View Single Post
Old 4th Sep 2019, 11:26 am   #29
DonaldStott
Heptode
 
DonaldStott's Avatar
 
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 926
Default Re: Kolster-Brandes MR10

Some initial readings for the Valve pin voltages: -

Click image for larger version

Name:	KB-Pin voltages.JPG
Views:	42
Size:	60.1 KB
ID:	189489

All values seem to be on the low side even though the Rectifier is chucking out a healthy 184V D.C. As Mike (crackle) advised in Post #23 above "If you have not yet changed all the hunts capacitors then voltages will be down all over the radio due to excessive current being drawn on the HT."

Clearly something not quite right with the 12AT7 (V1) at the FM stage - but we'll tackle that in due course.

So several Hunts Mouldseals to replace and some cathode resistors to check.

I'll probably replace that big electrolytic as well C37, 2μF
__________________
BVWS Member
DonaldStott is offline   Reply With Quote