Vintage JVC

[adason]

While visiting relatives in Slovakia, i tested my old hifi. If i remember correctly, this i got in early 80's. So this JVC stuff is 40 years old. Still works fine. Tuner is little drifting, signal selector on integrated amp needs deoxit, but all works. The original cassette deck is gone, was warned out, the replacement, not part of this, is great.
Right now there are two sets of small bookshelfs (tesla), as my floorstanders were given to my brother. Together with my real hifi, top of the line Technics.

One thing i noticed, this integrated JVC amp has variable loudness pot, which is usefull. And it does not have preamp section, the bass/treble is part of feedback of power amp. Interesting. I have seen this in Luxman.

If i had soldering iron, i would replace input cap, and feedback cap with mp. But i got nothing here. So it has to stay as is. No recap, no repair was done on this JVC stuff in 40 years.
In US i used to collect SuperA JVC stuff, still have some receivers, cassette deck and cd player. I was always impressed by quality and durability, yet affordable JVC stuff. May not be as fancy as Marantz or Luxman, but for me JVC and Technics was just right.

Posting just for fun.

 

[Galu]

JVC and Technics was just right.

JVC is now used as a trademark for home audio products that are certainly not to be confused with the quality products produced by the original Japan Victor Company.

I think you may be interested in this brief history:

The Japan Victor Company was founded in 1927 and went into the ownership of Matsushita Electric in 1953.

After 55 years of their ownership, JVC went under the ownership of JVC Kenwood Holdings in 2008.

In 2011 JVCKENWOOD Corporation became owners and have granted a license to Currys Group Limited to utilise its “JVC” trademark to sell “JVC” brand TV and Home Audio products in the UK.

https://uk.jvc.com/

 

[adason]

Agreed, its not what it used to be.
Onkyo filed for bankruptcy in 2021.
But the brand name was purchased and will continue.

 

[adason]

Here is random schematics from integrated Luxman amplifier.
All line level signals go through signal selector, then volume/balance straight to power amp. Bass/treble is part of the negative feedback.
Inspite of being lower model, it can sound quite good. I believe skipping the preamp section is keeping the signal cleaner.
If i remember correctly, i have seen one Nikko integrated with this arrangement too.

 

[mjf]

there are a few integrated amps with bass/treble section in the feedback loop.
iirc sanyo dca205, pioneer sa550, nad3020......................

 

[adason]

Nad3020? Are you sure? It clearly has separate preamp section with tone controls.

https://www.audioservicemanuals.com/n/nad/nad-60-7600/nad-3020/15044-nad-3020-schematic

 

[mjf]

sorry, an error - nad3020 not..........;
the yamaha A 520 could have it,
and the yamaha R 3 receiver,
and the luxman L 113a

 

[adason]

Here is nikko 590 integrated amp. I believe i had this one long time ago, when i was collecting nikko.

 

[WhiteDragon]

there are a few integrated amps with bass/treble section in the feedback loop.
iirc sanyo dca205, pioneer sa550, nad3020......................

It is interesting.

Recent thread here for pioneer SA550 repair.
Looking at the schematic realized tone controls in feedback loop

 

[mjf]

a close look into my jvc a-k300 (schematic) revealed it.................
there are tone controls in the feedback loop.

 

[adason]

It is interesting.

Recent thread here for pioneer SA550 repair.
Looking at the schematic realized tone controls in feedback loop

Yes, it does. Plus some weird muting circuit on the input.