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  #1  
Old 05-13-2016, 11:46 AM
Captainclock Captainclock is offline
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KLH Model 21 found at Goodwill today!

Hello everyone today I found at Goodwill (work) a KLH Model 21 on the shelf in the electronics section in the store its kind of in rough shape as its missing the bass control knob and the grille cloth is coming loose and its got some lavander colored paint splatters on it but I figure for $7.99 one couldn't go wrong with such a classic piece of electronics history. So anyways I would like to know a little more about this unit as far as when it was made and a little bit about how it works and also as to where I could get a replacement knob for the bass control and how I could go about cleaning up the paint spatters on the unit. Any help and information would be appreciated.

Thanks,

Levi

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  #2  
Old 05-13-2016, 12:07 PM
Ed in Tx's Avatar
Ed in Tx Ed in Tx is offline
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I Google-searched it and found 7,840 results. Including one on Shopgoodwill com that sold for $60. You got a nice employee discount!
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Old 05-13-2016, 12:21 PM
Captainclock Captainclock is offline
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Quote:
Originally Posted by Ed in Tx View Post
I Google-searched it and found 7,840 results. Including one on Shopgoodwill com that sold for $60. You got a nice employee discount!
Thanks, and yeah I thought so too. I plugged it in to try it out and it seemed to be just a 60 hz. hum coming out of the speaker and no reception on the tuner so I'm guessing that the filter capacitor needs to be replaced at least, which is a 2000 MFD 30V electrolytic capacitor. As for the grille cloth it looks like it should be fairly easy to repair it. When I opened it up it looked like i was the first one to ever open the unit up as it still had its sound dampening pillow inside the case yet and it was pretty clean inside hardly a spec of dust inside the unit.
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Old 05-13-2016, 12:36 PM
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I have used a product called "goof off" successfully to remove latex paint splatters without damaging the underlying wood finish on older radios... I suspect that it would work ok on the KLH.

jt
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Old 05-13-2016, 12:55 PM
Captainclock Captainclock is offline
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Originally Posted by jr_tech View Post
I have used a product called "goof off" successfully to remove latex paint splatters without damaging the underlying wood finish on older radios... I suspect that it would work ok on the KLH.

jt
Alright, I'll see about picking up a bottle of that. The only problem is that there's some paint spatters on one of the knobs as well and I tried scratching it off with my fingernail and it wouldn't come off and I know goof-off isn't going to be good to use on something like plastic because it has stuff in it that hard on plastic, so I wonder what I would use on the knobs to clean them up.
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Old 05-13-2016, 02:09 PM
WISCOJIM WISCOJIM is offline
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Try the new Goof Off 2. "SAFE ON PLASTIC!"

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Old 05-13-2016, 02:12 PM
Captainclock Captainclock is offline
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Originally Posted by WISCOJIM View Post
Try the new Goof Off 2. "SAFE ON PLASTIC!"

OK, I'll see if I can find some.
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Old 05-13-2016, 07:30 PM
Captainclock Captainclock is offline
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Well I replaced the original 2000 MFD 30V Power Supply Cap in the radio with a 2200MFD 50V capacitor and its still has a 60Hz Hum coming out of the speaker and still no audio out of the speaker from the tuner. So what should I check next in the circuit that could be causing my issue? I also tried posting this in AudioKarma but for some reason when I went to post it it wouldn't post it would act like it was going to post the thread but then it would wouldn't actually post anything.
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Old 05-13-2016, 08:59 PM
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I would suspect that one or both of the diodes in the rectifier circuit could be shorted or have very high reverse leakage... you can get a manual here from Phil's old radio site:

http://antiqueradio.org/KLHModelTwentyOne21FMRadio.htm

Thanks again to Phil Nelson for his wonderful site,
jr
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Old 05-13-2016, 09:23 PM
zeno zeno is offline
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KLH built some very nice stuff. Our shop saw a lot
of it being 20 miles from Cambridge. Also piles of
H.H. Scott that was 5 miles away.
Anyhows change ALL the lytics first. I remember a few
of the stereo ones going DEAD in one channel & that
was it. ( 30 yrs ago ). Another thing that may be it
is if it uses ua703 IC's in the IF they were trouble
especially on Scotts sets. In any case when its running
again you will wonder what all the hoopla about digital is.

73 Zeno
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Old 05-13-2016, 09:50 PM
Captainclock Captainclock is offline
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Quote:
Originally Posted by jr_tech View Post
I would suspect that one or both of the diodes in the rectifier circuit could be shorted or have very high reverse leakage... you can get a manual here from Phil's old radio site:

http://antiqueradio.org/KLHModelTwentyOne21FMRadio.htm

Thanks again to Phil Nelson for his wonderful site,
jr
Thanks for the link, I tried to download the service manual but the link to the service manual in Phil's Website didn't work.
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Old 05-13-2016, 09:55 PM
WISCOJIM WISCOJIM is offline
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Try the link again. Perhaps the download is a bit slow, but it works fine here.

http://antiqueradio.org/art/KLH21ServiceManual.pdf

.
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Old 05-13-2016, 09:56 PM
Captainclock Captainclock is offline
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Quote:
Originally Posted by zeno View Post
KLH built some very nice stuff. Our shop saw a lot
of it being 20 miles from Cambridge. Also piles of
H.H. Scott that was 5 miles away.
Anyhows change ALL the lytics first. I remember a few
of the stereo ones going DEAD in one channel & that
was it. ( 30 yrs ago ). Another thing that may be it
is if it uses ua703 IC's in the IF they were trouble
especially on Scotts sets. In any case when its running
again you will wonder what all the hoopla about digital is.

73 Zeno
I believe mine's an original 21 so I don't think it has any IC chips in it. The electrolytics don't appear to be bad but of course they could be bad even if they don't look it (no cap bulge). The electrolytics are mainly on the amplifier board, there aren't any on the tuner board surprisingly enough. Now I noticed that the Model 21 has an RCA Plug that says "Tuner out" was this meant to be able to have a multiplex unit hooked up to it so it could be FM Stereo like the Model 8? Also I'm missing one of the knobs on this unit and I was wondering where I might source a replacement knob for this unit.
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Old 05-13-2016, 09:59 PM
Captainclock Captainclock is offline
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Quote:
Originally Posted by WISCOJIM View Post
Try the link again. Perhaps the download is a bit slow, but it works fine here.

http://antiqueradio.org/art/KLH21ServiceManual.pdf

.
It would download but nothing would show up as far as pictures or images go, it was just a blank grey page.
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  #15  
Old 05-13-2016, 10:02 PM
WISCOJIM WISCOJIM is offline
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It's a 27-page PDF file. Must be some trouble on your end.

.
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