On 3 May 2021, at 22:04, Dave Voorhis via groups.io <voorhis@...> wrote:
On 3 May 2021, at 20:02, Andy Warner <andyw@...> wrote:
...
Any 577 owners out there got advice to share ?
My first 577 (a D1) was very dim ¡ª and it came with a spare CRT ¡ª but essentially worked for a while after I got it home. Then it suddenly went completely dark. Rapid onset blackness seemed unlikely to be CRT wear so I checked the Z-axis and sure enough, two transistors (I don¡¯t recall which) in that circuit had failed.
I thought there was a chance I might have made notes of the repair, and sure enough I did:
Q1234 151-0406-00 Transistor:PNP:TO-39 04713 ST1264 2N5401
Q1226 151-0347-00 Transistor:NPN:TO-92 04713 SPS7951 2N5551
