Last summer I bought a old 1960's tube amplifier: the 'famous' Lafayette Bocama 224B from a nice guy living in Zwolle. When I was studying, the Bocama, in triode, became my first HIFI amplifier combined with a small 2-way system. It was the start of a long career in buying HIFI. Anayway, when I was visiting the seller in Zwolle, I checked the Bocama for being NOS. It was! I have taken some pictures for a more detailed look.
With an amplifier from early 1960's you know you have to replace all kind of electrolytics. Often these are leaking or not function at all any more. But the seller had it playing when he showed me the amp.
Firstly I have to replace the 40+40 uF/350V elco and the 40+20+20=20 uF elco. Looking around the internet I found no 40/40 uF elco's. Could I use the JJ 50/50 uF/500V elco ? We all know a tube rectifier doesn't like to much uF when starting up. It stresses the rectifier. So that's the question. Also I found a 40/20/20/20 uF/500V also from JJ. Also take note of the much higher voltage ratings of the JJ: 500V versus 350V original.
First I started with removing the DIY power connector which the owner before my put on the back of the amplifier. As seen on the pictures there needs to be mounted a strain relief with a new power cable. This is what I exactly did! Next part will be replacing those weird loudspeaker terminals from the 1960's, replacing them with banana's accepting terminals. But before doing this I discovered the fuseholder was notn correctly mounted: a counter nut was missing! So now I'm looking for a new fuseholder!