UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Transistor types in Bi-Pak AL60 modules?

Biggles · 23rd Mar 2014, 1:51 am

The small disc ceramic across the input (at the bottom right of the board is marked 470M (470pF?)
The small disc ceramic between the RHS power transistor and the temp sens is 3900 (3.9nF)
The large square ceramic just above the first PNP to the left bottom of the board is marked M47 (470nF?) and the small square ceramic towards the mid right of the board is marked 22p (22pF). The first transistor (input) after the 22micro cap is a PNP. I was thinking this is strange but the cap is polarised correctly for that and the amp uses a split supply so it will be right. The poly cap under the temp sens transistor is 47nF.
Alan.

23rd Mar 2014, 1:51 am	#12
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Transistor types in Bi-Pak AL60 modules? The small disc ceramic across the input (at the bottom right of the board is marked 470M (470pF?) The small disc ceramic between the RHS power transistor and the temp sens is 3900 (3.9nF) The large square ceramic just above the first PNP to the left bottom of the board is marked M47 (470nF?) and the small square ceramic towards the mid right of the board is marked 22p (22pF). The first transistor (input) after the 22micro cap is a PNP. I was thinking this is strange but the cap is polarised correctly for that and the amp uses a split supply so it will be right. The poly cap under the temp sens transistor is 47nF. Alan.