Beolab 5000 Amplifier Mexico

313 replies
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- Or the HFE of the idle current transistor is too low.

Martin

As of 17:55 o'clock Wednesday October 4, 2015, I 'm listening to music through a BL 5000 classic amplifier, using my Beovox 3702 for test.

First song was of course Suzi Quatro, I walk through the fire with you. This because this beautiful BL 5000 did just that and will do in the future, well there was no real fire, just in my soul to get it working,

The problem was dead 470 Ohm resistor, (open circuit) and the stupidity of the restorer. I inverted the emitter and the collector of the BC115 idle current transistor, i found it, Martin and Jacques brought me on track, THANK YOU guys.

I am monitoring the idle current as it plays, all sliders work without noise, high/low filter work, loudness work. the tape selector gives some noise when turning on and off, but I think working the switch will take care of that, probably there will more of this on other switches, there are no audible "extra" noises, not even when pausing the music (from computer) and turning up to full volume. I'm happy. More to come

Location: Mexico city

Retired
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050

Great news! Way to hang in there.

John

Hi Søren,

 

Triumph!….. we are all celebrating vicariously with you…. and because of you and your “never give up” tenacious attitude. 🤒

 

Plus isn’t it fantastic to have friends like Jacques, Martin, and Frede helping you? Well of course it is. (If I left anyone out, it was unintentional.)

 

Bravo the team effort….. starting with Søren!  😁

 

Jeff

Location: Victoria, British Columbia

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beovox.png Beovox.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beogram-400x.png Beogram-400x.png

Getting there, running music from computer, through BL 5000 to Beovox 3702, now 2 hours playing without problems, will let it play for at least 2 hours more, until now nothing bad except for scratchy tape switch.

A beauty

 

Location: Mexico city

Retired
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050

Sure, now! After all that HARD work….. a beauty it is!

 

Jeff

Location: Victoria, British Columbia

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beovox.png Beovox.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beogram-400x.png Beogram-400x.png
Congratulations. Of course I want to hear your thoughts after listening with M70s.

Well done!

How's the labour hour calculations going?....  :-)

Martin

Dillen wrote:

Well done!

How's the labour hour calculations going?....  :-)

Martin

If you include the well earned Cubas and Tequila I dread to think!

Seriously well done on yet another great and meticulous job.  Frede will be proud of your efforts/achievement.  How do you think it sounds then? How does it compare with some of your other receivers?

Dave.

 

I'd love to to hear it! I'm always impressed by your work!

 

......
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