Demonstrating a very logical consistent step by step methodical troubleshooting process makes for very educational and highly instructional content to everyone of your videos. We should all send the teacher an 🍎 for his new workbench in appreciation for his patience and skill in demonstrating how to do things safe and correctly. 😉
It will still be mono, both receivers will have the same mono audio track. Stereo has two different audio channels, the left and right channels are not the same.
Relative to 14:10, At work we use B&K capacitor ESR testers that are switchable to test the cap for shorts as well as ESR. They can be set to test for ESR alone, or ESR plus short circuit.
Wow, Tony! My grandparents had one of these in their Beacon Hill townhouse in Boston, when I was growing up! No cabinet - it was built-in. No stereo back then!
I bought one (with wood cabinet) at local Goodwill store 35 years ago for $25.00. It was in perfect condition. I am still regret to sell it on Ebay. I am enjoy your video so far.
Hi Tony, great work on these masterpieces! The design and circuitry looks frankly interesting on these first real HiFi electronics. I've seen from time to time some kind of de multiplexer on eBay, but never seen this particular Fisher model. You can also find alternatives using "recent" chips, but the nicest design for these still used tubes and a good amount of transformers, rectifiers and mixers. Grundig or Leek modules are well made and sounds good, but these are also becoming rare part of equipment. As the second power amp for the stereo will still be needed, it could be interesting to keep the other unit, or at least a similar power amp. Your minimal check of resistors and caps clearly demonstrates you can expect bad results from most chemical caps, and inconsistent results with carbon resistors. Their total replacement with modern quality components is a perfect solution, even if it represent a fair amount of time. What could also prove of interest is the tube sockets, if they show bad and oxydized, as these can benefit from a replacement with their modern exact equivalent. That's a difficult and long job, but when I see the moisture traces everywhere on the chassis, rust of the tuner shielding, I generally guess some Deoxit or equivalent will be needed to solve problems, but some will remain hard to solve when it comes to heat stressed sockets and pots. As this could end as a total rebuilding, the next stage is to check tubes on a tube tester (to get a idea of what life expectancy is left), the output transformers, and check the second unit! At some point, some best projects can evolve when it comes to hard to source or expensive components... Two units making a perfect final one?
There are 2 of these The Fisher 500 receivers here too. Oddly enough like your two one is in the Mahogany cabinet while the other does not have a cabinet. Question for you is; Have you removed the Escutcheon (Face Plate) ?? Being careful it seems there is something it’s catching on the right side with both nuts removed from the shafts and the screws on either side from the back side on toward the top.
I wonder why they didn't built it such that the PSU was separate and only supplied an H+ of 12V and a B+ of 12V and used the tubes that were being used in the last car radios ever made because the transistors of the day were not ready for prime time.
I would be interesting to see how that multiplex unit works. The early days of stereo were weird. There's no guarantee that the unit is comparable with today's multiplex system. I've got a Sansui were the baseband signal went to one channel and the return from the outboard multiplex went to the other. Definitely not compatible.
12:00 - "That's reading across something". I'd like to see where that is in the schematic - or do carbon comp resistors only go UP in value as they deteriorate - like that 280-Ohm 2-watter?
EL37's hard to get? Are you serious Tony? There's plenty of them, why I just saw a whole box of them at Paul Carlson's house! It's no wonder why I haven't seen any on eBay LoL.
mono=1spkr. U can connect 2spkrs to the 1(mono) spkr connct. but it'll only produce mono sound, not stereo. 2,3,4.. of these tuners will only result in same effct, mono sound. (It's a good sound, not stereo)
@@M0D60 thank you for your response. So if I connect 2 speakers on 1 of these Model 500 it will only give me 15w since it’s rated 30wpc? Right? Also, what will you guys can recommend for preamp with this Model of fisher? TIA
@@jef_acoustics4658 MY Undrstndng is 2spkrs connctd to 1 Fisher 500 = 30w of pwr both spkrs (mono). U cannot pair a separate Preamp to this receiver. The control knobs (bass, treble, tuner, phono..) on frnt and input conncts at rear is the preamp, pwr amp, tuner in one unit. (Their are utube videos wit 2 seperate Fisher 500 recvrs with 1spkr each. Perhaps it makes a difference?? I don't think so. imo)
For something as old as that is. I do not understand why you waste time testing capacitors that are famous for going bad with age? Just replace all of them, except for the ceramic ones. They are all going bad or will be bad soon. It's better to be safe, than sorry since rare tubes are used in the design, and modern capacitors are cheap.
As I have said many times, old caps like this should be replaced. If they haven't failed, they will fail. This video shows why. I do, however, think that when you just replace components without testing the circuit first, you can actually make it more difficult to troubleshoot other problems down the line. It is difficult to understand how a circuit works, when all you do is replace things without testing. I like to see the "before and after" effect of replacing a component. This way, I know if there are additional problems that I just added, additional problems beyond what I replaced, or no more problems. Thank you for the comment!
@@xraytonyb I agree with that. Always test components as it is a road map for what else could be wrong. Did the capacitor short due to age? or was they another problem in the circuit that caused the cap to fail. As I have said in many videos and classes, find out what works and it is easy to find out what has failed. Good troubleshooting Tony.
Yes, but there comes a point in trouble shooting that you see what should be done first and then you do whats needed and deal with the aftermath knowing what to expect.
Demonstrating a very logical consistent step by step methodical troubleshooting process makes for very educational and highly instructional content to everyone of your videos. We should all send the teacher an 🍎 for his new workbench in appreciation for his patience and skill in demonstrating how to do things safe and correctly. 😉
The best thing about your videos is seeing how you troubleshoot. Very useful and informative.
Yes two $$$ excellent mono receivers tuned to the same frequency will get you stereo! Check those resistors for correct tolerances. Very good advice!
It will still be mono, both receivers will have the same mono audio track. Stereo has two different audio channels, the left and right channels are not the same.
Great job on demonstrating how to work through the PS section when reviving one of these crusty relics. Can't wait to see the rest
Relative to 14:10, At work we use B&K capacitor ESR testers that are switchable to test the cap for shorts as well as ESR. They can be set to test for ESR alone, or ESR plus short circuit.
Production values skyrocketing, Tony. All the recent efforts are paying off. I also appreciate the careful work annotating the schematics.
Wow, Tony! My grandparents had one of these in their Beacon Hill townhouse in Boston, when I was growing up! No cabinet - it was built-in. No stereo back then!
I bought one (with wood cabinet) at local Goodwill store 35 years ago for $25.00. It was in perfect condition. I am still regret to sell it on Ebay. I am enjoy your video so far.
Hi Tony, great work on these masterpieces! The design and circuitry looks frankly interesting on these first real HiFi electronics.
I've seen from time to time some kind of de multiplexer on eBay, but never seen this particular Fisher model. You can also find alternatives using "recent" chips, but the nicest design for these still used tubes and a good amount of transformers, rectifiers and mixers. Grundig or Leek modules are well made and sounds good, but these are also becoming rare part of equipment.
As the second power amp for the stereo will still be needed, it could be interesting to keep the other unit, or at least a similar power amp.
Your minimal check of resistors and caps clearly demonstrates you can expect bad results from most chemical caps, and inconsistent results with carbon resistors. Their total replacement with modern quality components is a perfect solution, even if it represent a fair amount of time. What could also prove of interest is the tube sockets, if they show bad and oxydized, as these can benefit from a replacement with their modern exact equivalent. That's a difficult and long job, but when I see the moisture traces everywhere on the chassis, rust of the tuner shielding, I generally guess some Deoxit or equivalent will be needed to solve problems, but some will remain hard to solve when it comes to heat stressed sockets and pots.
As this could end as a total rebuilding, the next stage is to check tubes on a tube tester (to get a idea of what life expectancy is left), the output transformers, and check the second unit!
At some point, some best projects can evolve when it comes to hard to source or expensive components... Two units making a perfect final one?
Nice work Tony. I love the early Fisher equipment. I have a fondness for Lafayette too but hard to find.
I think this amp would be great to own restored it will probably last many more years.
Great exploring!
White Vinegar deals with rust like that most well. I've saved many a tools and other using it. Secondary corrosion is not problem.
Will try.
Another great video. I would really like to see your dim bulb diagram.
Love this already. Gorgeous!
There are 2 of these The Fisher 500 receivers here too. Oddly enough like your two one is in the Mahogany cabinet while the other does not have a cabinet. Question for you is; Have you removed the Escutcheon (Face Plate) ?? Being careful it seems there is something it’s catching on the right side with both nuts removed from the shafts and the screws on either side from the back side on toward the top.
I wonder why they didn't built it such that the PSU was separate and only supplied an H+ of 12V and a B+ of 12V and used the tubes that were being used in the last car radios ever made because the transistors of the day were not ready for prime time.
Good video and great explanation!
That's interesting about the Multiplex Output. Wasn't FM Stereo introduced later in 1961?
fisher audio is the holy grail
Nah, that would be iOS.
(Pointless Internet "holy grail" posts.)
If I am not mistaken I think I saw at least one "dogbone" resistor or one that looked like a dog bone resistor
Those are ceramic capacitors.
The new lab seems to have a high "reflectivity" constant.
Great video as usual thanks
I would be interesting to see how that multiplex unit works. The early days of stereo were weird. There's no guarantee that the unit is comparable with today's multiplex system. I've got a Sansui were the baseband signal went to one channel and the return from the outboard multiplex went to the other. Definitely not compatible.
12:00 - "That's reading across something". I'd like to see where that is in the schematic - or do carbon comp resistors only go UP in value as they deteriorate - like that 280-Ohm 2-watter?
I don't think there's any resistor that goes down in value as they fail.
Great vid.
Wonderful specimens.
EL37's hard to get? Are you serious Tony? There's plenty of them, why I just saw a whole box of them at Paul Carlson's house! It's no wonder why I haven't seen any on eBay LoL.
MC seems to have a garage full of EVERY type of tube. :)
Any way I can send you my vintage equipment to work on ? I would gladly compensate you !
i notice that has dual controls, is that a stereo amplifier?
Can you connect 2 speakers on this? Or you have to get two of these tuner to do that?
mono=1spkr. U can connect 2spkrs to the 1(mono) spkr connct. but it'll only produce mono sound, not stereo. 2,3,4.. of these tuners will only result in same effct, mono sound. (It's a good sound, not stereo)
@@M0D60 thank you for your response. So if I connect 2 speakers on 1 of these Model 500 it will only give me 15w since it’s rated 30wpc? Right? Also, what will you guys can recommend for preamp with this Model of fisher? TIA
@@jef_acoustics4658 MY Undrstndng is 2spkrs connctd to 1 Fisher 500 = 30w of pwr both spkrs (mono). U cannot pair a separate Preamp to this receiver. The control knobs (bass, treble, tuner, phono..) on frnt and input conncts at rear is the preamp, pwr amp, tuner in one unit. (Their are utube videos wit 2 seperate Fisher 500 recvrs with 1spkr each. Perhaps it makes a difference?? I don't think so. imo)
@@M0D60 yeah this guys have 2 amp
ua-cam.com/video/kS8LS_ZKyNg/v-deo.html
For something as old as that is. I do not understand why you waste time testing capacitors that are famous for going bad with age? Just replace all of them, except for the ceramic ones. They are all going bad or will be bad soon. It's better to be safe, than sorry since rare tubes are used in the design, and modern capacitors are cheap.
As I have said many times, old caps like this should be replaced. If they haven't failed, they will fail. This video shows why. I do, however, think that when you just replace components without testing the circuit first, you can actually make it more difficult to troubleshoot other problems down the line. It is difficult to understand how a circuit works, when all you do is replace things without testing. I like to see the "before and after" effect of replacing a component. This way, I know if there are additional problems that I just added, additional problems beyond what I replaced, or no more problems. Thank you for the comment!
@@xraytonyb I agree with that. Always test components as it is a road map for what else could be wrong. Did the capacitor short due to age? or was they another problem in the circuit that caused the cap to fail. As I have said in many videos and classes, find out what works and it is easy to find out what has failed. Good troubleshooting Tony.
Yes, but there comes a point in trouble shooting that you see what should be done first and then you do whats needed and deal with the aftermath knowing what to expect.
It all depends upon your individual skillset and the device you are servicing.
Never reform a cap, they are cheap and not worth losing a peace of equipment. I always replace with new tested caps.
First!
hi tony is it possible to have an email address for please
ron
ro