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Thz man! I'm searching what is AST and I also have ast A10 amp. You help me a lot.

Well done stick to your guns only you need to be happy, no compromises unless you so desire. Thanks for sharing.

Excelente videos. Mirè los 5 y estan muy buenos. Hace muy poco, comprè un 5650 y tiene un sonido muy bueno. En los costados tiene una madera con vinilo que no me gusta y quiero preguntarte, que madera usaste? Se vè muy linda y el color tambièn.Muchas gracias...

Interesting your comments about replacing all the transistors, I have a Toshiba SC330 amp kind of on the bench, having fun finding suitable transistors, one of the channels input stage - long tailed pair was starting to 'go', it would cause the amps output to spike up to the full supply rail, took out my test speaker, which surprised me as the spikes were quite narrow. So yes, old transistors are a problem.

I find it surprising that it has a noticeable noise floor. I restored a few of the Sony V-FETS (about5-6 TA-5650, 2 TA-4650, a TA-8650 and a TA-F7), nowhere near your level (apart from killer diodes, recap and the usual for these I tend to leave semiconductors alone), and the only one that I found was noisy (hiss) was the TA-8650 (from a noisy pre-amp section, but it is likely because it uses very early ICs). The only thing that I noticed was that the TA-5650 and 4650 tend to buzz a lot if you use noisy inputs (desktop computers, mobile phones) because they are very sensitive to EMI. Not sure whether the noise floor you describe is a hiss or a buzzing noise, but maybe worth checking whether it has something to do with EMI.

Just love the transformer(s)/headphones idea. Brilliant!

Thanks man. Handsome unit there.

I own several of the VFET family, in fact one of the 4650 since brand new. The 4650 has always been the sweetspot of the range. I own a bunch of vintage items from Sony’s golden era. If you ever run across a TA-2244 or a more widely available TAE-86 or TAE-88 you will find preamps that rival modern preamps after some minor restoration.

If you want to do a full resto, it's no one's business to question as to why. I've followed all 5 parts and great outcome. Looking forward to future projects.

Been waiting on this video!! Parts list!! Thanks.

Yeah but here’s the fact. More components in line with the inputs, added electronic distortion. Pretty but a complete failure. $2.37 tops and that includes shipping.

By any chance you have the part number of the rectifier replaced? And the heat sink used on those 2 transistors on driver board? Nice video, very informative. Thx.

Hi what are the new tubes you put as a replacement? And why did you replace them?

I can make my own electrostatic headphones. But what I can't do is the amplifier. I am not an electronics person. That hindered my passion.

You are a modest genius!

Hi .Iam a subscriber of your channel . Your video is amazing. I have a same cd player but the previous version. The cd is not spinning. Pick up is new .it spins sometime but no TOC in display. Eject ,play ,stop and pause micro switches do only the eject function . Any set up to ne done with transport mechanismAny advise could be appreciated.Thanks

Like you I have collected a bunch of amplifiers, all from Yamaha including a P2200, PC2002m, M50 and a MX-1. Can't get myself to get rid of any of them.😄

Do you work on these for customers?

Great idea for the speaker terminals but I have to admit I'am not a fan of the deviders.

I had one of these. Bought it brand new in 1983. It is part of a stack, with the record player on the bottom, amp, radio and tape deck units on top, with everything playing through the amp where the speakers attached. Was a fantastic unit

Excellent work. The silicone pads are so much better for thermal than mica wafers and heat sink grease for the V-FETs.

except bare boards and cabinets everything got changed. 🤔

Please give me some circuit diagrams.

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noob question but why would he change out good components ? particularly the resistors ?

Great idea to include 3D Printing into the project.Shows your expertise in many fields.Out of curiosity -What printer did you use?Thanks in advance.

Thanks; what is the solution that you use in the ultrasonic cleaning machine?

Love your perfectionist approach.2 questions - What's the make of the green soldering iron you're are using so skilfully?As well you've mentioned pairing/coupling of transistors.How would you pair NPN/PNP output ones in a Class 'A' power amplifier[Krell for example].Many thanks in advance.

These things were big, ugly, stinky, dusty, and I don't miss my massive Sony receiver.

Nice clean job.What's the brand of the suction pump you are using.Looks very effective.

Fantastic work. Greetings from Brazil.

Hello! Could you please share a link to the service bulletin you are referring to in the video? The one that I found doesn't have the info about the necessary resistors' parameters for replacement. I believe they are different for each grade of V-FETs? That's why I would really appreciate you sharing the link! I'm starting restoration of my 4650 and will follow your videos thoroughly. Keep it up and good luck!

Beautiful restoration, the amplifier is stunning indeed. Better than new. I think you could definitely cut way down on the time lapse. I'd much rather see and hear your thoughts on why you are doing what you are doing. Other than that, I loved the entire series on this amp, well done.

Impressive work. Can you please share the name of the glue remover you use?

Those time lapses are not doing justice to the work. I understand the reasoning behind wanting shorter videos, but I don't mind long good ones. Perhaps showing important details for each section in real time? Or including chapter marks so people can jump these sections if they are bored with details? Anyway, it was my first time watching your work and I need to offer my compliments to a job well done.

Absolutely gorgeous restoration

Great job!

Hello, i'm also trying to convert my srd7 to be able to drive pro bias stax headphones so could you please make a tutorial or tips as to how you've done it, thanks!

I OWENED ONE OF THESE!!!

Still got one, from 40 years ago!

So disappointed ...not found any sound demo in the end🫤😟🙁☹️🥺🥹

Wow! A Brit w/ a toothbrush. I didn't think that had those in Jolly ol' England.

I love your work ethic and attention to detail. Absolutely gorgeous restoration. I could easily watch an hour of your videos (and I'm sure I'm not alone in saying such) so don't shorten too much. Thanks again for another super cool video.

XrayTony would be proud, good job. Just subscribed 😊

Really well done! I enjoyed this video, including the sped up bits. (I also appreciate the cleanliness of your bench and work in general.)

I have quite a few of the VFET Sony power and integrated amps. The 4650 is the best sounding in the family.

Absolutely beautiful job. Sometimes ocd is a good thing.

Certainly is stunning. You’re setting the bar very high!

I bought one of these amplifiers brand new back in late 1978 for $600AUD if my memory serves me correctly. A friend of mine in the day had the TA8650, much bigger amplifier power wise and it sounded great on a pair of La Scarla Klipsch loudspeakers.

When you speed up the video so much it's not possible to see what you are doing so it gets to be just a blur, I had to skip those bits to get to the commentary because it's kind of annoying trying to figure out what's happening. Having said that I do realise there are people who will run the video at slow speed so they can see as much detail as possible and would prefer to watch a 2 hour video of desoldering, installing and resoldering components !