Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: Dynaco ST-70 - is it better to keep it 'orginal' (unmodified)? posted by mikeyb on December 16, 2004 at 10:58:28:
Reflow every solder joint on the PCB, this will fix the intermittent connection 99 % of the time. Take special care to resolder around the eyelets - Most Dynakits were soldered by amateurs and cold solder joints are very common. The socket connections to the PCB also sometimes work loose from thermal cycling.I used to look for the problem visually, but resoldering is far quicker.
If that doesn't do it, carefully tap with a pencil eraser. Hairline cracks in resistors or capacitors make up most of the rest of the problems you'll find.
Change out the coupling caps, rebuild the bias supply - both for safety.
Schematic for this (and all Dynaco vintage tube gear) is on my website below if you need it.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Reflow the PCB - Gary Kaufman 12/16/0411:45:52 12/16/04 (0)