) signal.

===
The Sirius / XM satellite radio in your automobile operates in the "S-band" frequencies.
These services were allocated 25 MHz of bandwidth in 1990s, with rollout of services in late 2001.

The Sirius/XM service is received from satellites in Earth orbit as well as Ground transmitters in heavy populated areas (skyscrapers or terrain that would block the satellite signal).

Sirius Radio: 2,332.50 to 2,345 MHz
XM Radio:  2,320 to 2,332.50 MHz

===
Amateur Radio has frequency allocations at 1200 MHz, and shared allocations (ISM) at 900 MHz and at 2,400 MHz adjacent to WiFi 802.11b computer networks.

Despite attempts by Japanese radio manufacturers in early 1990s to expand US radio amateurs into these allocations .... majority of USA amateurs did not move to the microwaves (> 1 GHz) with the larger radio communications and computer network industries.
Antenna manufacturers have largely moved their new product manufacturing to 700 MHz and higher frequencies.  
Commercial VHF/UHF products are historical artifacts of the 1950-1980 development period.

GC Electronics in Rockford, IL still has Electronics Chemistry Set Supplies  :-)
http://www.gcelectronics.com/order/catdisplay.asp?CatID=3

They have Red GLPT and Red-X Corona (Allied catalog page)
http://www.alliedelec.com/chemicals/coatings-paints/?dsNav=N:4294856057-4294965270

Shop around for best prices.  
Since California, RoHS, carrier shipping restrictions, and related regulations
prices have doubled with new compliant formulations (and labeling) over past decade.

Todd -

The pricing would be less than Collins receiver, but the fact that it was one of the last amateur radio receivers from Hammerlund and compatible with Collins S-line transmitters -- may command higher price, due to rarity, by some collectors.

It is a very nice layout, the analog dial reminds me of the later Atlas Radio 210 model in 1970s
designed by Herb Johnson.
http://www.qsl.net/on6ab/Pictures.html

DEDICATED RF Web site functions properly, from my ISP and tablet.
http://www.dedicatedrf.com/

Mark -

I have looked at your PC board.  Your assessment is correct that a prior event (lightning?, HV arc?) caused damage to this PC board.  You have LOST copper on a trace and have carbonization on the fiberglass board, due to a arc or short.

IF this was my TenTec 425 Titan Amplifier, these are the steps.

1.  CALL TenTec Parts & Tech Support.
INQUIRE if a BARE PC board (of this same board # and version) for this Titan is available.

2.  IF AVAILABLE, PURCHASE IT.  THEN TEST Components.  
Good components can transferred and soldered to this New Board, then Replace BAD or FAILED components.

3. IF NOT AVAILABLE, THEN you need additional work to Repair this PC Board for usage.

As long as you have BLACK, Carbonized fiberglass -- that is a circuit pathway.
High Voltage on this PC board eliminated conductive paints as a repair solution.

The trace missing copper (vaporized) needs to be properly repaired -- especially when used for High Voltage !
Noman Mir, BEST SOLDERING INTRUCTION, has short OuTube videos demonstrating proper PC Board Repairs.  SolderingGeek is the name he uses on YouTube.
http://youtu.be/KJBi7YO5UN0

Repairing circuit traces:
http://youtu.be/ozH2F3AX8BY

Pace Soldering and BEST sell PC Board repair kits (thin plated copper lands and traces) that can be applied with adhesive for a correct repair.
http://www.solder.net/products/pcb-repair/trace-repair-kits

This requires HandsOn / Elmer training for mastering these skills (This is an Artisan skill set).

The Hammerlund HQ-215, the first and only solid-state receiver produced by Hammarlund, was designed in the mid-1960’s by Lester Earnshaw, but did not go into production until 1967. This amateur-band receiver was compatible with the Collins “S” line units which employed the same frequency generating scheme, thus making it capable of functioning in the transceive mode with the Collins transmitter. This receiver was produced in limited quantities.

Hammerlund HQ-215 photographs
http://www.isquare.com/personal_pages/hq215.htm

When I inquire about antennas to new or unknown city/county jurisdictions that I have moved to (or plan to), I ask about installation of OFF the AIR (OTA) Television and FM radio antennas.
IF asked questions by the city/county authority, I indicate my desire NOT to have cable TV (don't watch all those channels, why should I pay for them).

I often counter to queries (or restrictions)by the authority with a request for the written/published municipal ordinance/code covering that verbal statement (or employee's personal bias/opinion).
This is VERY EASY to do when you are NEW to the community.  IF the public employee is rude or uncooperative, I ask for their name before I leave.

Icom IC-2KL HF Amplifier Owner's Manual (Icom Japan - Support)
http://www.icom.co.jp/world/support/download/manual/disp_down.php?SWT=&ID=20010101467&GNR=Options&TYPE=I&PDNM=IC-2KL&INQWORDSWT=No&INQWORD=

RL1 (T/R relay) for the Icom 2KL HF amplifier is located on the right side (looking at front of radio).

The relay should have a readable part number, for original datasheet and substitution search.

Takamisawa Electric (later acquired by Fujitsu) was one of Icom's Japanese suppliers for this relay.  
Here is a list of various models of Fujitsu power relays
http://www.fujitsu.com/us/services/edevices/components/relays/power/

Icom America Technical Support may be able to provide details of original part (specs, mfg, etc.)
http://www.icomamerica.com/en/support/default.aspx

Scott at MTS should be able to advise for appropriate Japanese part substitution.
Scott has a substantial backlog, ~ 7 weeks, SO be patient in correspondence or queries for assistance.
http://www.angelfire.com/biz2/mts/