- Видео 350
- Просмотров 159 848
Gerry O'Hara
Канада
Добавлен 26 сен 2015
Hi, I am Gerry O’Hara and have been interested in radio since I was around 14, becoming a licensed radio amateur in 1972. I received training in the radio and audio repair trade in an old-fashioned radio and TV store back in the UK while still at school (weekend/vacation job) and during vacations while at university, though went on to become a geologist, hydrogeologist and then environmental engineer. My family and I moved from the UK to Canada in 1997. My current main interests are restoring domestic radios of the 1920’s through 1940’s and communications receivers through to the early-1970's, though I will tackle just about any radio or amplifier with tubes in it, as well as writing articles on radio restoration topics. I retired as a Senior Principal (engineer) with an international consulting company in 2017, making a little more time for radios at last!
Checking Out a New Microphone for my iPhone
Following comments about the audio quality on some of the videos posted here, Santa brought me a new wireless microphone - this video is an impromptu test to see if it is an improvement (or not!). At least it allows me to walk around away from the iPhone...
Просмотров: 58
Видео
TMC GPR 90 Receiver - Initial Testing on Arrival
Просмотров 405День назад
The Technical Materials Corporation GPR-90 receiver will be one of my refurbishment projects in the New Year (2025). The owner noted that he had powered it up and that it was (sort of) working, bt he would like it working properly. The set is in good cosmetic condition and does function, but the band change and other switches have tarnished contacts that make operation intermittent and some con...
Siemens E-310 Marine Receiver Demo After Fitting Cabinet
Просмотров 19814 дней назад
This short video provides a brief demo of a Siemens E-310 marine receiver working after refurbishing the chassis and re-fitting into its cabinet for final soak testing prior to returning it to its owner. The final issue to fix prior to this was an intermittent band switching issue - finally resolved with additional cleaning of solidified grease, re-lubing and tightening a loose screw in the mec...
Demo of Tuning Eye Operation in a Siemens E-310 Marine Receiver
Просмотров 1 тыс.21 день назад
The EM-310 receiver is fitted with an EM-34 tuning 'eye' tube. The EM-34 fitted to this set was long past its 'useability date'. I had depleted my stock of EM34's long ago, and folks want 'silly money' for them these days, even dim ones, and NOS ones can cost well over $100. The set's owner had ordered two 6E5 eye tubes for his own stock, , so I decided to make an adapter that would allow a 6E5...
Demo of Interpolation Tuning System on a Siemens E-310 Receiver
Просмотров 42521 день назад
My earlier video on this recently refurbished receiver provided an overview of its controls, however, it did not demonstrate how the frequency interpolator system works. There is an example of this described in the receiver manual, so I thought it would be interesting to simply work through this on a short follow-up video - this is that video. The interpolator system is only functional on Band ...
Demo of a Siemens E-310 Marine Receiver after Refurbishing
Просмотров 3,4 тыс.21 день назад
This video provides a brief demo of a Siemens E-310 'rainbow' marine communications receiver , c.1960. Refurbishing work included recapping, replacing over 40 resistors, replacing selenium rectifiers with silicon parts, replacing three tubes (the EM34 eye tube has yet to be replaced), cleaning switches and controls, removing the front panel and knobs for cleaning, repairing the slow motion driv...
Siemens E310 Receiver - First Switch on After Arrival
Просмотров 3,6 тыс.Месяц назад
This Siemens E310 (aka 'Rainbow') receiver belongs to a friend. He noted that he thought it was working, but in need of some 'TLC' to make it reliable and performing as it should. This video records the first switch-on after arriving on the bench and removing some dust and spider webs... I will be giving the chassis a clean-up, followed by recapping, checking resistors, checking tubes and clean...
RCA AR-88 Receiver With Panadapter after Readjusting Crystal Filter
Просмотров 897Месяц назад
While using the refurbished AR-88 over the last couple of days, I was not 100% happy with the bandwidth on selectivity position ‘3’ - aligning this per the manual had resulted in the bandwidth being too narrow (1.233KHz at -6dB) for comfortable AM reception and even for SSB. So, I decided to hook-up the spectrum analyzer again and aim for a more appropriate bandwidth. This resulted in a much be...
RCA AR-88 on Soak Test
Просмотров 502Месяц назад
This newly-refurbished RCA AR-88 receiver is now on soak test for a few days. The refurbishment work included recapping, replacing several resistors and a full IF/RF alignment. This video includes some observations made during the first few hours of use.
RCA AR-88 Receiver and Panadapter After Receiver Alignment
Просмотров 6202 месяца назад
This RCA AR-88 receiver has been refurbished and a full IF and RF alignment completed. The IF stages were 'stagger tuned' using a spectrum analyzer with tracking generator to obtain optimal IF response curves. The video shows a panadapter being used with the AR-88 (a BNC jack has been installed on the rear apron of the receiver to output the IF signal prior to the IF stages of the receiver),
Initial Demo of RCA AR-88 Receiver Working with a BC-1031-C Panadapter
Просмотров 6462 месяца назад
This (AR-88 chassis has been slightly modded (easily reversible) to provide an IF output from the mixer tube plate to a BNC socket installed through an existing hole on the rear apron. This is connected to the input of a US Army BC-1031-C panadapter to check the units work ok together. I still have more refurbishment work to do on the AR-88, including checking resistor values and alignment chec...
RCA AR-88 Initial Check-out After Recapping
Просмотров 3792 месяца назад
The RCA AR-88 holds a special place in my heart - it was the first short wave radio I ever used - must be around 55 years ago(!). They are a great receiver - a really classis design (but they are so heavy!) I have refurbished (and fully restored) several models in the 'AR-88 family' since then, including an AR-88LF I owned and used almost every day for over a decade. The example in this video b...
Final Demo of the Howard Receiver and Panadapter Unit - Working Well!
Просмотров 2872 месяца назад
I found another fault in the panadapter while I was testing it - this time an intermittent silver mica capacitor in the AGC line (the 'C' version of this unit has a simple AGC circuit that operates on the IF amplifier tube only). There are two silver mica capacitor on this line, so I replaced them both. That improved the display when handling very strong signals. I also realized that the Howard...
Demo of BC-1031-C Panadapter After Recap and Alignment
Просмотров 3772 месяца назад
I was not happy with the performance of the panadapter after alignment , and suspected some of the paper-in-oil 'bathtub' style capacitors were (electrically) leaky. I tested a few out of circuit, and sure enough, they were (up to 8uA noted). I decided to change them all out for new poly film capacitors. I also checked the electrolytics and the two EHT capacitors and these all tested very good,...
US Army Panadapter - Demo After Alignment
Просмотров 2112 месяца назад
US Army Panadapter - Demo After Alignment
US Army Panadapter - Demo Using Sweep Generator
Просмотров 4492 месяца назад
US Army Panadapter - Demo Using Sweep Generator
Second Demo of the US Army Panadapter Model BC-1031-C
Просмотров 1502 месяца назад
Second Demo of the US Army Panadapter Model BC-1031-C
US Army Panadapter Model BC-1031-C Initial Test With a Howard 450A Receiver
Просмотров 5282 месяца назад
US Army Panadapter Model BC-1031-C Initial Test With a Howard 450A Receiver
Grundig Radio Chassis - Deep Bass Control
Просмотров 1333 месяца назад
Grundig Radio Chassis - Deep Bass Control
Demo of Atwater Kent Model 33 - Chassis back in the Cabinet
Просмотров 2263 месяца назад
Demo of Atwater Kent Model 33 - Chassis back in the Cabinet
Using an Atwater Kent Model 33 With 'Phones
Просмотров 3563 месяца назад
Using an Atwater Kent Model 33 With 'Phones
Initial Power-On of Atwater Kent Model 33
Просмотров 2593 месяца назад
Initial Power-On of Atwater Kent Model 33
Demo of 1959 Grundig Console chassis After Refurbishment and Alignment
Просмотров 1,2 тыс.3 месяца назад
Demo of 1959 Grundig Console chassis After Refurbishment and Alignment
Grundig Console Chassis Demo after Recapping
Просмотров 3743 месяца назад
Grundig Console Chassis Demo after Recapping
Collins KWS-1: Comparison of Collins 302C-1 Directional Watt Meter and B&W Watt Meter/Dummy Load
Просмотров 1514 месяца назад
Collins KWS-1: Comparison of Collins 302C-1 Directional Watt Meter and B&W Watt Meter/Dummy Load
Collins KWS 1 Power Output and Mod Tests 2
Просмотров 3844 месяца назад
Collins KWS 1 Power Output and Mod Tests 2
Initial Power-up Test of the Collins KWS-1 transmitter with PA Stage Operating
Просмотров 1154 месяца назад
Initial Power-up Test of the Collins KWS-1 transmitter with PA Stage Operating