ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
My first post here so hello all. I could do with some advice - I've been repairing vintage synthesizers/guitar pedals & a few other bits (as a hobby) for about a year learning as i go with lots of reading & trial & error & I absolutely love it. I'd like to broaden things a bit & have started studying amp design a bit more. I am very ameture but do know a lot of the basics to get me through.
A guy I know has a Beomaster 3000 & would like it fixed & he says the the output fuses keep blowing, i don't have much more info than that really. I assume (as he is a hi-fi collector/enthusiast) that the speakers he is using are fine & nothing else obvious is the cause. I have the service manual/schematics & have read about the 'electronic fuses' which protect the output transistors < I am not sure how this part works?
Any ideas of where to start & what to look for in this amp regarding this problem - shorted output transistors... power supply shorts.. etc?
Or, perhaps, I should leave well alone altogether (as I am not that familiar with power amp stages) !?
Thanks in advance for any input anyone can give me.
Welcome to Beoworld !
Which type of Beomaster 3000 ?1970s with a lots of buttons and sliders or 1980s flush and smooth?
Martin
Thanks for the warm welcome. I don't know as i haven't actually seen it - he just says it's the 3000 so ill have to find out which version Is. How do the two amp circuits compare, many differences/complexities? & how does availability of replacement parts compare with the two?
I've read B&O stuff sometimes needs a bit of a different approach when servicing compared to a lot of other gear, not sure your thoughts on that?
Thanks kindly!
They are two completely different receivers.See here:http://www.beoworld.org/prod_details.asp?pid=336http://www.beoworld.org/prod_details.asp?pid=339
One has a discretely built amplifier, the other has a hybrid chip.Most parts are commonly available for both.It's true that servicing B&O in general is not like any other stereo but thte Beomaster 3000 (either version)is not the "worst" in this regard.