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HELP, value my Amp please, 70's, Made In Japan, rare/unknown ~

post #1 of 15
11/23/10 at 7:51pm
Thread Starter 

 

Hello everyone,

 

Just looking for a  ballpark figure  on the value of this amp please. =)  Or an amp of similiar kind from the same era or whatever.

 

I'll most likely be trading this amp very soon for some headphones/IEM's, and I don't actually know what it's worth, I really have no clue, so I thought I'd quickly check on head-fi in case someone knows about it, or have some interest in it =)  I don't want to lose something special, or rip-off the person I'm trading with.

 

It's an integrated amp (aux, tuner, mag, tape, cer), with headphone out of course, it can power SA5000 at 1/4 volume or less, and k701 at 1/3 volume.  I was told by someone it sounds like a Luxman amp, and that I could upgrade it with electrolytic capacitors and it would sound like pure gold, (whatever the hell that means).  I have not heard many amps so I do not know.

 

 

JH Two Twenty Five - Imperial One Thousand

 

70's

 

Japan

 

Does not exist on the internet, as far as I can tell.  Doesn't exist in catalogs either apparently.

 

All the knobs and levers have a very nice high quality vintage feel to them.

 

Heavy, all metal silver coloured except the top panel which is a piece of black vinyl or something, I pried open the top once and everything looks hand-made so to speak including the circuit board, lots of wires and some sort of coil the size of a baseball, sorry I don't know anything about amps.

 

Can post photos later.

 

 

Thanks in advance for any INFO or random price estimates. =)

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post #2 of 15
11/23/10 at 9:08pm
if you post pics, please include a few of what's inside
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post #3 of 15
11/24/10 at 8:46pm

I can't tell how beautiful she is without looking at her. Most of old amp is like how you described.

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post #4 of 15
11/24/10 at 9:53pm

Sounds interesting, however when it comes to vintage gear "brand name" is usually the selling point.  Of course that is depending if you can find a buyer.

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post #5 of 15
11/25/10 at 4:08am
ahoi/ohai maytes!

here we have pictures: http://www.head-fi.org/gallery/album/view/id/18569/user_id/125162

(front/back panel/under mesh, birds eye inside, close ups of each board and back panel inside/front panel inside and of transformer/large caps).

sorry, didn't color correct and the lighting is a bit piss poor on some (it is night time here biggrin.gif)

of the big amp kiteki talked about. I sort of may have paid about $200 for it lol. Well, or so was the residual value in the trade.


Unfortunately, at my place it gets funky ground loop issues and generally seems to be picking up AC interference... IDK, maybe I need to replace the caps: (looks like it's stuffed with them...and transistors...)

10ish 50v 4.7uf, 10ish 25v 100uf, 2x 35v 470uf, 3.3uf 50v (4). and the 3 large caps I can't ID yet, because the I need to take them out of the mounts to read what the markings say. (the nuts and screws seem stuck, need a better fitting screwdriver/thingy unscrewer)

Otherwise, seems to me like a standard fully discrete fet thingy amp. (also seems to be a speaker amp aside from the HP amp O.o). Then again, to me it's all transistors, resistors and caps biggrin.gif... maybe someone else recognizes the specific design and can comment on whether it's worth refreshing the caps/trying to do something about the ground loop/ac noise.

Front panel has h/l fre filter switches and bass/treble regulators, along with bal slider and other funky things...makes me want to bypass all of them.


The board underneath is handmade with trace tracks done using solder lines...
Edited by svyr - 11/25/10 at 4:29am
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post #6 of 15
11/25/10 at 6:09am
Thread Starter 

Imperial_One_Thousand_-_JH_TWO_TWENTY_FIVE.jpg

 

 

 

 

Just for clarification, I traded some items with svyr today, br/sacd player, headphones, and this amp!

 

I don't think it could have gone to a better person, just look at all the pictures he took, and he's ID'ing all the transistors, resistors and capacitors.

 

Unfortunately, it is sensitive to picking up background noise, at my house it is dead quiet out of the sacd player, and at his house there is a lot of noise.

 

 

 

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post #7 of 15
11/25/10 at 12:35pm

Tough to say, looks like a cool amp.  Clearly made for the EU market with the din inputs.  It has a hefty transformer on it and decent size capacitors, do you know the output on this amplifier?  But those pictures are tiny on my 24" screen.  As well, take it over to AudioKarma.org there are more umm "vintage" guys over there, lol.

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post #8 of 15
11/25/10 at 5:22pm

Thanks. Will do.

 

I dread replacing the caps on this one... Way too many caps o.O . I thought it might take 4-5h, but since there are over 30 caps, probably a whole day or 1/1/2 days...It'd be funny if it still doesn't end up any less sensitive to AC noise after it too.

 

>It has a hefty transformer on it and decent size capacitors, do you know the output on this amplifier? 

 

Not sure about the output (there's also HP and Speaker outs, so two figures there). goes very loud on hp out.

 

Not sure whether the transformer is ok. The paper thingies shown on pics worry me.

 

 

> But those pictures are tiny on my 24" screen. 

 

lol. Usually I'd resize pics to be around 1600 px or 800px max wide... Maybe I should reconsider that.  

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post #9 of 15
11/25/10 at 6:17pm

Hard to say how much power it produces but I wouldn't be surprised if it pumped out 25wpc.

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post #10 of 15
11/25/10 at 7:09pm

mmm, I presume we're talking speaker, not hp out here...then sure.
 

Quote:
Originally Posted by mythless View Post

Hard to say how much power it produces but I wouldn't be surprised if it pumped out 25wpc.

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post #11 of 15
11/26/10 at 4:13am
>But those pictures are tiny on my 24" screen.

nothing wrong with your screen. Generally if I upload a single hi-ish res pic, the forums seems to keep the original and show a rescaled thumbain.
However, seems like if I use the batch java uploader, it rescales the pics first for lower size/faster upload....
To be honest 400 x 300 images is plain f-g ridiculous. must notify admins.... fml.

edit:

ah, ok, it's not the java uploader, it's the album view... It doesn't provide a hyperlink to a full sized image.
Edited by svyr - 11/26/10 at 4:17am
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post #12 of 15
11/26/10 at 4:22am
feast your eyes mateys!

http://www.head-fi.org/image/id/671985
http://www.head-fi.org/image/id/672006
http://www.head-fi.org/image/id/672005
http://www.head-fi.org/image/id/672004
http://www.head-fi.org/image/id/672003
http://www.head-fi.org/image/id/672002
http://www.head-fi.org/image/id/672001
http://www.head-fi.org/image/id/672000
http://www.head-fi.org/image/id/671999
http://www.head-fi.org/image/id/671998
http://www.head-fi.org/image/id/671997
http://www.head-fi.org/image/id/671995
http://www.head-fi.org/image/id/671994
http://www.head-fi.org/image/id/671993
http://www.head-fi.org/image/id/671992
http://www.head-fi.org/image/id/671991
http://www.head-fi.org/image/id/671990
http://www.head-fi.org/image/id/671989
http://www.head-fi.org/image/id/671988
http://www.head-fi.org/image/id/671987
http://www.head-fi.org/image/id/671986

hi res pic links biggrin.gif
also, f... the huddler engine and the people who conduct usability testing for it.


>and he's ID'ing all the transistors, resistors and capacitors.

reading the black writing on grey caps is a challenging task that I'm proud of accomplishing wink.gif
Edited by svyr - 11/26/10 at 4:32am
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post #13 of 15
11/26/10 at 5:42am

oooo the amp is a tiny amp, hrmmmm but it looks pretty cool!

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post #14 of 15
11/26/10 at 6:57am
Thread Starter 

 

Quote:
Originally Posted by svyr View Post

feast your eyes mateys!

http://www.head-fi.org/image/id/671985

 

Far-left... what's that "ground" for?  I've assumed it has something to do with vinyl. 

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post #15 of 15
11/26/10 at 7:09am
Quote:
Originally Posted by kiteki View Post

 

Quote:
Originally Posted by svyr View Post

feast your eyes mateys!

http://www.head-fi.org/image/id/671985

 

Far-left... what's that "ground" for?  I've assumed it has something to do with vinyl. 


look at the back of SRM-300 lol. I was told both are for connecting the pin to ground (as in separate ground outlet...technically it also connects to ground inside the amp, but it seems to follow that if you connect a lower resistance source then it'll become the new ground... idk maybe I'm wrong there.)
Edited by svyr - 11/26/10 at 7:15am
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