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/

It only requires reading the FT-8000 Service Manual (English) with its block diagrams, schematics, and parts lists.
http://www.ko4bb.com/Manuals/Yaesu/Yaesu_-_FT-8000R/21_Interconnection%20Diagram.jpg

Backlighting is provided by FOUR Lamps on the LCD/Panel board.
http://www.ko4bb.com/Manuals/Yaesu/Yaesu_-_FT-8000R/35_LCD%20PCB.jpg

The Exploded radio diagram shows the PANEL and CONTROL boards and locations.
http://www.ko4bb.com/Manuals/Yaesu/Yaesu_-_FT-8000R/05_Exploded%20View.jpg

As you can see and read from the LCD / PANEL schematic diagram,
22 ohm resistors drop the supply voltage to 7.2 V for these 8 Volt lamps (backlighting of LCD).
http://www.ko4bb.com/Manuals/Yaesu/Yaesu_-_FT-8000R/34_LCD%20Circuit.jpg

PANEL UNIT (PC Board), F3601101

D84001 - LCD
PL4001-4004 - Lamps, 8 Volts, 60 mA

Mark,

TenTec had production changes to the Titan 425 power supply and RF assembly.
IF you read the PC Board ID numbers, this can be passed on to TenTec tech support for specific schematic/PC board layout details.

The HV Board in your TT Titan 425 power supply is a LATE version OR third party replacement unit.
The capacitors are SNAP-IN variety with the HV diode string and bleeder resistors all on 1 board.

Follow TenTec technical advise on the resistance (ohm) measurements.

Mark -

It's all in TenTec 425 manual (link in first response),
just look through parts list and X-Ray view of PC Boards.

BE SAFE, with HV.  Disconnect from AC mains and have a HV kill stick.
WHY?  In case bleeder resistors failed, capacitors could be charged (and kill you),

DEAD MEN are not around to tell stories or discuss their mistakes.

Mark -

There were early and later versions of this amplifier, check board numbers.
Correct manual is available from Ten-Tec Service. 865-428-0364.
http://www.tentec.com/downloads/manuals/Model%20425%20Titan%20Manual.pdf

Another Tentec Titan 425 owner, restoration process.
http://www.pj2t.org/ccc/notes.on.titanI.htm

Bob Hutchinson, N5CNN
http://www.hamradiomarket.com/articles/Titan%20P%20Hybrid.htm
Comments on the Titan 425, rectifier board, and the replacement
HV power supply board (HV-2) by WD7S - which is no longer sold as a kit (only assembled).
http://home.earthlink.net/~wd7s/hv-2.htm

TenTec used CDE Electrolytic Capacitors with Screw terminals.
Specifically, they used the CGS series, 400 mfd, 450 VDC.
http://www.cde.com/products/aluminum-electrolytic/

CGS401T450xxx .. The last 3 alpha-numeric characters (xxx) are mfg week and year.
PHOTO in a TecTec Titan 425 HV supply
http://www.pj2t.org/ccc/titan.I.power.supply.caps.nomenclature.jpg

CDE Catalog - CGS series
http://www.cde.com/catalogs/CGS.pdf

MOUSER has Eight IN Stock (The CGS series were also used by Alpha amplifiers).
Typically these capacitors cost $25 to $30 each (last time I bought them in 2005).

SHOP around with CDE distributirs for best price, Contact TenTec and
Harbach Electronics (Ohio) for price quotes -- for best price.

Mouser Part #: 539-CGS450V400
CDE Part #: CGS401T450R5L
Page 738, Mouser Enhanced Catalog
    

Here is the schematic diagram for the Shure 526T desk microphone,
of that same era, that used a dynamic element microphone.
http://bama.edebris.com/download/shure/526t-preamp/Shure%20526T%20Preamp.pdf

Altai likely used a readily available Japanese transistor (2SC).
===
Last address, now in Taiwan, as of 2009.

ALTAI COMPONENTS LTD.
Email: altaitwn@ms24.hinet.net
Phone Number: 886-2-23250760
Fax Number: 886-2-27000818
Zip Code: 10683

13F-1, 26 Tun Hwa S. Rd., Sec. 2, Taipei
Taiwan, Republic Of China
http://www.altaitwn.com.tw

Primary Export Products: Turntables, Record player and turntable parts, Loudspeakers,
Other loudspeakers, Amplifier sets, Audio equipment parts, Aerials and aerial reflectors,
Microphones and stands, Other line microphones and stands, Audio equipment parts,
Machinery and apparatus

Let us know how it works out.

gb

Icom ID-800H Product Page
http://www.icomamerica.com/en/products/amateur/dstar/id800h/default.aspx

Icom ID-800H Instruction Manual (PDF, English)
http://www.icomamerica.com/en/downloads/DownloadDocument.aspx?Document=154

Chapter 1 - Panel Description
Page 6 - DATA socket (8-pin mini-DIN on rear panel) Pin Assignment

On the ID-800H, the Icom radio designers doubled up the 6-wire PACKET interface and the 3-wire RS-232 serial interface, due to limited space.

For RS-232 (which your GPS would use): 2, 4, 7
For PACKET (6-pin mini-DIN outline in 8-pin socket): 1, 2, 3, 5, 6, 8

Chapter 11 - Digital Mode Operation
Page 91 - GPS Operation
Cable used: Icom OPC-1384 (8-pin mini-DIN to DE-9)
http://www.multitech.net/developer/products/multiconnect-ocg/hardware/multiconnect-ocg-d/rs232-serial-port-pinout/

The terminology, used in the Icom documents, for pin function descriptions are a bit counter-intuitive.  RS232 IN means into the attached device and RS232 OUT (GPS) is output from the attached device.

Your GPS must support: NEMA 0183 output at 4800 baud, RS-232.
I chuckle at some comments .... How good are your soldering skills for this small connector?

DIY BUILD HINT: LOOK for surplus 8-wire extension cables (with molded 8-pin connectors) for old Apple Macintosh or Apple LaserWriter printers. It is also used on a game console.  OLD computer parts stores at Purdue University have stashed them somewhere.
They are all sold on eBay.  I always have a couple 6-pin and 8-pin mini-DIN pigtails in my cable box !
Easier to cut cable in half and wire up a DE-9 connector this way !!

The 8-pin mini-DIN was used as the serial connection (Apple Laserwriter) in the Apple Macintosh (circa 1984) ... and Gwyn Reedy, W1BEL (sk) founder of PacComm, used that same 8-pin mini-DIN connector as a RS-232 serial port (used same Apple pin assignments) in 1989 for the PacComm PSK-1 (400 bps PSK telemetry from Oscar 10 and 13).

IF you desire DIY, then build a breakout box with the 6-pin mini-DIN (Packet/DATA),
which is same PS/2 connector for mice & keyboards AND
the 3-wire RS-232 DE-9 connector or GPS, terminal, etc.

Good Luck with project.

w9gb

Leson was manufactured by Altai of Japan, many years ago (1980s).
Rare to find one in North America.
http://www.gumtree.com.au/s-ad/skye/audio/leson-tw-232-radio-power-desk-microphone-extinct/1008456640

The EU Freebander / CB web sites seem to have information you desire.
http://bfreebandingtalktheplanet.runboard.com/t2466

This Australian CB Radio web site, has the Manual that shipped with microphone.
http://www.ozcbradios.com/images/stories/manuals/leson/tw232_sml.pdf

Personally, I reverse engineer these unknown and poorly documented orphans.
You can then post your schematic and findings for the larger radio community.

David -

70 cm is a wide allocation for the United States (420 - 450 MHz), while our northern neighbor,
 Canada, can only use the 430 - 450 MHz segment.
http://en.wikipedia.org/wiki/70-centimeter_band

It is not uncommon to see some early 70 cm antennas designed for the 420 - 430 segment
versus the 440-450 MHz segment.

Since you are in ITU Region 1, your segment is: 430 - 440 MHz.
==
Earlier eHam.net discussion on this topic.
https://www.eham.net/ehamforum/smf/index.php?topic=67639.0

Current Cushcraft A270-10 design & production (MFJ ownership)
http://www.cushcraftamateur.com/Product.php?productid=A270-10S

Cushcraft A270-10 Antenna Manual (circa January 1994)
http://victrolla.homeip.net/wo5s/junkpile/Cushcraft/a27010s.pdf

K7MEM VHF/UHF Yagi Antenna Design
http://www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf.html

Sergey -

Based on the age of this radio, >10 years since actively produced,
some parts have been discontinued.
http://www.universal-radio.com/catalog/fm_txvrs/tm741a.html

START with the Kenwood TM-741A/E Service Manual (PDF).
http://www.ko4bb.com/Manuals/Kenwood/Kenwood_TM741.pdf

Parts List on Page 61, Exploded (Disassembled) Views of Radio on Page 105.
This will give you the specific Kenwood part numbers that you need.

This is the Kenwood Russian web page
http://www.kenwood-rus.ru/home/

Your QTH may be closer to the Eastern Asia Kenwood, than Western Europe.
You can Select from Kenwood's Global Web Page.
http://www.kenwood.com/index.htm

Kenwood Electronics Europe B.V.
Amsterdamseweg 37,
1422 AC Uithoorn,
The Netherlands
http://eu.kenwood.com/
TEL : +31(0)297-519900      
FAX : +31(0)297-519990

Kenwood UK handles amateur radio / communication products for Europe
http://www.kenwood-electronics.co.uk/products/comms/

Kenwood UK has their parts handled by:
http://www.kenwood-electronics.co.uk/support/spare_parts/

Fullers Ltd
Riverside View
Wickham Market
Ipswich
IP13 0TA
Tel no: +44(0) 1728 746500
Fax no: +44(0) 1728 746900
E-mail: angie@kenwoodspares.co.uk
Website: www.carradiorepairs.co.uk

===
In North America, we have two Kenwood Parts outlets.

East Coast Transistor (Kenwood Parts - Eastern NA)
http://www.kenwoodparts.com/parts/find.php

East Coast Transistor Parts, Inc.
2 Marlborough Road
West Hempstead, NY 11552
USA
Phone: +1-800-776-2626
Phone: +1-516-483-5742
Fax: +1-800-733-5904
http://www.eastcoasttransistor.com

Pacific Coast Parts (Kenwood Parts - Western NA)

PacParts Inc.
15024 Staff Court
Gardena, CA 90248
USA
Phone: +1-800-262-1312
Phone: +1-310-515-0207
Fax: +1-800-782-5747
http://www.pacparts.com

D&A was out in Scottbluff, NE.  They tried various gimmicks and flaunted their product,
but FCC continued to pursue and D&A eventually closed business (bankrupt).

Personally, I would just strip for parts.  Forget using about 1950s glass TV sweep tubes,
 pick a newer tube, designed for HF or VHF radio amplification (which is what you want).

The Russian GI-7b ceramic triode has its own web page.  Look at what other radio amateurs,
around the world, are doing with this capable (HF to 1 GHz range) surplus tube.
http://gi7b.com/

Richard -

There is no provision (or correct parts) for 20 meter operation, as noted by Steve (WB2WIK).
Notice lack of band switch, small coils and tune/load capacitors?
http://www.cbtricks.com/Amp/d_and_a/mdx_200/tour/index.htm

IF you desire to use it for a DIY 20 meter amplifier project, get ARRL or W6SAI Radio Handbook from late 1950s or 1960s, for various plans -- when they wound coils and bent sheet metal for DIY fabrication.

As I noted a couple months ago, D&A used two AC transformers that were common late 1950s/early 1960s Stancor (Chicago mfg.) used for vacuum tube audio amplifiers and some SW receivers.
 Far too many obsolete TV sweep tubes for 21st century usage,
especially when surplus Russian 400-500 watt ceramic triodes (circa 1990) sell for $25 !!