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Amazing Sansui CA-F1 Preamplifier Repair and Restoration 

Liquid Audio
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29 окт 2024

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Комментарии : 48   
@papabear1417
@papabear1417 Год назад
I love these videos. An expert telling it as it is rather than opinion experts who don't know TF they're talking about.
@PrimeHiFi
@PrimeHiFi 3 года назад
Looks like the original black flag caps have been previously changed out for silver mica / film. That’s a very good thing. Those are the culprit of oscillation that killed many great “high speed” amplifiers from Kenwood like the L-07MII, as well as other amplifiers from Sansui. Nice restoration, looking forward to more videos! Cheers
@briangoldberg4439
@briangoldberg4439 3 года назад
Thanks for video! Sorry to hear about your father. Happy birthday to him.
@tee-jaythestereo-bargainph2120
@tee-jaythestereo-bargainph2120 3 года назад
Nice jon mate ! Love the channel !
@brunolagace1135
@brunolagace1135 3 года назад
Sorry to hear about father. Wish nothing but the best to your family.
@LiquidAudio
@LiquidAudio 3 года назад
Much appreciated, Bruno.
@bkatbamna
@bkatbamna 3 года назад
Sorry to hear about your father. Great job! Wow.
@gino3286
@gino3286 6 месяцев назад
hi congratulations for the impressive work indeed I have a question about the 9:19 regulation Could multiturn trimmers give a better regulation ? someone advise against those but to me for bias and off-set tuning are just perfect
@LiquidAudio
@LiquidAudio 6 месяцев назад
Multiturn trimmers are really only advantageous where adjustment precision calls for it and the circuit supports it, or where the trimmer value is high and provides relatively coarse adjustment making small adjustments difficult. In consumer gear like this, single-turn trimmers work well in most instances. Circuit stability in consumer gear is relatively poor (compared to lab gear for example) and drift often quickly nullifies any perceived advantage offered by a higher resolution adjustment. Sansui often used a coarse and fine single-turn trimmer arrangement in their amplifiers for example which works very well. People often misunderstand the topic of adjustment, precisely setting a DC null point for example that is by design unstable, only to have it drift by hundreds of mV due to the design! Sometimes trimmer value can be changed allowing for a higher precision adjustment over a smaller range, etc.
@gino3286
@gino3286 6 месяцев назад
@@LiquidAudio hi thank you very much for your extremely kind and valuable advice when i see the complexity of units like this one i am amazed and scared at the same time So many parts to check I have the feeling that in order to get top performance like in this case complexity is a necessity Simpler circuits have no hope to provide for instance these distortion figures ? Last question In your experience which has been the best line preamp you have had on your lab bench ? line preamps are my obessions Kind regards gino
@adriangilbert6139
@adriangilbert6139 3 года назад
Thanks for the video and would it be possible to show more details about the repair process such as the soldering and desoldering and even the cleaning?
@LiquidAudio
@LiquidAudio 3 года назад
Very reasonable request, I know everyone wants this. The big issue for me is that, being so busy with the business part of what I do, I cannot afford to spend much time on videos. I got a DJI phone gimbal for my birthday, so let's see if I can make my one camera method work better!
@cougar1861
@cougar1861 3 года назад
Would you be so kind as to tell the types of solvent(s), if any, used on the gunked-up rotary switches and for removing corrosive glue?
@rickclink9196
@rickclink9196 3 года назад
Nice video. What kind of chemicals do you use to clean the electronics? Maybe you could explain the process.
@LiquidAudio
@LiquidAudio 3 года назад
It's one of my most frequently asked questions!
@gmjwtech6976
@gmjwtech6976 2 года назад
Great work! How you would compare the audible capability with today`s gear?
@LiquidAudio
@LiquidAudio 2 года назад
Thank you, all analog preamps like this are very rare these days and sound amazing. Sonically these are just fantastic!
@geirendre
@geirendre 3 года назад
10:00 would be interesting to know what distortion it shows if you connect the Panasonic directly to the THD meter.
@johnfinn1570
@johnfinn1570 3 года назад
Greetings from melbourne. I like your attention to detail. Are the electrolytic caps from panasonic. i use the fm and fe series. Keep up the good work
@LiquidAudio
@LiquidAudio 3 года назад
Very kind of you John, I stock and use a range of capacitors including Panasonic, Nippon Chemi-Con, Nichicon, Kemet, Elna etc.
@HouseofRecordsTacoma
@HouseofRecordsTacoma 3 года назад
Fine piece of gear that deserved the overhaul, rather than some of your customers just wanting to get it up & running.
@LiquidAudio
@LiquidAudio 3 года назад
Absolutely agreed, thanks for commenting!
@senn6k
@senn6k 2 года назад
I am getting loud pop noice is speaker scared that it might get damage , this happens when u press the subsonic switch, tone defeat switch , output selecter switch changing to A or B , when you move the bass pot counter clockwise ( even in defeat or tone mode) either way.. treble control is fine. I also checked it has pop up noise prevention circuit but does not work.. read the forum for the black flag caps replacement.. planning to do along with electrolytic caps, the schematic diagram doesn't not have electrolytic caps in the list , that's why I needed your help
@LiquidAudio
@LiquidAudio 2 года назад
No problem. By far the most sensible approach for most is to take equipment like this to a specialist and have it repaired properly. That's my opinion as a specialist working on equipment like this every day, and someone who likes to see equipment like this preserved - liquidaudio.com.au/. Forums and a little bit of knowledge can be dangerous, so just be careful. The service manual does contain a list of all parts including capacitors. Just know that simply replacing parts will not resolve the issues you have there, and may not solve any!
@senn6k
@senn6k 2 года назад
@@LiquidAudio Thanks , am from Chennai and finding specialist is an issue , I myself an electronics engineer and after 30 years just started to do on my own for my amps, last month I did recap my Carver CM1090. and I agree just recap will not solve the all the issue. just a try from my end and will try to find specialist for in-depth servicing.. by the way the manual did not have the full list. Thanks for your quick reply , I appreciate it.
@LiquidAudio
@LiquidAudio 2 года назад
@Senthilkumar Nagabooshanam Excellent, I didn't see this reply, it helps that you are an engineer. I agree, finding good people to do this work is the biggest challenge and partly why I am so busy for example. I have a philosophical problem with the shotgun recap approach and the general 'echo-chamber' around black flag caps for example. That being said, if you take a holistic view and test parts rather than blindly replacing them, that's a great start.
@senn6k
@senn6k 2 года назад
​@@LiquidAudio thanks a lot for your time and I had managed to get the caps list myself ,after continuous effort googling and zooming the shematic's (20mins it did helped. now am a Cloud IT professional for 25years , turning back the clock to 90's where I used to assemble amps and Tv's that knowledge is helping now.
@LiquidAudio
@LiquidAudio 2 года назад
My pleasure, happy to chat.
@zerotoxico
@zerotoxico 2 года назад
What are your thoughts on nichicon electrolytic capacitors and audio note capacitors? Whitch would you prefere personoly?
@LiquidAudio
@LiquidAudio 2 года назад
Hi, different sorts of capacitors for different markets and with hugely different costs in most cases. Nichicon focuses on electrolytic caps, AudioNote focuses on low C film caps, so they can't really be compared when looking at what to use in normal consumer gear.
@zerotoxico
@zerotoxico 2 года назад
@@LiquidAudio Thank you for the awnser im sorry but i am not really shure i understand when you say "low c film caps" could you pleas explain this? And just to expand on my cuestion a bit more if you dont mind :) I was thinking mabey of replaceing some caps in my preamp and/or mabey my dac in the output stages and i wonder what brands should use to get a superior sound quality? I understand if this is diffurcult to awnser. Best regards David.
@LiquidAudio
@LiquidAudio 2 года назад
@@zerotoxico No problem, can't get into too much detail in youtube comments but C refers to capacitance and film cap is a type of capacitor. These companies make different sorts of capacitors. To know what parts to use, you really need to understand the role they play in the circuit. Unless you have a good grasp of the engineering aspects of parts selection, it's best to leave that to someone with the knowledge needed to make the appropriate changes and improvements.
@zerotoxico
@zerotoxico 2 года назад
@@LiquidAudio Ok that makes more sense now! I am mearly a audiophile trying to learn more about the desingns and im handy around tools so im thinking about doing some easy soldering to start with like changing a potmeter ore trying to clean it more thurogh in my vintage preamp and mabey changeing out some soldering point to AudioNote Solder anyway. Thank you for the reply and please keep up making great video content im learing setp buy step and its grear fun watching 👍
@piwex69
@piwex69 3 года назад
Wow TM500 bench!
@LiquidAudio
@LiquidAudio 3 года назад
You've gotta love the TM500 series!!
@senn6k
@senn6k 2 года назад
is there anyway to get the caps list in excel or pdf
@LiquidAudio
@LiquidAudio 2 года назад
Not from me, plus I don't use parts lists or BOMs anyway. There is a service manual though.
@senn6k
@senn6k 2 года назад
@@LiquidAudio the service manual doesn't have EC list. It has everything apart from Electrolytic caps , I can see only 1000mf 63 v. listed . it says some of the caps and parts omitted in this service manual , and asking to look out common parts list appended to service manual
@LiquidAudio
@LiquidAudio 2 года назад
@@senn6k Correct and my apologies, I saw a couple of ECs and didn't check carefully enough!
@playbackvintagehifihunter9669
@playbackvintagehifihunter9669 3 года назад
Saw, this and mistakenly thought it was a Audiolab 8000A lol
@DuncanWEDD2019
@DuncanWEDD2019 3 года назад
So did I (just on my tiny phone)... well I knew it was Sansui because he said. I'd forgotten about Sansui, but yes I had to do a double-take. "Thin pre-amp"? Think Burmester.
@playbackvintagehifihunter9669
@playbackvintagehifihunter9669 3 года назад
@@DuncanWEDD2019 I was going to say it's probably because inside is kept as simple as possible, which is best when it comes to preamps.. But this thing is crammed... Lol
@DuncanWEDD2019
@DuncanWEDD2019 3 года назад
@@playbackvintagehifihunter9669 Yes it does look 'busy'. I noticed that too and I am no electronics expert, sadly (a skill I greatly admire). I have no idea, in truth, and was only glancing at the facia. The more I look, the less the resemblance. But thanks for confirming that I wasn't the only one. Why is this honest, personable and highly dedicated engineer so far away? I can never send away my kit there. The only Dundee I know is where one says "That's not a knife - *this* is a knife. And THIS is a needle!"
@playbackvintagehifihunter9669
@playbackvintagehifihunter9669 3 года назад
@@DuncanWEDD2019 lol! Yes I would like to know there is a engineer like him near me, im UK and they are far ans few in between and charge ridiculous prices.
@TadeoCNTi
@TadeoCNTi 3 года назад
Hi . thanks for uploading this video. I recently bought the same preamplifier and I have a problem regulating the dc offset of the F2992 board. According to the service manual it must remain at - + 20mv, but the value changes constantly in a wide range - + of mV. Could you help me about it. I send you greetings
@LiquidAudio
@LiquidAudio 3 года назад
Hi Tadeo, I'd need the unit here of course for proper diagnosis, but this is a sign of aging components and the need for deep service. Full mechanical cleaning and service is the first step and then tracking down and eliminating any leaky or noisy transistors, replacing bad electrolytic capacitors etc.
@Stereosandotherfun
@Stereosandotherfun 3 года назад
why don't you replace the tantalum electrolytic capacitors?
@LiquidAudio
@LiquidAudio 3 года назад
Because they don't need to be replaced. Tants are used in some of the most expensive test and measurement gear for a number of good reasons.
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