Replacing A Tuning Indicator Tube (EM 85) With An EM 80 By Bill Werzner A few weeks ago I finished restoring a Grundig model 7085 AM FM stereo console that was manufactured in 1956/57. This radio required a good cleaning inside following my air compressor blasting away the heavy build up of dust. The switches Read more about Replacing A Tuning Indicator Tube (EM 85) With An EM 80[…]
Converting a Philco Dial Lamp Assembly to an LED By Bill Werzner If you have ever been confronted with a deteriorated vintage radio dial lamp assembly you will understand where I’m coming from. This dial lamp problem was one I had to address in order to complete my restoration of a Philco tombstone model 610. Read more about Converting a Philco Dial Lamp Assembly to an LED[…]
HVRA Membership The HVRA board has approved a new membership renewal process. Currently, we have membership renewals that occur every month depending on the date they joined HVRA. This is being changed to all members having a renewal date of January 31 each year. We need to do this because the effort required to manage the current process Read more about Important New Membership Dues Information[…]
2017 Christmas Party (J. Sirkin) HVRA held its annual Christmas Party on December 15th at the Hobby Airport Hilton Doubletree Hotel. Although the planned start time of 6:30 was delayed by Friday evening rush hour, Bill Werzner began his opening remarks to a group of 46 members, their families and guests just after 7PM. Bill Read more about 2017 Christmas Party Fun![…]
A Fishy Story…. By Steven Pena, HVRA Historian It was not without some small degree of disappointment that I heard the birds chirping that Saturday morning, announcing that, though it was still rather dark outside, it was already time to rise for our July club meeting. My wife reminded me that I was to take Read more about A Fishy Story…. By Steven Pena, HVRA Historia[…]
Understanding How a Tube Works by Tom Taylor In an effort to help our new members understand the action of a tube we would like to offer a mechanical perspective of its action. If we think of the VOLTAGE across a resistor increasing and decreasing in accordance with the CURRENT changes through it (using the Read more about Understanding How a Tube Works by Tom Taylor[…]
Understanding Negative Bias by Tom Taylor Let’s talk negative for a moment and for clarity the topic is about radios with power transformers. I for one hesitate once in a while when looking at a schematic while trying to sort out how and why a negative voltage is generated in the circuit. Take a look Read more about Understanding Negative Bias by Tom Taylor[…]
THE REFLEX RADIO by Ron Soyland Back in the 1920’s tubes were expensive, usually the most expensive part of a radio. So experimenters wondered if there was a way to make use of a single tube to amplify both the RF signal and then the AF signal, thus getting double use from the tube. This Read more about THE REFLEX RADIO by Ron Soyland[…]
Farm Set Antenna Coil Problem & 3 Coils in the Drawer by Bill Werzner Have you ever had one of those restoration projects that despite having changed out all the old defective and out of spec components, the radio reception still sounds “anemic” for better description? I had one of those on my bench a Read more about Farm Set Antenna Coil Problem & 3 Coils in the Drawer[…]
One of the least understood components found in radios is the common electrolytic capacitor. These capacitors work on a slightly different principle than a simple paper capacitor. When certain metals, such as aluminum, are immersed in an electrolyte (conductive solution) and current is applied, oxygen from the electrolyte oxidizes the surface of the metal forming Read more about UNDERSTANDING ELECTROLYTIC CAPACITORS by Ron Soyland[…]