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... 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... 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".... 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... read more >>

Restoration of the Dresner SW converterRestoration of the Dresner SW converter
Introduction I 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... read more >>

Restoration of the Breting 40 ReceiverRestoration of the Breting 40 Receiver
Introduction This 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... read more >>

RCA Q36 ReceiverRCA Q36 Receiver
Introduction This 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: 1947/1948 Type: Broadcast Receiver Valves/Tubes 11: 6SG7 6SA7 6SA7 6SK7 6U5 or 6G5 6SQ7 6R7 6SK7 6F6G... read more >>

Restoration Of the Standardyne 1928 AC Model ReceiverRestoration Of the Standardyne 1928 AC Model Receiver
Introduction It 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... 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 have done. I made the diagram directly from... read more >>

738 Silver Marshall Shortwave Converter Restoration738 Silver Marshall Shortwave Converter Restoration
Motivation: Some time, in the beginning of September 2006, I gave a friend of mine two EL86 tubes in exchange for a beautiful National type E dial. I did some research on the internet and found that the E dial was used in the SW-2. The idea of making a replica of the SW-2 began to attract me very... read more >>

Crosley 51 Regenerative ReceiverCrosley 51 Regenerative Receiver
Introduction: Crosley is a Radio Company that always amazed me for its creativity, functionality and economy. Its "Book Condenser" and its series tuned antenna input circuit are unique. The regeneration control by means of flat front-back moving coil is simple and very effective. Some time in November 2019 my son Edgardo bought for me a Crosley 51 and this... read more >>

A Tunable Loop AntennaA Tunable Loop Antenna
Introduction All TRF receivers, especially those from the 20s need a good long wire aerial and a good ground pole. At the present time those two requirements are difficult for me to meet. So I decided to try a LOOP ANTENNA with a tuning system. Construction of the Antenna The antenna was made by my friend and... read more >>

Reception Radio Corporation 5-Tube TRF Receiver RestorationReception Radio Corporation 5-Tube TRF Receiver Restoration
Introduction Some time in November of 2019 I bought this radio from a respected Ebay seller ip500. I was motivated to buy it because of its beautiful blue coils, and the fact that it had three individually tuned circuits. Description This is a TRF receiver with three tuned circuits: The antenna amplifier, the... read more >>

Stewart Radio Corp. Style 320Stewart Radio Corp. Style 320
Introduction

I bought this radio in January 2021. It called my attention the excellent condition of the radio and the fact that it was a Three Tube Radio. From the pictures I spotted a dark cylinder that I could not figure out. I asked the seller and he did not know either. I thought it was a Stewart... read more >>

Crosley TrirdynCrosley Trirdyn
Introductory Description

I bought the radio in December 2021 mainly because I wanted to experiment with a Reflex receiver. The Crosley Trirdyn is a Reflex-regenerative receiver. This radio uses three 01-A tubes. The first one is both, RF and 1st. Audio Amplifier. The second one is the regenerative detector, and the 3rd one - the audio output amplifier.... read more >>

Atwater Kent model 40Atwater Kent model 40
Introduction

I bought this radio from an eBay seller, at a good price, in the middle of 2015. It called my attention its "Coffin" type, heavy metal case, and the fact that the radio looked intact, clean, and with all of its original tubes in place. The radio had a rough trip from USA to El Salvador, as... read more >>

National HRO-60National HRO-60
Introduction

I obtained this radio back in 2003 from my friend José Antonio Guevara, YS1JW. I gave him a pair of Hi Fidelity speakers in an enclosure made and designed by our mutual friend Ing. Ernesto Chan Peña, YS4EP. He gave me the HRO-60 in a non working condition and with only one set of plug in coils... read more >>