The MIZUHO and NISHI MUSEN Reflector

and unofficial English language Mizuho enthusiasts site

Mizuho has made a matching amplifier for almost every model of MX series handheld issued to date. This is the PL series of amplifiers. The PL-2 amplifier matching the older 200mW MX-2 2m handheld put out five watts, while all other PL series models put out 10 watts.

Specifications (PL-xxS):

Final stage: 2SC1945 x 1
Final stage input power & voltage: 20W 13.8V
Modes: SSB CW
Output power: 10W
Input power: 2W (HF models), 1W (PL-6S)
In/out impedance: 50 Ohms
Semiconductors: 4 transistors, 1 IC, 9 diodes
Current drain: 2.5A maximum
Power source: 13.8V DC
External dimensions: 110W x 39H x 142D mm
Weight: 520 grams (about 1.2 lbs.)
Additional circuit: TX/RX LED monitoring 9.5VDC input

In additon, Mizuho briefly made a multiband (6-80M) amplifier for the ham who has several MX series handhelds. The PL-1000 is extremely rare and sought after. It requires 2W input on 80,40,20,15, or 10 meters, and 1W on 6 meters for a rated 10W output. Actual output power as high as 18W has been measured on some bands. The amp does not work with the older 200-300mW handhelds, which provide insufficient drive power. It also does not work with the MX-18S 17 meter handheld.

Specifications (PL-1000):

Frequency: 3.5 - 50MHz
Final stages: 2SC1947 x 1, 2SC1945 x 2
Final stage input power & voltage: 20W 13.8V
Modes: SSB CW
Output power: 10W
Input power: 2W (HF), 1W (VHF)
In/out impedance: 50 Ohms
Semiconductors: 5 transistors, 2 ICs, 8 diodes, 2 LEDs
Current drain: 2.5A maximum
Power source: 13.8V DC
External dimensions: 110W x 40H x 190D mm
Weight: 750g

The LA series of amplifiers matched older (1970s and early 1980s) Mizuho gear. At left is the LA-2X, the matching 10W amplifier for Mizuho's SB-2X 2m SSB/CW 1W portable transceiver. More information, specifications, and manuals on LA series amplifiers will be posted shortly.