I was hoping I could get some opinions on this Adcom 5800 restoration kit. Cost is stated at 295.00 (make an offer).
https://www.ebay.com/itm/1656357443...jyrKVaT2T3usOX53luZLTpFOsQ==|tkp:BFBMpJL6v-pi
It does not seem a super far-fetched price for everything that is included, just in my opinion, and of course it would be a timesaver in-regards to having everything in one package instead of researching everything myself, and searching out all of the part numbers, parts, etc.
The one thing that I do question is the kit has 22000uF capacitors instead of the 24000uF is that came stock in the unit. I also inquired if the transistors are hand matched, and the seller stated they were not. I had looked up for a replacement 24000uF capacitor, and I could not find any around that appear that they would work and the seller said that is one of the reasons he dropped the capacitor, micro farad range down to the 22.
I have placed the description from the seller of the kit below in case people rather read it here than searching through the eBay ad itself.
Any opinions, thoughts, etc. on if this kit seems to be worthwhile would be greatly appreciated. Thank you very much for your time.
Description from eBay item:
The scarcity of good, honest techs who can do good and reasonably priced restoration/rebuild of audio equipment inspired me to create this restoration kit. In today's day and age, it is difficult to find a knowledgeable technician who can service your audio gear properly. I have seen many poor quality restorations of equipment that cost way too much for their owners. In 99% of the cases, only a few parts were replaced, instead of a full and proper restoration job.
A proper restoration must replace all electrolytic capacitors on all boards. Do not fall for partial kits that restore just one PCB (power supply, power amp, etc.). This is not a good or proper way to restore your audio equipment. It is the same as with car tires; one should never replace just one tire and keep the other worn-out tires on. A proper rebuild requires a full recap of all PCBs.
On the other hand, if one succeeds in finding a good tech, the wait time is usually 6-12 months for the unit to be serviced, and costs are sky-high. I have been servicing audio equipment for many years and have developed deep respect for all good equipment. Knowing how amazing and warm these units can sound, I decided to put together this kit. It includes very good upgrades and improvements that must be done to the unit. This restoration kit will make a huge difference in the sound quality. All the parts are of high-quality Japanese Nichicon / Rubycon / IC / United Chemi capacitors.
I am extremely particular about the quality of the parts provided in this kit. Knowing how many bogus/fake caps, diodes, resistors, etc. are out there, I source all the parts from reputable wholesalers and buy them in bulk.
Vintage audio equipment has the potential to deliver rich and authentic sound when it is properly restored. Not only can it enhance your listening experience, but it can also evoke memories and bring joy to your life. Let's work together to bring your vintage gear back to its full potential, and make sure you have the music you deserve.
https://www.ebay.com/itm/1656357443...jyrKVaT2T3usOX53luZLTpFOsQ==|tkp:BFBMpJL6v-pi
It does not seem a super far-fetched price for everything that is included, just in my opinion, and of course it would be a timesaver in-regards to having everything in one package instead of researching everything myself, and searching out all of the part numbers, parts, etc.
The one thing that I do question is the kit has 22000uF capacitors instead of the 24000uF is that came stock in the unit. I also inquired if the transistors are hand matched, and the seller stated they were not. I had looked up for a replacement 24000uF capacitor, and I could not find any around that appear that they would work and the seller said that is one of the reasons he dropped the capacitor, micro farad range down to the 22.
I have placed the description from the seller of the kit below in case people rather read it here than searching through the eBay ad itself.
Any opinions, thoughts, etc. on if this kit seems to be worthwhile would be greatly appreciated. Thank you very much for your time.
Description from eBay item:
The scarcity of good, honest techs who can do good and reasonably priced restoration/rebuild of audio equipment inspired me to create this restoration kit. In today's day and age, it is difficult to find a knowledgeable technician who can service your audio gear properly. I have seen many poor quality restorations of equipment that cost way too much for their owners. In 99% of the cases, only a few parts were replaced, instead of a full and proper restoration job.
A proper restoration must replace all electrolytic capacitors on all boards. Do not fall for partial kits that restore just one PCB (power supply, power amp, etc.). This is not a good or proper way to restore your audio equipment. It is the same as with car tires; one should never replace just one tire and keep the other worn-out tires on. A proper rebuild requires a full recap of all PCBs.
On the other hand, if one succeeds in finding a good tech, the wait time is usually 6-12 months for the unit to be serviced, and costs are sky-high. I have been servicing audio equipment for many years and have developed deep respect for all good equipment. Knowing how amazing and warm these units can sound, I decided to put together this kit. It includes very good upgrades and improvements that must be done to the unit. This restoration kit will make a huge difference in the sound quality. All the parts are of high-quality Japanese Nichicon / Rubycon / IC / United Chemi capacitors.
I am extremely particular about the quality of the parts provided in this kit. Knowing how many bogus/fake caps, diodes, resistors, etc. are out there, I source all the parts from reputable wholesalers and buy them in bulk.
Vintage audio equipment has the potential to deliver rich and authentic sound when it is properly restored. Not only can it enhance your listening experience, but it can also evoke memories and bring joy to your life. Let's work together to bring your vintage gear back to its full potential, and make sure you have the music you deserve.
I was just looking at snap-in capacitors with multiple legs and was wondering if it’s feasible and/or actually doable to snip off the non-voltage carrying pins and solder the two that are remaining?
So, as an example from the attached photo. To snip off the two or three legs from the capacitors shown in the photo, and then get the capacitor inserted and solder the two legs that are needed.
So, as an example from the attached photo. To snip off the two or three legs from the capacitors shown in the photo, and then get the capacitor inserted and solder the two legs that are needed.
That 8% decrease in PS capacitance would be least of my worries. Those Papa-designed 5800 units sounded substantially better than the 555 and 565 models, so it's worth pursuing. I have heard 5800 units that had tweaked up the bias a little more into Class A and sounding especially suave, worth looking into if one is tearing into the unit.
The reason I bought that is because Mr. Pass is the one who designed it. I figured it was my only chance to purchase one of his actual design units.
The stubs could short to traces or planes in the board. Best to use parts with the correct footprint.
That guy have terrible reputation on audiokarma, he had changes his store name a couple times.
Thank you very much for that information, as I had no idea about that. I will have to check around and see if anybody else has one of these.
One of the main reasons I was looking to shorten the process of this is I have just had a terrible run of health issues over the past 6 to 7 years and sometimes you just don’t know when you’re gonna run out of time.
Here's the service manual. All the parts are listed, and it isn't hard to find replacements at DIgikey or Mouser.
Just confirm that the length of the parts you choose will fit the board. There aren't really that many parts.
If necessary, buy a cheap digital micrometer from ebay, they run only around $10-$20.
Maybe someone here already has a BOM made up and can post it for you.
https://www.ebay.com/itm/404446503785
Just confirm that the length of the parts you choose will fit the board. There aren't really that many parts.
If necessary, buy a cheap digital micrometer from ebay, they run only around $10-$20.
Maybe someone here already has a BOM made up and can post it for you.
https://www.ebay.com/itm/404446503785
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Thank you very much manual , I do you have that and the owners manual.
I did check over on Audio karma and the guy I listed above definitely has a storied history.
I believe I take my time and measure all components for fit purposes and make my own BOM and take care of everything myself. This is one amplifier I want no mistakes on.
Thanks to all who replied.
I did check over on Audio karma and the guy I listed above definitely has a storied history.
I believe I take my time and measure all components for fit purposes and make my own BOM and take care of everything myself. This is one amplifier I want no mistakes on.
Thanks to all who replied.
Regarding Adcom, this fellow is the man, check the FAQ
https://hoppesbrain.com/adcom-faq/
Based on his information and size of your amp I would say that this ones can work
https://www.mouser.com/ProductDetail/KEMET/ALS80A243QC100?qs=AQlKX63v8RtLqG2HAc5Dpw==
https://hoppesbrain.com/adcom-faq/
Based on his information and size of your amp I would say that this ones can work
https://www.mouser.com/ProductDetail/KEMET/ALS80A243QC100?qs=AQlKX63v8RtLqG2HAc5Dpw==
Check the mechanicals on that capacitor. It's hard to get, and expensive if it does not fit.
Digikey has them in stock, but not Mouser.
https://www.digikey.com/en/products/detail/kemet/ALS80A243QC100/6872089
Digikey has them in stock, but not Mouser.
https://www.digikey.com/en/products/detail/kemet/ALS80A243QC100/6872089
You're absolute right, I totally forgot how those amps use the filter caps to support boards (so Adcom), I don't think they work because are too small
So capacitor size is critical.
Thank you very much for the information. I went over and checked out his website, but it appears he only works on four Adcom models and the one I am interested in he does not deal with. That includes his parts section, refurbishing, and/or in the FAQs.
Forgot to mention, that when I picked up the 5800 I also picked up two other Adcom units (Adcom GTP 350 and Adcom GFA-535) and one of those he does work on, which is the 535 so his site can still be of nice value to me. These were all one owner units who had not had them in his system for years and years and all original boxes and manuals.
If it sounds good and the bias and the DC offset are behaving, I wouldn't replace the transistors. Look at the service manual posted above and it's testing procedures.
Adcom GFA-5800, this is the source
https://reverb.com/item/3466494-adc...balanced-studio-monitor-power-amp-made-in-usa
It was my understanding he only did the 5800, but I may need to check the thread that covers all the designs he did (I think it is a sticky in this sub forum). Thanks,