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Revo x b750 amplifier research

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Hi-Fi & Radio


David, aka Grumpy, needs our help. Great news. David is home! It was quite the ordeal to get him home and into the house, but it is done. Thank you to everyone for their support. Now a long road ahead to get him back on his feet and functioning normally. I have started a GoFundMe to help with the medical bills. Please help, if you can. Discussion in ' Solid State ' started by smurfer77 , May 28, Log in or Sign up.

Revox B integrated amplifier restoration Discussion in ' Solid State ' started by smurfer77 , May 28, Messages: 5.

So much good info. Thanks a lot. You don't sell four of your PCB's by any change? TLMadsen , Jul 8, Messages: 1, Location: San Francisco. Bias transistor cleaned up and remounted.

I cleaned the legs of all transistors. Many of them were filthy. So I also flushed the sockets with deoxit. However, I knew from previous power up and measurements including distortion that appear to be working just fine.

I've seen this before but not to this extent. I've decided to use silicon thermal pads. I will report back if I start having negative experiences with Si insulator pads And here, you can see the spacing between the main filter caps and the heat sinks. With 35mm caps installed one cap on each module was touching the heatsink but with the 30mm caps there is a gap, same as original installation. Here are the finished power amp boards, recapped, new VRs and all sockets and transistors cleaned and remounted.

Call me paranoid, but I checked the output transistor terminals for shorts to ground or each other after installation. Hyperion likes this. Before installing the power modes I checked the emitter resistor values, before I set bias.

They are meant to be 0. They all measured like this: Bias and offset will be set for one module, before other is installed. I setup the variac to V because that is typical wall voltage for me here. A bit of a tight squeeze with my new VRs. I roughly set bias and DC offset for this one channel just to get things in ball park and make sure everything seemed ok.

If doing this over again I would chose a different VR for the DC offset because it was too low profile the one I used With both power amp modules installed she pulls about 0. That's about. On some amps I need to wait this long, but on this amp it was really just abundance of caution Will check again in a couple of weeks. Glad I bought C rated power filter caps. The heat sinks warm the caps up to about 36 C but that's just at idle under load will be hotter Messages: 65, Location: Hertfordshire, UK.

Genius, absolute genius - what an excellent thread! Hyperion , Jul 8, Messages: 3, Location: Close to Alkmaar, Netherlands. The Rifa's at work are in some workshop where nothing rusts and I believe it is pretty dry over there.

Before I put them is the small bins just a few months ago they were still in a box with other stuff, still in a little plastic bag, which probably was openened just once or twice to take some out Who knows, maybe moisture resides in bad resin itself Moisture will play a role.

The transparent plastic cracks, you get ingress, boom. PE9ZZ , Jul 9, Continue to be outstanding work. A couple of small Q. Why did you not use Si-pads for the transistors ext?. Is 1W really needed? TLMadsen , Jul 9, I've skipped over one PCB, which I've saved for last The Protection board Tants are actually electrolytics just tantalum instead of Al and they are polar. Revox in this board made some non-polar caps by putting tants back-to-back. I replaced these two pairs of caps with single caps of appropriate value.

When you do this beware of not only how capacitance 'adds' in series, but how required voltage rating shifts too. For the speaker relays modern subs are available although not that easy to source. For the headphone relay though, I searched hard but there is no modern substitute.

Kits only sell you a NOS substitute part but even that is hard to get hold of now. I contacted the maker and they also claim there is no modern substitute.

Hyperion - we could probably use something like this for some of the hard to find relays on the sansui's My new adapter board and the original part: I've decided to take this even a step further and socket the relay, so this is now user replaceable in the future. There are a couple of versions of the sockets available; again I paid extra to get the best materials available. This might seem trivial but it started to add up And looking good installed back into the amp, and not meaning to make this thread political, but missionaccomplished although some testing and cosmetics will follow.

GyroTuner , GPS16 and gslikker like this. Messages: Location: Greece. Excellent work! Messages: 1, Location: Austin, TX. Nice job! Once you start working on Revox gear you simply do not want to work on anything else. PE9ZZ likes this. Messages: Location: Central California. Do you draw a circuit on the back of an envelope and mail it in? As a novice I sometimes think "this would be so much better if I love how you take what is given, ask the "what if" question and then find a solution.

That appeals to my OCD brain in many ways. Not only does it restore function, but it improves future functionality and repairability. Of course I want to run out and find this needle-in-a-haystack integrated amp just so I can see if I can duplicate your work. I used to complain that my kids didn't want to learn anything the old fashioned way--by apprenticing with dad as he dragged them through all the fixit stuff around the home and car.

They have a false sense of confidence from watching a youtube video on any subject, but I'm seeing quite literally that visual explanation is so critical to the process--and it is great to go back to the source and rewatch things. Greg Nal , Jul 22, Messages: Inspiring thread.

The motivation I need to tackle my B Al Casey , Oct 6, BR Thomas. TLMadsen , Oct 19, Al Casey , Oct 21, You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet. Your name or email address: Do you already have an account?


Electronic capacitor & trimmer overhaul for Revox PR99

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Revox B750 Mk2 Manual Lymphatic Drainage

revo x b750 amplifier research

Started by Gopher. Started by bunky. Started by Ubik. Started by zeke.

Well-priced and well-specced set of earbuds with impressive sound quality, but they suffer more wind noise than others.

Anyone using an integrated amp?


THD 0. Direct-coupled output Power bandwidth , Hz. Sensitivity: 1. Vacuum-tube design with solid-state power supply.

Revox B710 MK II Manual page 22

Back to the full list. Choosing the best mic preamp s for your applications can be a challenging task. Check it out for help choosing the best mic preamps for your applications. Choosing the best power amplifier for your car, home sound system, or pro audio application can be a complicated assignment. Check it out for help choosing the best power amp for your applications. He's an audio engineer by trade and works on contract in his home country of Canada. When not blogging on MNM, he's likely hiking outdoors and blogging at Hikers' Movement hikersmovement. Check out his Pond5 and AudioJungle accounts.

Unison Research - Unico Secondo - Hybrid integrated amplifier - Class A Unsold Revox - B77 4track & B MKII & B & Revox audio rack.

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Revox B780


Some things are cheap — such an attic find, brand Revox B — only at first sight, if you take a closer look it can get more expensive……. So with this device. I bought the really well-reputed integrated amplifier to complement the B tuner , the Revox B77 Tape machine and the B Tapedeck. Fortunately, I had myself Read well before buying , to what extent all parts were still available as spare parts.

After changing all of the capacitors and transistors, its sound is very impressive. First of all it is a current feedback amplifier.

Revox B 215 Service Manual

There are now two system of high fidelity, monophonic monaural and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

Electronics Consumer electronics Audio REVOX there are files in this category Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information. Full service history, original box and packing, manual, one owner from new. Possibly the finest example available right now. Condition: TOP condition, just minimal signs of usage!




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  1. Arber

    the very funny answer

  2. Sinclair

    It agrees, the message is very useful

  3. Teyrnon

    Now all is clear, I thank for the information.