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LEM Baby Tape Echo PSU
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Old 22nd September 2014, 11:36 PM   #11
Tape Echo is offline Tape Echo  United States
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Univox LEM XI Matrix

Plex.gr Audio Stereo HIFI Classifieds
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Old 23rd September 2014, 01:46 PM   #12
ManMadeAudio is offline ManMadeAudio  Netherlands
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Quote:
Originally Posted by Nigel Goodwin View Post
So is this just a rip-off of the WEM copycat?, particularly the name

WEM stood for Watkins Electronic Music - what about LEM.

Incidentally, the blue axial capacitors are probably Philips ones?, and as such have been EXTREMELY reliable - but I see a number of tantalum capacitors, and historically they tended to be VERY unreliable (usually going short or leaky).
those are not tantalums but strangly formed tropical fish caps, but i think one of the Philips caps is bad...even by touch a hum is audible...will change that one..

But ive changed the AC input from 30V to 36V and im getting faintly hearable repeats...but its more like a decaying sound.
When engaging rec head three (farmost of the playback head) with repeat down the echo is immediatly cut off, with repeat full open i can hear a faint repeat....so closed and open are sounding different which is good.

My hunch is that maybe one of the transistors is dead which should amplify the repeat signal....this will need further investigation....but im almost there

Now to identify the tranny...there are no markings on them as far as i can see....but first let take some measurements....

Regarding the motor...

Unfortunatly this is an AC motor and not a DC one...i own a Klemt Echolette S NG51 which indeed has two speeds but those motors have different windings to control the speed of the motor by adding or extracting a winding...so it wont be possible to add speed control in the way of the Klemt.
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Old 23rd September 2014, 01:55 PM   #13
ManMadeAudio is offline ManMadeAudio  Netherlands
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Quote:
Originally Posted by Mooly View Post
This might help with the caps. I'm out of my comfort zone on those older markings and would have to look up how they are derived. We had a similar discussion here part way through the thread though,

http://www.diyaudio.com/forums/solid...sistor-me.html

Your project looks great, and it all looks clean and in good condition. I'm not sure what to suggest over the repeat issue. Its very much a case of needing to be sat in front of one to get a feel for what is going on. Some of those axial caps could be way past there best by now... might be worth looking into.
Thnx for pointing out that thread!

According to this link http://frank.pocnet.net/other/Philip...CodeRC1966.pdf
the ones looking like tantalums are actrually "pin up caps" sexy!

btw the big silver cap in my LEM is made by Ducati
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Old 23rd September 2014, 02:16 PM   #14
ManMadeAudio is offline ManMadeAudio  Netherlands
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Some usefull information on pin-up caps

Capacitor - Wikitronics

scroll to halfway the page...it also explains the code
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Old 23rd September 2014, 02:23 PM   #15
Mooly is offline Mooly  United Kingdom
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LEM Baby Tape Echo PSU
Before my time. Actually I think I do remember seeing Ducati on some caps way back yonder.
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