Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Oct Wed 16, 2019 11:03 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 8 posts ] 
Author Message
 Post subject: KLH Model 25
PostPosted: Jun Wed 12, 2019 1:58 am 
Member

Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1220
Location: Albion, CA, USA, 95410
Hi All,

Well, there is in fact hope for millennials! A coworker and friend of mine has a KLH console and a pretty decent little record collection! From the Cars to the Clash to Benny Goodman.

While it plays, it has some issues. Takes a long time for the sound to reach full volume. Crossover caps? Sound is a little distorted even after it warms up. This is a SS rig so it shouldn't need to warm up.

Does anyone have a schematic? I see all sorts of other KLH manuals and whatnot but not the model 25.

Thanks!


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Wed 12, 2019 12:55 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 14788
Location: Fernandina Beach, FL
Sorry to say that I don't have the schematic. But before I would suspect crossover capacitors, I would suspect the usual electrolytic capacitors. This unit is getting rather old and I would bet that a careful replacement of electrolytic capacitors might fix it.

_________________
Don


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Wed 12, 2019 12:57 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 14788
Location: Fernandina Beach, FL
That being said, I will say that I have replaced many crossover capacitors in KLH Model 17 speakers. The tweeters had gone silent! New non-polarized electrolytic capacitors brought them back to life.

_________________
Don


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Wed 12, 2019 3:01 pm 
Member

Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1220
Location: Albion, CA, USA, 95410
Seems like info on this console is pretty hard to find. I'm sure the electrolytics are dried out, would that account for the slow warm up on a SS circuit?


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Wed 12, 2019 5:25 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 14788
Location: Fernandina Beach, FL
madlabs wrote:
...I'm sure the electrolytics are dried out, would that account for the slow warm up on a SS circuit?

I would think so. But wait for others to chime in on that. It is at that age of course and remember my experience with crossover capacitors in the KLH Model 17 speakers. I did several pair of them (my cousin and I both had a few pair at one time).

_________________
Don


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Thu 13, 2019 3:18 pm 
Member

Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1220
Location: Albion, CA, USA, 95410
For informational purposes, the model 25 is the same as the model 24, just in a different cabinet. So I have a schematic!

There are a couple of .005/1400V caps from line to ground.

Attachment:
klhpower.jpg
klhpower.jpg [ 60.94 KiB | Viewed 336 times ]


I assume I need Y type safety caps. Can the voltage be lower? I would imagine the voltage rating is so high because of the shock hazard should they fail.


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Thu 13, 2019 6:41 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4268
Location: Boston, MA USA
Those are probably disk capacitors. You can leave them in there.

Can you post the rest of the schematic?

-David


Top
 Profile  
 
 Post subject: Re: KLH Model 25
PostPosted: Jun Fri 14, 2019 3:12 pm 
Member

Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1220
Location: Albion, CA, USA, 95410
Thanks. If they are ceramic I guess I'll let them be. No need to look for work.

Here is a link to the schematic. https://www.hifiengine.com/manual_libra ... four.shtml

Making one of the right size for ARF would break it into quite a few pieces.


Top
 Profile  
 
Post New Topic Post Reply  [ 8 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB