Paraset Radio Power Supply

I started with the power supply and voltage divider lower left of the photo i wanted to test the linear regulator for the 6 3v filaments as well.

Paraset radio power supply.

Background i first heard of a paraset when i saw a message on the qrp l reflector announcing an upcoming june 6th paraset d day activity. Picture of the norweigean oluf reed olsen s set. 4a jpg hd 7a jpg hd 8a jpg hd the power supply is very compact in a great box. A search for more information soon revealed that the paraset was a small vacuum tube transmitter receiver unit built during wwii in the uk at the whaddon hall headquarters of the secret intelligence service communications unit.

This 6l6 puts out about 7 8w with 58ma anode current. Some differences were made during the war. Consisting of transformer rectifier tube 6x5gt and a capacitor. The paraset would have been our ideal radio.

For other radios separate forums can be set up ask the quartermaster. I made a power supply for my portable tube radio emerson model 850. It has 2 of the 12ba6 tubes for the regen radio and 2 of 12aq5 s for the little cw transmitter. One of my ham radio buddies calls this the paraset mini cooper.

The transmitter has the paraset style parallel series tuned tank circuit and seems to load well even with a random length wire antenna. The method to wiring this radio was done in stages. The power supply is also tested september 15 1953 the power supply is very simple. Paraset schematic from radio communication 1982 pdf on5lj s drawings.

What organization used this radio in 1953. Orange by musmus http musmus main jp. The switch is the 80 40 meter bandswitch. The power supply delivers 6 vac and 350vdc.

Input to vibrator 2 2a. It has no screenprint. I tested the power with a breadboard transmitter with nearly the same circuit as the paraset. With a test of the 12a6 the output was about 2 2w 40ma at battery current of 1 5a.

Drawing from on5lj. Vii also has a 6 vdc power supply included with it which connected to a car battery via large alligator type clips. Paraset in norway. Since it s small qrp power and size and operates on two of the current ham bands it seemed ideal for my glow bug project.

Power supply for mk vii. Probably an early version. The only real issue i had with these circuits was the linear regulator would not start with all three tubes. The paraset is described in some detail in a book secret warfare adapted by david kahn who translated it from the original french book written by pierre lorrain.

With a 12v6 the output was nearly 4 5w 50ma and 1 8a from battery. 12v 24ah battery is used. Blueprints from on6wj jos warnier. There is also a nice all brass key connected to the rig out of the photo to the left.