Mac SE/30 pincushioning and flicker

Ian Finder ian.finder at
Sat Apr 2 11:28:45 CDT 2016

The flicker is gonna likely be aging capacitors on the analog board. Ideally you'd replace these.
For the pincushion I believe there are magnets on the yoke that can be adjusted...

Sent from Outlook for iPhone

On Sat, Apr 2, 2016 at 2:51 AM -0700, "David Griffith" <dave at> wrote:

I recapped a Mac SE/30 a few months back and only just now put it back 
together.  After a false start with dirty contacts on the ROM simm and 
resulting irregular vertical bars, the machine is working again.  There 
are no more zipping sounds coming out of the speaker.  Two problems 

1) There is slight pincushioning along the bottom of the CRT, about a 
third of the way in from the left.

2) The CRT produces a rather noticable and irritating flicker.  I don't 
remember the one-piece Macs flickering like this.

I think a cleverly-placed magnet might fix the pincushioning and recapping 
the analogue board would remedy the flicker.  Can I get some thoughts, 
commentary, and suggestions on this?

David Griffith
dave at

A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

More information about the cctech mailing list