These are incredible amplifiers. Insanely low distortion, bags of current and conservatively rated output, lovely design and well built. Some of the best amps of the '80s and thoroughly underrated.
@Reflectiveness3 ай бұрын
Always enjoy watching an expert repairman on Friday night.
@randolphblack25543 ай бұрын
JVC and their Super A amps allowed for super low THD, in the area of 0.005% . SEA was an acronym for Special Effects Amplifier which was a multiband graphic equalizer for Left and Right channels. JVC always used novel engineering to solve various audio problems. I have a JVC DD-7 cassette deck that has been refurbished and I love it. All of their stuff suffered from scratches due to stacking components which led to insufficient cooling problems and thermal damage.
@jfdramis3 ай бұрын
Great find! Very rare! The SuperA series from JVC/Victor of this era are very good. Especially the AX-7 and AX-9. Very "audiophile" sounding even by today's standards! When some pop up for sale, they go for WAYYY more than the 25$ you paid for! I have an AX-7. I've compared it to many many other amplifiers (vintage and new and at very different prices) and its a keeper! I have a few JVC amps. All i can say is that they made some really good stuff throughout the years. It's just sad that most people when they see a vintage JVC stuff marketplace, most of the time, they ignore it. JVC (just like Hitachi) don't have the "hype factor" of other brands like Kenwood, Pioneer, Sansui, Marantz ... even though they made some pretty serious hi end stuff!
@ianc49013 ай бұрын
JVC moved into home theater add on systems using cheap components and cheap construction techniques which ruined their reputation. Cutting corners and costs to maximise profit in the short term meant they went from being well respected to being known as a cheap brand which nobody trusted. There are still some people who remember how good the old JVC products were but most people only know their later products which were poor quality.
@jfdramis3 ай бұрын
@@ianc4901 Yep, like many other brands like Sansui, Fisher, Toshiba... Through the 80's and 90'S they started making low quality and cheap audio components. It's a good thing some of us had the chance to have/hear the great stuff that those brands made back then! ;)
@mikesaunders46943 ай бұрын
I rebuilt an A-X5 and it’s been my daily driver. Great amp….mine has a fully functional bottom flap. Don’t see too many 7’s and a 9 would be top of this line.
@essdee91432 ай бұрын
Love the way you figured out those LED upgrades 👍 and you explain it so well.. Keep up the great work 👍
@illuwatar703 ай бұрын
SEA is the equalizer series from JVC.
@Timothycan3 ай бұрын
SEA was, I think, a JVC thing. Basically, a JVC limited graphic equaliser could be connected, as was included on some amplifiers and receivers they made back in the day. I have a JVC JRS-201 receiver with an SEA built in, the letters stood for 'Sound Effects Amplifier', not really a full graphic equaliser, but it gave you a useful tone control set up.
@MrProvinspoul3 ай бұрын
"Dynamic Super-A is JVC's exclusive technology which combines the silky, distortion-free sound of a class-A amplifier and the robust efficiency of a class-B amplfier."
@knifeswitch59733 ай бұрын
Hey Trevor, good to see you. I did a rebuild on an A-X5 and was really impressed with the results. Punchy and clear as a bell. Every one I’ve seen was missing the door.
@tonep31683 ай бұрын
Normally an amp with super a or similar means that’s it’s a class a/b amp that can run in class a up to a certain power output, usually 5w or so. This maybe different, but I doubt it. S.E.A. Is JVCs version of a graphic equaliser. JVC made some lovely amps during the 80’s then they turned into junk by the mid 90s like most HiFi brands of the 70s.
@robertdavis57143 ай бұрын
Courage Trevor, this is the era that scares me to Death. Tape 2 on the front, never ever seen that configuration. JVC Service Caps..........1980 Built. Never seen that relay. Actually surprised how few the issues were. Keep in mind us American are in Fahrenheit mode.
@MichaelBeeny3 ай бұрын
When you first opened the lid, I thought the heatsink looked a little small for 100 watts per channel. I bet it would get very hot into 4 ohms. Still, probably fine with music. Quite a voltage drop from the power supply on load. Not what I would expect from a toroid. Bigger caps might help a little. Overall, quite a good performer for a medium-priced amplifier. Even better for $25.
@Zockopa3 ай бұрын
I still use the smaller A-X5 that i got for cheap over a decade ago. I also had to replace the lytics in the phono and poweramp- input board because they got backed over time. Other than that just cleaning the pots and switches. And so far it works fine. BTW: There is no IC for the Super-A circuit in the X5. Its build discretly instead. And the output stages are smaller models of the Fujitsu RET`s in the X7,hence just 70 W/8Ohm per channel. The transformer in the X5 is a "normal" one instead of the encapsulated torodial. Other than that both amps appear to be very similar. And yeah,i had the luck to get one with the frontflap intact. Anyway,these integrated amps are still top class and were engineered with the old hifi ideals in mind. The concept: phonopre passive pre with passive tonecontrols,filters and loudness,poweramps in true DC (well the fat foilcaps after the phono out are the only coupling caps in the entire amp). Its classic high quality of the audio JFet era of the late seventies: meaning JFets in the inputstages and ultrafast BJT`s as output powerstages - and realy high quality phonostages for both MM and MC. What is lacking somewhat is build quality imho. And by that i dont mean the electronic parts used,but how the amp is internaly structured. But i guess even back then the budget had its limits,although this amps werent cheap back then.
@ubtrippin99803 ай бұрын
1979-1981. Second to top of the series.
@tedbell44163 ай бұрын
Oh Trevor you silly goose
@SDsailor73 ай бұрын
JVC doesn't get a lot of love.
@borlibaer3 ай бұрын
Same in West Germany. They had been offered but less promotion by the dealership. Hard to find live in shops.
@borlibaer3 ай бұрын
Yea, I do remember that amp. As a boy I would like to have it if I would have had the money for. 😢 So my first amp was the Technics SU-8022k with ST-8011k tuner, still with me. I as well remember that JVC offered a very interesting tape deck that time I had seen in a shop.
@adityamody89423 ай бұрын
a wooden pannel is going to look good in place of the missing pannel.
@SDsailor73 ай бұрын
That is a nice amp! 90 watts per channel and 0.003 distortion. Would not mind having that one. 👍 1hz to 400hz according to hifiengine
@SDsailor73 ай бұрын
Correction 400K hertz
@ianc49013 ай бұрын
I wonder why they chose such a strange way to power and control the lamp ? They must have been either trying to prevent them flickering with power fluctuations or trying to prevent interference in the amp but I've never seen anything like it ! I was half expecting to see a few more modifications to this one to try to deal with some of the heat issues it has.
@toddbennett78603 ай бұрын
Hi Trevor, just a thought that you might try a piece of vcr or audio tape deck head cleaner, I was wondering if it would work better than paper to clean the contacts in old relays
@garyintexas3 ай бұрын
Hi Trevor, When you are replacing caps, I noticed on Digikey that there are many choices for brands and series types of capacitors with prices that can range for 0.08 to 0.52 cents. Do you have any recommendations or would like to comment on which caps you purchase for audio repairs. I just opened up my HK 590i after 40 years and see many leaking caps. Thanks.
@user-yn8mz5bf9y3 ай бұрын
The volume goes to 11 (120 decibels) when playing "Rush " only in Canada EH ! Why would you connect the speakers to the unit if you don't know if their is DC on the ouput NOT GOOD Yet another changes all the capacitor video
@tomaskorenek12593 ай бұрын
yet another miserable person on planet earth
@user-yn8mz5bf9y3 ай бұрын
TOO LONG !!!!!
@Reflectiveness3 ай бұрын
Learning requires indepth training.
@SergZak20233 ай бұрын
Too SHORT!
@user-yn8mz5bf9y3 ай бұрын
@@Reflectiveness training for what ? Are you going to apply for a job and say your qualification are you watch Trevor's videos because you know have electronics experience
@SDsailor73 ай бұрын
Oh, it's you again, you sure like Trevor's videos, nice 👍