Hi Vern, I'm glad it's you restoring this radio, I would have been lost, too many different design features. I guessed the 76 tube was using anode bend detection, wrong again. I haven't seen a radio with grid leak detection. I have a copy of the radiotron handbook, it was produced by AWA in Australia, a very good book. Great video, I learned a lot, thanks 👍🙂
Hi David, The difference between Grid Leak and Anode Bend are a fuzzy line to me. I had originally put in a section in the video showing the tube operating curve and how it is biased to "clip" and rectify. The video was getting so long I deleted it. I am just in the habit of calling this grid leak. Both use a non linear portion of the tube to rectify/detect. Trouble with a set like this is it relies on perfect bias in the I.F. and in the detector and as tubes and resistors age bias drifts and distortion sets in. But considering the age of this set it works pretty well. Thanks for watching.
What an enjoyable demonstration of human flaws, David dropped you in it but your patience and ability read a reference book (a written or printed work consisting of pages of information glued or sewn together along one side and bound in covers and not requiring batteries ) make the tutorial that much more enjoyable. I too could not see the circuit and my brain was making it too complex. Best to Vern. PC Can you run camera from USB power bank
That was interesting - and would have driven me bonkers, these "surprises" in the design. While I was watching and enjoying the video I realized what a shame it is that so much knowledge of these old - but often brilliant, considering the tech of the time - designs just fades away, is lost. Luckily we have "tubenators" like you, David, Carlson and some others that truly understand and are able to explain these designs and technologies. I am sometimes not able to follow all of it, but it is just really fascinating what they were able to achieve. Thank you for sharing it!
Superregeneration is a mystery to most but the radio you have is a practical ( cheaper) modification to work only as a regenerative receiver with elements of a TRF set and by putting dashed lines around the actual first IF it makes sense. Cool article finds as it help solves the mystery of a go between TRF and superhet technology. Great learning experience on a radio from 1934. Always appreciate your videos Vern.
I learnt a good deal and Vern answered some questions I should have asked fifty years ago. Nice the way Vern involves us in the process. Any one who refers to the Doobaly Doos (aka AVE) is obviously worth listening too. Best
50Hz creates more magnetic flux in the core, which increases core loss dramatically if the transformer was designed with the core near saturation at 60Hz.
As you say, sucks being me. 29:10 LOUD de de de duh duh phone notification. Heard it about ten times in the pub last night. Many times on a train to London on Tuesday. Drives me nuts. PLEASE, everyone reading this, just put your phone on vibrate! (Great video otherwise).
Hi Vern, I'm glad it's you restoring this radio, I would have been lost, too many different design features. I guessed the 76 tube was using anode bend detection, wrong again. I haven't seen a radio with grid leak detection. I have a copy of the radiotron handbook, it was produced by AWA in Australia, a very good book. Great video, I learned a lot, thanks 👍🙂
Hi David,
The difference between Grid Leak and Anode Bend are a fuzzy line to me. I had originally put in a section in the video showing the tube operating curve and how it is biased to "clip" and rectify. The video was getting so long I deleted it. I am just in the habit of calling this grid leak. Both use a non linear portion of the tube to rectify/detect. Trouble with a set like this is it relies on perfect bias in the I.F. and in the detector and as tubes and resistors age bias drifts and distortion sets in. But considering the age of this set it works pretty well. Thanks for watching.
Kaput Restauriert.😡
What an enjoyable demonstration of human flaws, David dropped you in it but your patience and ability read a reference book (a written or printed work consisting of pages of information glued or sewn together along one side and bound in covers and not requiring batteries ) make the tutorial that much more enjoyable. I too could not see the circuit and my brain was making it too complex. Best to Vern.
PC Can you run camera from USB power bank
Interresting radio layout indeed. Thanks for the video. Enjoyed it.
That was interesting - and would have driven me bonkers, these "surprises" in the design. While I was watching and enjoying the video I realized what a shame it is that so much knowledge of these old - but often brilliant, considering the tech of the time - designs just fades away, is lost. Luckily we have "tubenators" like you, David, Carlson and some others that truly understand and are able to explain these designs and technologies. I am sometimes not able to follow all of it, but it is just really fascinating what they were able to achieve. Thank you for sharing it!
Some of it baffles me as well. I dig out the books and try to make sense of it all. Thanks for watching. And for stopping by.
Superregeneration is a mystery to most but the radio you have is a practical ( cheaper) modification to work only as a regenerative receiver with elements of a TRF set and by putting dashed lines around the actual first IF it makes sense.
Cool article finds as it help solves the mystery of a go between TRF and superhet technology. Great learning experience
on a radio from 1934. Always appreciate your videos Vern.
Thanks Master, High Praise coming from you. 😀
I learnt a good deal and Vern answered some questions I should have asked fifty years ago. Nice the way Vern involves us in the process. Any one who refers to the Doobaly Doos (aka AVE) is obviously worth listening too. Best
You could use those yellow caps for paving!
I could be wrong, but is this an example of an "Autodyne" converter circuit?
I'd like to build your capacitor tester. Do you have a video on it? Or a schematic?
50Hz creates more magnetic flux in the core, which increases core loss dramatically if the transformer was designed with the core near saturation at 60Hz.
As you say, sucks being me. 29:10 LOUD de de de duh duh phone notification. Heard it about ten times in the pub last night. Many times on a train to London on Tuesday. Drives me nuts. PLEASE, everyone reading this, just put your phone on vibrate! (Great video otherwise).
Warum Befüllt man die alten Kondensatoren nicht oder Hängt sie einseitig ab und lässt sie im Radio. Das ist einfach nur kaput Restauriert. 🥵😡😡