When my ship was in Japan in 1978, my good friend bought the spec 1 pre amp, one of the spec power amps, the best Pioneer tuner, cassette deck and turntable. He also bought Bose 901 series III speakers. He was single. LOL On the way out of Tokyo bay our ship hit a giant rock. We were listening to his system. We ripped the front third of the ship off below the water line and almost capsized. I started unhooking the components and yelled at everybody to set everything down gently on the deck before going to general quarters. Priorities you know! LOL
@ 25:00 I couldn't help but think, that, after your description of that "start delay" relay circuit, that, it may have caused a slight difference in the L - R channel DC power supply voltages you checked before that. Although it was only a 1 volt difference, that was also with no load, and between the extra wire and relay contacts, that difference would be more apparent under full load.
we have storm "Babet" doing its thing outside here in UK this morning so sat inside with a coffee watching this in the comfort of my home. Thanks Tony this is going to be a good one.
I'm looking forward to this one. I know when you do a restoration for yourself you are more likely to make some interesting choices, like the soft start circuits in this video. Thanks Tony!
Thanks for making electronics fun. I own a lot of gear that needs a lot of work. I love all kinds of audio gear, but I’m a carpenter. Deadpan comedy! Next piece I’m working on is a Luxman R-1120A receiver. Special thanks for that older Carver restoration. I have one in the garage that powers clean because of your video. 👍🏽 🔊
Excelente Tony, buena la modificación que le hiciste ya que te vas aquedar con el y lo vas a usar en EEUU, aparte que opino lo mismo que tu de lo del arranque suave. Va a quedar mucho mejor con las placas de arranque suave que has usado en videos anteriores y sí este es un gran amplificador de potencia, he reparado varios pero los he mantenido originales, tengo el primo hermano de este, que es el Marantz 300DC que es similar en apariencia ya que posee dos VU meter y dos perillas de volumen y también es de 150 vatios por canal, claro la fuente de este es mejor ya que usa condensadores mas grandes, este usa condensadores de 22.000uF mientras que el Marantz usa 4 condensadores de 10.000uF 80 V.
Thanks, Tony. I was hoping you would do a series on the SPEC-2 Or SPEC-4 after viewing your series on the SPEC-1. I've got a beautiful SPEC-4 that I plan to restore this winter. I've also got a couple of SPEC-1's and SPEC-2's that I will be restoring. I really enjoy your videos. You do a fantastic job on each and every one of them. Keep up the great work!
I'm sure they would test pretty good. A lot of them do. If you are doing this restoration/repair on a budget, this would be one of the items you could often leave alone. When they do fail, however, they can damage the rectifiers and in some cases, even the power transformer, due to the huge amount of current the supply can deliver.
When I was in high school in the '70s I lusted after the SPEC-1/SPEC-2/SPEC-4 components. Of course they were way out of my financial reach. Looking forward to this restoration!
Good point on the voltage and current an analog meter puts across the test leads. NEVER test the resistance of a phono cartridge or tape head that way. Same goes for low level transformers used in some studio preamps.
Yes indeed, after 'switch on', the capacitors act almost like short circuit as there is no charge. At this point C*dV/dt is very high! I wonder what the initial current is for those milliseconds that initially pass!? One good reason why they carefully select the right fuses. Always a good video Tony!
The Pioneer SX-1050 lists the initial inrush current at 280 Amps, if there were no inrush limiting resistor in-circuit. This is with one transformer and two 22,000 uF caps. The Spec 4 has 2 transformers and 4 22,000 uF capacitors!
@@xraytonyb Wow!, thanks for the feedback Tony. I guess this will be if 'switch on' occurs at the peak of the AC sine wave. Sometime ago I estimated that the peak surge current for one of my 'moderate' amps was about 25 amps, I forget the exact figure.
Wouldn't it be better just to replace the big capacitors with banks of small capacitors split film, surely that eliminates the charging up issue but still holds a good charge and low ESR
1-Bunch of small caps take a lot of room, both physical space and board space 2-with more individual caps chances of failure goes up 3-If one cap shorts out, the entire bank will fail (caps in parallel), if one cap opens the entire bank will fail (caps in series) 4-cost
Silly comment. I have the same Pentel 0.7 mechanical pencils. I can't say for sure when I bought it. Likely some time in the 80's. (yep, I'm one of those nerds too)
I get what you’re saying, but channels like this and Carlson’s are for learning. Even though I already know everything Tony is talking about I appreciate that it talks through the theory of the work. Shows that he is competent and the main thing is people learn. When I started repairing vintage electronics full time about 10 years ago I appreciated sources like this in expanding my knowledge. If you want a video of solder, solder, solder there are many channels you can go to.
@@danhorton6182 Yeah, you are right. It is good to hear things again, refreshes the memory and engages a different thought process. My bad. Edit: repetition
When my ship was in Japan in 1978, my good friend bought the spec 1 pre amp, one of the spec power amps, the best Pioneer tuner, cassette deck and turntable. He also bought Bose 901 series III speakers. He was single. LOL On the way out of Tokyo bay our ship hit a giant rock. We were listening to his system. We ripped the front third of the ship off below the water line and almost capsized. I started unhooking the components and yelled at everybody to set everything down gently on the deck before going to general quarters. Priorities you know! LOL
Ah, those Navy days! We had the best grub and stereos!
@ 25:00 I couldn't help but think, that, after your description of that "start delay" relay circuit, that, it may have caused a slight difference in the L - R channel DC power supply voltages you checked before that. Although it was only a 1 volt difference, that was also with no load, and between the extra wire and relay contacts, that difference would be more apparent under full load.
I owned one of these in the 1980's and it was a superb amplifier. Good luck with your restoration!
You are a very fortunate man! The nice thing about beasts of this vintage is that they can be rebuilt. I look forward to your series on this beauty.
we have storm "Babet" doing its thing outside here in UK this morning so sat inside with a coffee watching this in the comfort of my home. Thanks Tony this is going to be a good one.
This is fun to watch. Thanks for unraveling the connectivity of the transformers for us.
Much better description of this is coming up in part 2. ;)
WoohooI I already did mine. It will be interesting to see what I missed.
I love when the covers come off - this one was a WOW!
I'm looking forward to this one. I know when you do a restoration for yourself you are more likely to make some interesting choices, like the soft start circuits in this video. Thanks Tony!
thanks tony , this series is gonna be great
Lovely amp - it's alway special when it's something you've wanted for a while .
Thanks for making electronics fun. I own a lot of gear that needs a lot of work. I love all kinds of audio gear, but I’m a carpenter. Deadpan comedy!
Next piece I’m working on is a Luxman R-1120A receiver. Special thanks for that older Carver restoration. I have one in the garage that powers clean because of your video. 👍🏽 🔊
Excelente Tony, buena la modificación que le hiciste ya que te vas aquedar con el y lo vas a usar en EEUU, aparte que opino lo mismo que tu de lo del arranque suave. Va a quedar mucho mejor con las placas de arranque suave que has usado en videos anteriores y sí este es un gran amplificador de potencia, he reparado varios pero los he mantenido originales, tengo el primo hermano de este, que es el Marantz 300DC que es similar en apariencia ya que posee dos VU meter y dos perillas de volumen y también es de 150 vatios por canal, claro la fuente de este es mejor ya que usa condensadores mas grandes, este usa condensadores de 22.000uF mientras que el Marantz usa 4 condensadores de 10.000uF 80 V.
Thanks, Tony. I was hoping you would do a series on the SPEC-2 Or SPEC-4 after viewing your series on the SPEC-1. I've got a beautiful SPEC-4 that I plan to restore this winter. I've also got a couple of SPEC-1's and SPEC-2's that I will be restoring. I really enjoy your videos. You do a fantastic job on each and every one of them. Keep up the great work!
Hi Tony. Would be nice to see those old filter capacitors tested after you remove them. Good luck.
I'm sure they would test pretty good. A lot of them do. If you are doing this restoration/repair on a budget, this would be one of the items you could often leave alone. When they do fail, however, they can damage the rectifiers and in some cases, even the power transformer, due to the huge amount of current the supply can deliver.
I would do the same just curious. @@xraytonyb
When I was in high school in the '70s I lusted after the SPEC-1/SPEC-2/SPEC-4 components. Of course they were way out of my financial reach. Looking forward to this restoration!
This amp sady was mine. I hope it works as it used to.
I'll do my best.
Your electric bill was just reduced by 760 watts! hee
The adventure to get it to Tony that weekend is one we still talk about lol. West Va = windy roads, not to mention 3women asking are we there yet?
Looks like the Sansui ba 3000 power amp I restored and sold
That orig. soft-start circuit should be called a "Halfsoft-Halfbaked" circuit.
Vacuum tube start up Nice....love the thermal fuse use.😃😄😁😆😅 5 Smile's.
Just a bimetalic switch.
Good point on the voltage and current an analog meter puts across the test leads. NEVER test the resistance of a phono cartridge or tape head that way. Same goes for low level transformers used in some studio preamps.
Now you owe me a new keyboard, since this one got shorted from all the drooling.
Yes indeed, after 'switch on', the capacitors act almost like short circuit as there is no charge. At this point C*dV/dt is very high! I wonder what the initial current is for those milliseconds that initially pass!? One good reason why they carefully select the right fuses.
Always a good video Tony!
The Pioneer SX-1050 lists the initial inrush current at 280 Amps, if there were no inrush limiting resistor in-circuit. This is with one transformer and two 22,000 uF caps. The Spec 4 has 2 transformers and 4 22,000 uF capacitors!
@@xraytonyb Wow!, thanks for the feedback Tony. I guess this will be if 'switch on' occurs at the peak of the AC sine wave.
Sometime ago I estimated that the peak surge current for one of my 'moderate' amps was about 25 amps, I forget the exact figure.
Wouldn't it be better just to replace the big capacitors with banks of small capacitors split film, surely that eliminates the charging up issue but still holds a good charge and low ESR
If they can do 12 amps current...
@@Parkhill57 they wouldn't have to you would divide it by how many capacitors
1-Bunch of small caps take a lot of room, both physical space and board space
2-with more individual caps chances of failure goes up
3-If one cap shorts out, the entire bank will fail (caps in parallel), if one cap opens the entire bank will fail (caps in series)
4-cost
NO.
I would prefer to keep it original as posible.
Definitely gonna be a fun one
I love the smell of Essence of Allan Bradley in the morning.
Nice! I had a CTF-1000 cassette deck with the rack handles and a PL-630 turntable that would have looked great with this amp.
Hey, I've got the same things, among with a SA-8800, TX-9800, RT-909 and 707 and many more.🙂🙂
My CTF-1000 is long gone. Kept the handles, though!. Still have my PL-570 turntable. Sansui amps, though.
Sadly, I no longer have the CTF-1000 or the PL-630. I do still have an RT-707 but it hasn’t been used in many years.
Parece o painel com o PM-5000 da Polyvox
Silly comment.
I have the same Pentel 0.7 mechanical pencils. I can't say for sure when I bought it. Likely some time in the 80's.
(yep, I'm one of those nerds too)
looks fine to me but i am not picky but a bit of time and it will look great
From the appearance it looks like it was used at outdoor rock venues with no shelter!
I think I saw it at Kitty's Steak Pit and Dance Hall before it burned down. See if it smells like beer.
This is like Carson’s lab, talk talk talk talk talk, solll-der, talk talk talk talk. If people are watching this, they get it. Talk talk talk talk.
Perhaps we are talking to someone other than you. Some people complain, complain, complain.
I get what you’re saying, but channels like this and Carlson’s are for learning. Even though I already know everything Tony is talking about I appreciate that it talks through the theory of the work. Shows that he is competent and the main thing is people learn. When I started repairing vintage electronics full time about 10 years ago I appreciated sources like this in expanding my knowledge. If you want a video of solder, solder, solder there are many channels you can go to.
@@danhorton6182 Yeah, you are right. It is good to hear things again, refreshes the memory and engages a different thought process. My bad.
Edit: repetition
@@xraytonyb I reacted without thinking, TonyB, I was stoked on seeing more action with the Spec amp. Those things are cool! Thanks for videoing, cool.
This is only part 1 of a series. There will be plenty of action (and hopefully not smoke). No worries ☺
Unfortunately, there's an "Unfortunetely" in your canned intro. Just noticed. FYI.
I guess that's what happens when you're an ee student.
👍
The journey begins! Thanks Professor, looking forward to this project.