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| Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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24th Apr 2012, 2:32 am
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#1 |
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Retired Dormant Member
Join Date: Sep 2010
Location: Ohio, USA.
Posts: 757
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Uher report 4000 reel to reel recorder
I was getting ready to put away my uher 4000 reel to reel, but i was bothered when the speed kept fluctuating, so i changed the 2000 UF capacitor and 1000 UF capacitor. Well after that the amplifier section quit working and the speed has been really slow, 7 1/2 ips is more like 3 3/4.
Anyone familiar with these recorders? -Chris |
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24th Apr 2012, 3:25 am
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#2 |
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Retired Dormant Member
Join Date: Sep 2010
Location: Ohio, USA.
Posts: 757
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Re: Uher report 4000 reel to reel recorder
DO NOT!!!! replace the 2000uF capacitor with a 2200uF or anything else, i tried that and found alot of problems, as soon as i doubled up on 1000uF capacitors and removed the 2200uF i had inserted the recorder went back to working properly and sounds very good.
All of the speed issues solved, no problems now! -Chris |
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24th Apr 2012, 8:57 am
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#3 |
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Octode
Join Date: Mar 2006
Location: Lund, Sweden
Posts: 1,632
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Re: Uher report 4000 reel to reel recorder
Weird. The tolerances on electrolytics is often +50%/-10% so that a 2000µF capacitor can be 3000µF and still be within spec. I wonder what's so special about the original 2000µF capacitor?
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24th Apr 2012, 3:16 pm
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#4 |
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Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
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Re: Uher report 4000 reel to reel recorder
I would suggest that the 2200uF capacitor was faulty or incorrectly installed.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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24th Apr 2012, 5:06 pm
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#5 |
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Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Uher report 4000 reel to reel recorder
Mis-installed or faulty capacitors would be my thinking as well. A typical "2000µF" capacitor with no stated tolerance could be anything from 1800µF to 3000µF.
Just for interest's sake, is your Uher the early 2-head or the later 3-head version?
__________________
If I have seen further than others, it is because I was standing on a pile of failed experiments. |
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24th Apr 2012, 6:35 pm
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#6 |
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Retired Dormant Member
Join Date: Sep 2010
Location: Ohio, USA.
Posts: 757
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Re: Uher report 4000 reel to reel recorder
It is the 2 head version, and no the capacitor checked out fine, i ended up using it on another machine. Funny huh?
-Chris |
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24th Apr 2012, 6:48 pm
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#7 | |
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Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
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Re: Uher report 4000 reel to reel recorder
Quote:
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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