In case of buying new one, will the available 60V caps be a good alternative in stead of the present 50V ones ?

Aad 

Aad Jansse wrote:

will the available 60V caps be a good alternative in stead of the present 50V ones

Will be ok.

I agree.
Though they are not reservoir capacitors but output series caps.

Martin

(Another filling up the gap in my knowledge, as I referred to in the first line of my first post of this  thread)

Aad

I am back at where I was at the beginning of this thread and even worse:

I finally acquired the necessary parts that had to replace the ( possibly) faulty ones. To make a long story short:  a headphone connected,  I had the nerve to press the P1 (preset  FM) key: For short a moment  “l’histoire se répète”, as the French say: only one channel came to life, then I switched it off.

Then I connected one small speaker in order to find out if either the left channel or the right one was the problem, powered the 1700 on again and there was a short hum and everything went dead, no smoke. Quite frustrating!   Unfortunately there are no fuses that can be blamed and I keep my fingers crossed when I am going to investigate the condition of the rare TE-darlingtons in the powerstage and subsequently check the other components.

Aad

Did you set the idle currents, before you connected speakers?

Martin

I hardly dare to confess: NO!!;  In my eagerness to hear the result of my work I forgot this and I am now punished by facing the situation that the result is dramatically negative!!

But, wise men used to say: all comes with experience ( learning by doing): Impatience is never a good argument for anything.

Is all lost now? Is there any hope that the TE-darlington IC's survived the shockwave?

Anyway I have to start from scratch with equivalent type transistors; e.g. the BD33/34?

• .
• How can one check the idle current when you are not sure if something might happen what just occurred just now.

Aad

You set the idle current with no speakers attached.
Start with the trimmers in center position and power the Beomaster up on a variac while monitoring the idle currents.

Martin

So I am going now on a quest to find someone with a variac. 
Meanwhile I would appreciate hearing an answer on my question about the use of the  BD33 and BD34 as substitutes for the now faulty TE 1088 and TE1089.

Aad