These have a good reputation and I'm in a microphone mood. This unit is also called the "chrome lollypop" Planning on making a web page about microphones, but the immediate need is for the ICOM 706 radio.
The T-UG9 stand has a 3 contact socket at the top that holds the microphone and a 3-pole double throw push and hold to talk switch.
There are a number of different microphone elements that might be here, the most common being the MC-321x Crystal element called the D-104.
In early applications of the mike with tube type transmitters the crystal directly drove the transmitter. But later radios needed a much lower (the crystal is about 50 k Ohms) impedance so the two transistor amplifier was added in the base to lower the output impedance and slightly shape the audio response.
There are a couple of problems that are obvious. The 1/4" stereo phone plug is crushed and the Eveready No. 216 9 volt battery is very dead but it has NOT leaked.
What does the R or E switch do?
Ans from Guy B.
Relay or electronic switching.
The stock crystal element has a poor reputation for sound quality. It can be improved using a lot of audio filtering, but a better approach is to replace the element.
Heil Sound makes the HC5.1 retrofit kit for the D-104. May 2013
Audio - military audio connectors
Aviation Headsets -
Bell System 302 Dial Phone - the "I Love Lucy" phone, this is the first phone I can remember. The first phone to have all the parts in one case.
Bell System 500 Dial Phone - basis for the REN Ring Equivalence Number that's on the label of all modern phones
Bell system 2500 Touch Tone phone -
Beltone 12D Audiometer
CA-67 Interface Unit, Automatic Data Processing Stardynamic 5895-01-443-5081
EE-8 Telephone Set
E-89-A Telephone Repeater
EM200 EM200 Ear Mike
GR650A General Radio GR 650-A & GR 1650B Impedance Bridges
GRsound General Radio Sound Measurement Instruments
GRA-39 Radio Set Remote over phone wire
H161 H-161E/U Headset used in Crew Served Vehicles (2 connectors)
H250 H-250/U Handset with Noise Canceling mike
H251 H-251A/U Headset (earphones)
H33 H-33F/PT Handset
H350 H-350/U Handset
Harris RF-5980-SA001 Amplified Speaker
Harris TS1000 ADSL Test Set -
Harris TSP-21 Telephone Test Set Plus (like but set, but belt-clip & operators headset
Home Theater - 7.1 Surround Sound - Voice Of The Theater Speakers (very efficient)
HP204 HP 204B Audio Oscillator from HP 3350 Carrier Test Set (AN/USM-181 Telephone Test Set
HP241A HP 241A Audio Oscillator w/Radio Buttons
HP415E HP 415E SWR Meter - 1 kHz tuned voltmeter
HP4260 HP 4260A Universal Bridge
HP 4261A LCR Meter
HP427A HP 427A Voltmeter AC & DC Volts & Ohms
HP4274_4275_LCR lHP 4274A & HP 4275A LCR Meters
HP4332 HP 4332 LCR Meter
HP 4395A HP 4395A Combination Network, Spectrum, Impedance Analyzer includes audio frequencies
HP33120 15 MHz Function/Arbitrary Waveform Generator
HS2B4 Plantronics Supra -01NC 992C Headset
HS30A HS-30-A Headphones, CD-604 Transformer
HYX-65-1 Wire-line Adapter Local Unit & KY-65
KS-8455L2 Kick Test Set Line Loop Tester Telephone Installers & Repairman's Meter
KY68 KY-68 Secure Field Telephone
LS454 LS-454/U Loudspeaker
LS-685/U Crystal Loudspeaker
LS-688 PM Loudspeaker
M1024 Magnacord 1024 Reel to Reel Tape Recorder
M153 M-153/U Microphone, Voice Silencer
M80 M-80/U Handset (Microphone)
MAA Military Audio Accessories - tables with thumbnail photos & links to more info.
MATEL 2C800 Field Phone by Racal Acoustics Ltd.
MK-356/G Wire Splicing Kit
MRC67 MRC-67A Amplifier-Speaker
Music & audio amps
No6 - No. 6 Dry Cell
Noisecom 7110-FAC Programmable Noise Generator
NSLB Model NS-LB Noise Generator
Panasonic KX-TA824 Telephone System
PatchP Audio Patch Panel
Racal MATEL 2C800 Field Phone
RS 38-A Carbon Microphone
RT1185 RT-1185/GRA-114 Sound Observer Receiver Transmitter
SB-22A Analog Switchboard
SB-4170 Digital Switchboard
SB-3614A(V)/TT Telephone Switchboard
SG-886A/UR Interference (Noise & Tone) Generator
SidekickTandN Tempo Sidekick T&N Telephone Line Tester
Sound Powered Phones & Various Loudspeakers
Spying on Cell (Mobil) Phones
Subscriber Loop Analyzers
TA-1 Sound Powered Telephone Set
TA-1042 Digital Non-Secure Voice Terminal (DNVT)
TA-312/PT Telephone Set (Field Phone)
TA-838/TT Telephone Set
Teledyne Avionics TA-3D Acoustic Impedance Meter - ear canal impedance
Telegraph Telegraph Equipment, Stock Ticker, District Telegraph, Teletype, Keys, Relays, Sounders, Veedre Counter, Early Connectors, Electro-magnets
Telephone Patents & photos
Telephone Tool Kit
Telephone Poles - Utility, Power, Cable TV Poles
Tempo Sidekick T&N Line Tester
TF2700 Marconi TF-2700 Universal Bridge
TG-5-B Telegraph Set
Tone & Probe station wire testing
TS-2839/GY German H-33 Audio Test Set
TS-3647/G, Control Orderwire Unit (COU), Telephone Test Set
TS585 TS-585 Audio Level Meter
TSD-3600 Telephone Security Device
TSEC/KY-68 Digital Subscriber Voice Terminal
U229AA U-229 Audio Accessories
U229PO U-229 Pin Out by Function
U229Y "Y" Cable, U-229/U
UIQ10 UIQ-10 Public Address Set
VIC VIC Vehicle Inter Communication & VRC-12 Series Radios
Voice Over Internet Protocol (VOIP) Phone Service
Western Electric 202 Dial phone- consists of a phone and a "sub set" that's mounted on the wall.
WE 500 Dial Phone -
Western Electric 2554 Wall Touch Tone Telephone
WTFME1 Funkanpaßgerät WT-FM-E1 AP01 Telefunken Military wire to radio interface
Xtal1800 Crystal Radio 1800? & Brooke Clarke #1 & horn speaker
ZM-4B/U Resistance Bridge
Zo Transmission Line Zo vs. Frequency - down to audio
D - 104 Microphone wiring information, mods and circuits.
Add the Astatic D-104 Microphone to the Icom IC-706MKII By W8CWE - uses DC power from 706 to power D-104 amp.
My D-104 Preamplifier - Tone Control By: Alan Wolke, W2AEW (YouTube) - fits in base of D-104 and has Bass & Treble controls
http://www.rbmicro.com/index.php - replacement mike element
Back to Brooke's: PRC68, alphanumeric index of web pages, Products for Sale, Military Audio Connectors, Mil Audio with Photos, U-229 Pin Out, Connectors