[chartz]

They can’t go bad but resistors and caps may change values and re-alignment required anyway, even when the device has never been touched. Sometimes especially if the tuner was never revised!

Some tuners never get misaligned though, and that’s impressive. I have a Beomaster 5000 (1967) that still has its original components and settings and it works perfectly.

I bought two FM3’s of the same period, one had its IF completely out and the other was still perfectly aligned. That’s pretty unpredictable.

Now some designs rely more on trimpots than others.

[chartz]

Radio alignment is difficult and requires a lot of experience, even with the proper tools.

I for one won’t touch it with a barge pole ☺️

The only thing I do is the adjustment of 19 kHz frequency.

[chartz]

And I might add that if the thermal fuse melted, you have to find the cause of that on the main board.
A shorted cap, diode… investigate. Something I still love doing, even though my abilities decline little by little. Enjoy.

[chartz]

Hi,

Thanks.

I do remember Craig’s job. The 4400 is all chipwood though.

The tricky part will be to cut it on the edges of the plastic trims.
I intended to glue the raw veneer to the plastic and cut it along afterwards.

I also have a Beomaster 8000 to do, one found in a scrapyard that I saved and which actually works. So if that works I’ll do it too.

[chartz]

Thanks John. What do you use then?

[chartz]

Beomaster plastic trims veneering

[chartz]

Hi,

Usual stuff… done ?

This 1900 type 2903 is not the most cleanly executed, as regards PCB. Lots of solders still had a lot of flux around. The later 1900-2 was much cleaner. Looks original too. Someone had indeed been there before but wasn’t up to fixing it (as usual, touch panel not correctly mounted, etc).

 

Now looking for someone to veneer the trims. The previous owner just removed it from the front, advertising it as mint ?

Unless someone here has new or mint ones, that is!

Martin, how come you haven’t come up with a re-veneering service yet? ?

Edit: is that why there are so many white ones? ?

Jacques

[chartz]

Chances are that the transformer’s thermal fuse has had it. Do test that first.

Maybe the board is still good.

[chartz]

Ha ha! ?

[chartz]

Hi,

Can’t you repair the one you have? It isn’t rocket science!

[chartz]

Hi,

Yes to all! Except for 5 ☺️

Even 2.2 µF will do.

[chartz]

Remember guys when we posted all those repair threads back in the day?

Have people just lost interest?

[chartz]

Thanks ?

[chartz]

I cracked it – TR25 was bad after all, but is still fine on the bench, statically. I had it in the drawer, a BC172B.

Good on the tester then but bad under pressure. I just shorted EC and found out the Beomaster switched off doing that.
I hate that kind of fault! A transistor is dead but it wants to live when tested with low voltage…

The BM1900 now switches off normally, and as suspected IC6 is good (it measured so).

Thanks for looking.

Jacques

[chartz]

Wow!
Who else than our very own Martin could come up with these?

Gorgeous, well done once again ??

[chartz]

That’s right. But the new forum allows about everything you might want to do anyway. The only – and very useful – interest of the app was to be able to take a photo directly for insertion in your posts.

[chartz]

True. The Beolab 8000 and the pizza boxes are a joy to use and behold.

[chartz]

I agree: don’t bother and just enjoy pressing the start button of a nice 1700 or 5000. Or of course a 4000…

[chartz]

None can be remote controlled by B&O modern equipment. Try to find a nice mint Beogram 1700 of 5000. But you’ll need a phono preamp.

[chartz]

Hi Alf. ☺️

PM sent.

[Author]

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