HOLD THE PHONE...
I may have located an alternative, or at least a point of contact for older systems:

Here is the link

Now, if you wanted to do an end around on the whole works, there are refurbished older recievers, amps, tuners, and god only knows what at this persons website. He appears to be running an electronics exchange somewhere, but I didn't look that deep.
ALWAYS VERIFY!!! Make sure its a real business. I'm pretty sure from what I've looked over that it is - and if so this guy has equipment to die for!

Older CLASSIC MARANTZ recievers (and some Kenwood, Sansui, Harmon Kardon - TOP names) for really favorable prices. They are "refurbished" and should be as good as new, and back then they were the absolute CREAM... I saw a Marantz 2230 that had me drooling.

There are a few Kenwood units, and several MARANTZ pieces that look downright sweet. Be careful not to get the input power handling and speaker output watts confused, this guy is a genuine tech and presents a detailed analysis of these items. He also has a standard blurb:

My gut instinct, and impression of the tech info the guy provides? He's genuine all right. And really knows his stuff.

OTHER READERS of this post: If you love FULL sound and old time amps, you might want to fasten your seatbelt before following that link. Lock up your credit cards in a safe and give your spouse the key while you're at it. THESE are the real deal from when quality components were reaching the state of the art.

I have no affiliation with the site at the above link, I honestly spotted it while looking for some source of info to assist DT 466.

I'm glad I did - I'm bookmarking it in my favorites.


DT: You might be able to weedle some advice on the unit you have, or either may I suggest you could use it as a trade in for a break in price? I'm just running through some possibilities here. The place may be interested in your unit. It seems to me better to have something really good, that's been gone over by a pro (especially if its cheap) than to mess with an iffy prospect at best...


~Wolf

 

Hard to tell from the picture, but it likely is a power resistor. My quess (and thats all it is) is that its in series with the speakers (as some protection from a short on the output). KOA is the resistor manufacturer. I'd also quess the value NOT to be 22 ohms - too high. Maybe .22 ohm? From the size, I'd quess 5, maybe up to 10W. If you have the resistance value and the power rating (this can always be higher without a problem), you can get these cheap (a few bucks at most). You could try and measure the other one, but if it less than 1 ohm or so, you'll have trouble getting an accurate reading with a typicall 'hand-held' meter.
Curious, if the resistor was mechanically damaged (i.e. hit), does that make sense? (i.e. how could that have happened, was the cover off for those years?)
If it was over-heated, electrically overstressed, and then 'fell-apart' chances are the problem is somewhere else and the resistor is just a symptom.
If interested, I can look up and see if I can find more info based on the #'s you provided.

 

Suggestion: A resistor shouldn't have three posts, should it? It looks like it may be a custom part made for Kenwood.

I had a tuff time trying to find schemo's alone, haven't tried to look into support parts so far. Dt said- 022 KOHM. That could be .022 KOhm, or 22 ohms. It is most likely a precision resistor, wirewound resistor, or the rating could be an impedance figure (micro transformer or some such).

Be nice to know who made it, wouldn't it?

Q: WHOIS the parent company behind Kenwood?

 

I agree. Electronics must have current flow from time to time. Otherwise the capacitors go bad. That is why if you see for sale "vintage xxxx still in the box" or "in excellent shape - hasn't been used for years" be wary. It most likely doesn't work and/or will need work to bring back to fully operable.

Sound like a protection circuit shutting things down due to excessive current draw or a defective circuit.

Reg

 

Greywolf, yes, resistors typically have 2 terminals - I quess I missed that (if it has three terminals) - unless its a resistor network (i.e. 2 resistor with one common) - seems very unlikely (they do make such, but they're almost always low-power). KOA is a resistor manufacturer, and still produces. If its 22 ohm, very likely you can measure the other - in circuit (with power off of course). Also, if it is a resistor, from the picture, its an 'cheap' ceramic housed one (very typically used in such applications). I'd quess a 5%, or even 10% tolerance. These style are usually low-inductance - most wire-wounds will have more inductance than a 'bulk' resistor (although they can be wound to reduce it).
Dt, if its a resistor, and we can determine the value, I'll gladly send you one (likely I've got one that will be a functional equiv) - assuming you can solder it in. . .

 

Well i found out the story about why it broke. From my dad when he saw me messing with it so it might help:

Turns out my brother had it cranked up to MAX and it blew the power supply fuse. My brother being the genious he is saw something my grandpa did and did it to this. Put foil in place of the fuse. I guess the resistor blew apart. or something. My brother is an idiot i do not take any credit for his ingenous ideas.

I'm thinking i might scout yardsales and buy all the stereo's i can find and try to fix this thing. I can probally get one for less than 5 bucks pretty new with Dolby 5.1 depending on how drunk the guy running the yard sale is.

My dad bought it new it has always worked until i found out why it was un plugged .today from my dad.

Is this receiver worth the trouble or is it a piece of crap?

Thanks a bunch for helping me guys.

They don't build stereo's like they used to .

The stereo in my garage is my dad's from Highschool he bought it used in the late 70 early 80's i guess it is from the early to mid 70's. It is awsome. It has AM/FM/FM something that doesn't pick any thing up/Tape/Phono.
It won't die. All the lights still work . And it has Awsome sound. Better than the new ones.

DT

 

Sorry for another post, and one kinda unrelated (maybe). . .
'afinepoint' is correct - there are capacitors that will dry-out, electrolytics being the most common for this. Others, like ceramic caps, have no 'shelf-life' issues. Electronics and most 'passives' (resistors, inductors, most capacitors, etc), even old power tubes really don't have a shelf life if made properly, although the solder (or an ICs solderability) might.

 

yes i can solder. i used to build slot cars.

Thanks for the offer. What kind of value do you need? I can probally find out if i knew what to look for.

Thanks

DT

 

The trick is to find a match for that exact component (good luck, by the way).

But the other side of the coin, given the new info, is that something ELSE is wrong in there...

What fried it? I can't tell you without standing over it with test equipment.

Components don't just "BLOW UP" because its friday, or the moon is setting.

There's a short somewhere...

Knowing circuitry as I do, I'd just about bet on a shorted transistor or a fried transformer.

Overloads usually draw hardest on transformers, since when other components fail the windings of transformers overheat and the insulation goes to pieces.

"POOF!"

-Look around it for a transformer that shows signs of char or stuff oozing out of it.

 

you think i should take it to a repair shop?

i don't know circuitry at all. wiring i do but not this stuff.

DT

 

Honest opinion?

I think if your brother did what you said, it has fried more components than we have space to list. Tracking them all down would amount to a major project. Junk it, or shelve it for another time when you have an electronics degree. To repair it would take a major effort and a long list of supplies.

The simplest and most cost effective answer is to replace it. YOUR TIME IS WORTH MONEY - remember that. The price of a repair at a shop would be FAR more than the thing is worth in the first place.

If you can find better at a yard or garage sale, use that instead.


~Wolf out

 

Well i we got by without it. I already have a stereo in my room.

I guess i'll be scouting the local sales.

I really appreciate all of your help.

Ya'll have been very helpful. If ya'll need help with anything i might be able to help with just shout.

Thanks

DT

 

Save five or ten bucks here and there - and only use it for that.
I built my best stuff just like that.
And hit all the garage sales you can get to!

I once found a Marantz 2800 for thirty five bucks.

ten-four-two

PS: Check out pawn shops too...

 

Heck i'm a teenager. I've been saving up for a new truck to drive while i fix up my 85. So i guess i'll have to open another savings account in my safe.. Then i'll go get a really good reciever.

DT

 

Your stereo isn't classic enough to warrent a repair manual that's easy to find. (Throw away) Yep, more than likely the KOA comes from KOA Speer Electronics - They make a lot of descreet components.

You'll see 3 legged resistors like this. They use them for voltage dividers, basically a "T". My guess is the engineer used these two as a balancing network, like cjstang posted, between two channels. But it's probably before the amplifier stage.

Most of these "T fitting" consist of 3 internal resistors in parallel/series. If you can safely unsolder the one, hopefully, good one and use your multimeter to test the different resistances - We might be able to reverse engineer something that would work, using a little math. Most you'ld be out is a couple bucks and a little time, but you might add something to the mental toolbox..