When anodizing aluminum, the only time you use caustic soda is when you have old pieces already anodized, you use the caustic soda to strip the surface down to raw alu, thereafter you anodize. What you get after inmersing in caustic soda is raw alu which wil oxidize, starting immediatly with contact to air, the oxide will give a "whiter" look

[quote user="Leslie"] [quote user="Steffen"]But -the solution for amateurs is...sodium hydroxide.[/quote] Steffen, does the polished aluminium stays bling bling when I use this caustic soda stuff. What's your exeperience? Never knew you have this soda in almost each household. [/quote] And how do you mix it ?

[quote user="bayerische"] "Rip her to shreds", Blondie. [/quote] Go Blondie Go

[quote user="Friedmett"]I got to know Dillen and his brilliant work on nearly all of the audio stuff. I also got my own thread on HIFI4all a Danish HIFI forum called old school B&O which basically describes my B&O experience from the time 2008 and still going. Its in Danish but here is the link:[/quote] I have been following Friedmett

Boys you are young and beautiful ( I'm only beautiful) so burn some midnight oil and get the job done. EVAN and TODD, next week I will have my, The gleaming B&O Volume XIII, The Sound of Perfection, thanks to, well you know, this nice guy from the land below the Northern See. Had to pay another guy for it And EVAN I bet, my BM 4000 will be up

Well done and thank you to your wife for a beautiful pic

[quote user="Cleviebaby"]My infection with Beofever reflects those diseases that lay dormant in the body for many years and only fully present themselves in all their virulence at a much later date - in my case 30 years later![/quote] Same here, bought my first in 1969, BG 1000, BM 900, BV 1000s, long gone. 2001/2 I bought BS 3000, BL 4000s

Thats the spirit, and we love pics, before and after

In that case its better to find someone to do the repair, the parts you will need you can get from Martin (Dillen) he provides a set of capasitors trimmers and lamps that fits, with clear instructions how to change it. If you cant solder or never soldered and dont know anything about electronics, dont start with the 901. If you let it play as it is

Welcome to the forum, most likely you may have bad capisitors and trimmers in the output stage, but also bad connections can cause this, as you I'm a happy amateur, here is what I did with my 901, Before starting changing anything check the 32 volt supply voltage and the no load current, how to should be on the diagram you found inside but take