Видео 26
Просмотров 56 878

2:58

Microvitec CUB Monitor with a missing colour

5:05

Goldring Lenco GL75 Repair and Motor Drive Mechanism

1:13

Repairing a Rotel A14MKII. It was wired for 110v and connected to 230v!

7:24

Nikko TRM-50 Amplifier Repair

7:41

I took a look at a Bluetooth receiver board with a 5w + 5w amplifier

4:31

Repairing a Sansui AU-317 Amplifier

This old Sansui AU-317 amplifier was putting a popping sound on the speakers when the volume or bass was turned up.
www.orangevalleysystems.com/2024/12/04/sansui-au-317-amplifier-repairs/
This video shows how I repaired it.

Видео

2:58

Nissan 300ZX digital clock repairs

Просмотров 14728 дней назад

Three old digital clocks that weren't working came in for repair. www.orangevalleysystems.com/2024/11/22/nissan-300zx-digital-clock-repairs/ These are probably about 30 years old and use a VFD (vacuum fluorescent display) to display the time. These digital clocks are used in the old Nissan 300ZX sports cars. They weren't working due to some soldering at one end of the circuit board that had gon...

Microvitec CUB Monitor with a missing colour

5:05

Microvitec CUB Monitor with a missing colour

Просмотров 119Месяц назад

This old Microvitec CUB monitor needed repairing as the green was missing. This takes a look at the monitor, the scan coils and what the fault was and some of the applications it was used for in the past. www.orangevalleysystems.com/2024/11/04/microvitec-monitor-repair/ Monitors and TVs that use CRT screens have been consigned to the history books now as they've been replaced by LCD panels but ...

Goldring Lenco GL75 Repair and Motor Drive Mechanism

1:13

Goldring Lenco GL75 Repair and Motor Drive Mechanism

Просмотров 3052 месяца назад

This very short video shows how the motor in a Goldring Lenco GL75 drives the turntable. www.orangevalleysystems.com/2024/10/03/goldring-lenco-75-turntable-repair/ This turntable was in for repair as the phono cables were ancient and intermittent causing hum. This is a very short video as I forgot to make a few other clips of the turntable as I repaired it before returning it!

Repairing a Rotel A14MKII. It was wired for 110v and connected to 230v!

7:24

Repairing a Rotel A14MKII. It was wired for 110v and connected to 230v!

Просмотров 5482 месяца назад

This Rotel A14MK2 was wired for 110v and plugged into the UK 230v mains supply causing the amplifier to stop working! www.orangevalleysystems.com/2024/10/19/rotel-a14mkii-repairs/ Fortunately the front panel display and switches etc still worked so the over voltage damage was confined to the amplifier board that I was able to repair. This video takes a look at the electronics in the Rotel A14MK...

7:41

Nikko TRM-50 Amplifier Repair

Просмотров 3993 месяца назад

A vintage Nikko TRM-50 amplifier needed repairing so this video takes a look at the circuitry of this interesting amplifier from the 70s and what I did to get it working again. www.orangevalleysystems.com/2024/09/12/nikko-trm-50-amplifier-repair/ Information on the repair and my repair services are on my website at the above link. I repair old amps and turntables near Stroud in Gloucestershire.

I took a look at a Bluetooth receiver board with a 5w + 5w amplifier

4:31

I took a look at a Bluetooth receiver board with a 5w + 5w amplifier

Просмотров 734 месяца назад

There's lots of cheap Bluetooth receiver boards for next to nothing so I had a look at one as they're useful for converting old speakers etc to Bluetooth. This board costs less than a fiver in the UK and has two class D 5w amplifiers on it so it's plenty powerful enough for a lot of uses. It can be powered from a USB power supply.

5:24

Taking apart a Bush DAC 90A valve radio

Просмотров 2035 месяцев назад

I picked up an old Bush DAC 90A valve radio and took it apart to see what the electronics looked like along with seeing how easy it is to clean up the Bakelite cabinet and what might be involved in restoring one. More info on my website: www.orangevalleysystems.com/2024/07/29/is-it-worth-restoring-a-bush-dac90a-valve-radio/

I tested a cheap Chinese Phono Amplifier

6:07

I tested a cheap Chinese Phono Amplifier

Просмотров 3,2 тыс.9 месяцев назад

I keep seeing these cheap phono amplifiers on eBay and Aliexpress so brought one to see what was inside it and to see if it was any good. You'd need a phono amp if you wanted to connect a turntable to an amplifier that doesn't have a turntable input, which a lot of modern ones and home theatre amps don't have. Phono amp prices range from dirt cheap such as this one to ones costing many thousand...

A look at a Pioneer 615 Cassette Deck I had in for repair.

0:43

A look at a Pioneer 615 Cassette Deck I had in for repair.

Просмотров 699Год назад

I was asked to repair this old Pioneer 615 cassette deck. I thought it looked pretty cool with its VU meters (as does a lot of vintage hifi) so here's a short video of it playing a tape with the top off. One of the the great things about vintage hifi is it has interesting mechanical moving parts that modern audio misses out on. The audio in the video is recorded from the mic on my phone so isn'...

Thermionic Valves (tubes) Flash at Switch On

0:43

Thermionic Valves (tubes) Flash at Switch On

Просмотров 81Год назад

Some valves (tubes depending on where you live) in electronic equipment produce a big flash from the heaters when switched on from cold. I used to play about with old valve TV sets back in the 70's as I lived near a TV repair shop that gave me lots of their unwanted junk TVs and don't remember seeing this effect (I'd probably forgotten!) so I was surprised when some of the valves in an audio pr...

Repair of a Quad 34 Preamp - Picking up interference from a streamer

4:05

Repair of a Quad 34 Preamp - Picking up interference from a streamer

Просмотров 4,2 тыс.Год назад

This old Quad 34 preamp was picking up computer noises when it was connected to an audio streamer. The quad suffered from very bad earthing and a failed class X2 snubber network. There was also some burnt out tracks (traces) on the PCB that I repaired. This video shows how I improved the earthing to eliminate the interference along with the other fixes.

Repair of Hitachi HA-5300 amplifier that has distortion

3:20

Repair of Hitachi HA-5300 amplifier that has distortion

Просмотров 1,3 тыс.Год назад

A Hitachi HA-5300 amplifier came in for repair as it had distortion on the right channel. www.orangevalleysystems.com/electronics-repairs/ This video has a look around this old class E amplifier and covers how I repaired it. The video shows oscilloscope waveforms that show what amplifier crossover distortion looks like before and after it was repaired.

Repair of a Rotel RA-840b Amplifier with no sound.

2:26

Repair of a Rotel RA-840b Amplifier with no sound.

Просмотров 1,7 тыс.Год назад

The phono (turntable) and other inputs on this old Rotel amplifier weren't working. www.orangevalleysystems.com/electronics-repairs/ This video shows what the fault was and how it was repaired along with a look at the inside of the amplifier. I offer electronics repairs in Gloucestershire so if you need something repaired please contact me.

A look at an old Sansui BA-3000 Amplifier

1:20

A look at an old Sansui BA-3000 Amplifier

Просмотров 5 тыс.Год назад

An old Sansui BA-3000 power amplifier. This one had a failed VU meter that I was asked to investigate. www.orangevalleysystems.com/electronics-repairs/ This video takes a look at the inside of the amplifier. Even though it's got a huge heatsink it's NOT a class A amplifier, it's just got a lot of power transistors. There isn't a lot of electronics in it as it's just a stereo power amplifier, al...