[Heathkit] SB-610 Questions

[carl lowry]

Mark,

I redo the SB-610s everyday.
Infact there are 8 of them in my workshop right now to be restored.
The 610s were manufactured by Heathkit between 1968 and 1972.
They are older than some of our recent Hams.. but many of us broke our teeth on Heathkit.
Every 610 i get in here i replace "all" the resistors and "all" the caps.
It takes me about 15 hours to undo & replace all the components.
When the Control Pots are stiff or frozen you've got to disassemble them & clean them up & relub.
The Selenium Rectifiers i replace with 1N4007 Diodes.
I have really not found any resistors or caps in the units to spec at what 
they originally were when first manufactured.
After all they are 35 years vintage. We all change after those many years.
The "lack" of trace wave width (TWW) can be contributed to the .05mfd cap going to pin 3 on Horizonal Gain Pot
which is a 1 megohm.
Also look at the Horizonal Position Pot circuit which has a .1mfd cap on pin 3.
Like one of the other guys mentioned "Look at the Intensity" circuit.
Also look at the Focus Pot next to it.
I would replace the 2 Caps and the 3 resistors (  330k & 3.3m )
If you need the Mouser Part Numbers please e-mail me & i will be glad to Fax you all the Mouser part numbers.
Good luck.
Carl.