Stewart-Warner 301-A shortwave converter restorationStewart-Warner 301-A shortwave converter restoration
Having restored a 738 Silver Marshall Short Wave Converter from ground up, and after enjoying shortwave listening with it, I decided to venture into the world of the shortwave converters.Some time, in October of 2007, I bought a Stewart-Warner 301-A shortwave converter that looked like the perfect subject for restoration. The converter looked like shown in photos: (Click images to... read more >>

Restoration of the Stewart-Warner R-113 Shortwave ConverterRestoration of the Stewart-Warner R-113 Shortwave Converter
Between 1931 and 1934 Stewart-Warner made at least four models of shortwave converters. All of which had the same basic design. The most important differences were:   a) The kind of tubes used.   b)The way the filaments were fed.   c) The kind of band switch used. The band switch used by the R-113 is by far superior to the one used by the 301-A, and... read more >>

KA-116 Short Wave Converter ReplicaKA-116 Short Wave Converter Replica
IntroductionIn late October 2009, while visiting short wave converter, I came across the description of the KA-116, russian made, short wave converter. The design of this converter intrigued me, and at the same time it remainded me of a USA made converter called "The Sumariner", which diagram and photo were published in the October 1931 issue of "Radio News". I... read more >>

Stewart-Warner 345 radio restorationStewart-Warner 345 radio restoration
Stewart Warner model 345 battery operated receiver, circa 1926. It would have been one of the later battery operated radios as most makers began producting AC radios in the late 1920's.The Stewart-Warner 345 is a TRF receiver using six 01-A tubes. The first stage is an untuned (aperiodic) RF Stage, coupling the antenna to the radio. The second and third... read more >>

Restoration of the Dresner SW converterRestoration of the Dresner SW converter
IntroductionI bought the Dresner SW Converter sometime in 2006 from an ebay seller. As the bidding process was going on I did some research, and found that the so called Dresner SW Converter was not a frequency converter. Instead it was a one tube SW Regenerative Radio Detector. This motivated me to buy it, and I bought it for a... read more >>

Restoration of the Breting 40 ReceiverRestoration of the Breting 40 Receiver
IntroductionThis interesting receiver was bought by a friend of mine, and while tracing its where about, it turned out to belong to a ham radio pioneer Eng. Miguel Angel Sol, YS1MS. In view of this I put a lot of time, effort and work to repair this radio to honor YS1MS and to provide my friend Mr. Salvador Galdamez, and... read more >>

RCA Q36 ReceiverRCA Q36 Receiver
IntroductionThis radio was a gift, given to me by my friend Dr. Fernando A. Melgar several years ago. When I received the radio it presented distorted audio, the magic eye did not work, but its shortwave reception was very good.Year: 1947/1948Type: Broadcast Receiver Valves/Tubes 11: 6SG7 6SA7 6SA7 6SK7 6U5 or 6G5 6SQ7 6R7 6SK7 6F6G 6F6G 5U4G Principle Superhet... read more >>

Restoration Of the Standardyne 1928 AC Model ReceiverRestoration Of the Standardyne 1928 AC Model Receiver
IntroductionIt seems to me that my model is an earlier version of the Model AC-29. My model comes with a complete diagram, but it does not show the values for the resistors and condensers of its power supply. There is also a difference in the volume control circuit. Otherwise it is almost identical to the Standardyne AC-29 model.The outstanding feature... read more >>

Babcock Preselector model P2A DXBabcock Preselector model P2A DX'er overview
Babcock P2A Preselector, Van Nuys, California, USA. Date: early 50s This preselector was given to me by my Mentor Dr. Manuel Cader in 1963. It has been in operation since 1963 until present times. I found no information on this preselector, so I want to share what I... read more >>