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.

Input to vibrator 2 2a. Please communicate in english. Paraset in norway. 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.

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. The power supply delivers 6 vac and 350vdc. 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. One of my ham radio buddies calls this the paraset mini cooper.

Vii also has a 6 vdc power supply included with it which connected to a car battery via large alligator type clips. Power supply for mk vii. Paraset schematic from radio communication 1982 pdf on5lj s drawings. With a test of the 12a6 the output was about 2 2w 40ma at battery current of 1 5a.

This forum is all about building and using world war ii spy radio equipment in particular the whaddon mk vii paraset. The switch is the 80 40 meter bandswitch. With a 12v6 the output was nearly 4 5w 50ma and 1 8a from battery. There is also a nice all brass key connected to the rig out of the photo to the left.

The paraset would have been our ideal radio. Picture of the norweigean oluf reed olsen s set. And with a main power supply. I made a power supply for my portable tube radio emerson model 850.

I tested the power with a breadboard transmitter with nearly the same circuit as the paraset. Orange by musmus http musmus main jp. Consisting of transformer rectifier tube 6x5gt and a capacitor. The power supply is also tested september 15 1953 the power supply is very simple.

Drawing from on5lj. 12v 24ah battery is used. The only real issue i had with these circuits was the linear regulator would not start with all three tubes. This 6l6 puts out about 7 8w with 58ma anode current.

The transmitter has the paraset style parallel series tuned tank circuit and seems to load well even with a random length wire antenna. 4a jpg hd 7a jpg hd 8a jpg hd the power supply is very compact in a great box. 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. It has no screenprint.

Some differences were made during the war. It has 2 of the 12ba6 tubes for the regen radio and 2 of 12aq5 s for the little cw transmitter. Probably an early version. Blueprints from on6wj jos warnier.