UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Kolster-Brandes MR10

crackle · 6th Oct 2019, 10:09 pm

You may find it easier to mount a bridge rectifier, for instance one with a hole for mounting direct to the chassis, rather than 4 separate diodes. (bit of an overkill on current wise but that wont do any harm. https://uk.rs-online.com/web/p/bridg...fiers/1656141/)
It is quite possible that the selenium rectifier is not performing correctly, but I have not had to replace one of these in a KB set yet.
The questions I would be asking my self now are;
Can anything else be pulling the voltage down?
Have I replaced all of the paper capacitors including all the crumbling hunts and any of those little double ended bullet shaped ones? (they look similar to resistors and normally seem to be 1nF brown black red, I cant remember if there are any in this radio)
Is V5 cathode resistor correct, and the cathode/grid voltage correct?

Mike

6th Oct 2019, 10:09 pm	#85
crackle Rest in Peace Join Date: Mar 2011 Location: Basildon, Essex, UK. Posts: 4,100	Re: Kolster-Brandes MR10 You may find it easier to mount a bridge rectifier, for instance one with a hole for mounting direct to the chassis, rather than 4 separate diodes. (bit of an overkill on current wise but that wont do any harm. https://uk.rs-online.com/web/p/bridg...fiers/1656141/) It is quite possible that the selenium rectifier is not performing correctly, but I have not had to replace one of these in a KB set yet. The questions I would be asking my self now are; Can anything else be pulling the voltage down? Have I replaced all of the paper capacitors including all the crumbling hunts and any of those little double ended bullet shaped ones? (they look similar to resistors and normally seem to be 1nF brown black red, I cant remember if there are any in this radio) Is V5 cathode resistor correct, and the cathode/grid voltage correct? Mike Last edited by crackle; 6th Oct 2019 at 10:19 pm.