UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

'LIVEWIRE?' · 4th Dec 2017, 10:58 pm

Andrew, I'm sure you are aware that the OC170 is essentially the same transistor as the AF116. Mullard used a numbering system in the 60s/early 70s in which diodes were OA and Transistors were OC. This was replaced with the Pro-Electron Code in the 70s, in which AA were diodes, AC AF Transistors, AD Power Transistors, and AF RF Transistors (all Germanium of course. Whilst I have seen and repaired many radios with OC44/45/71/81,etc., I have never come across a commercially made radio with OC170/171s, although years ago I did use them in home-built sets.

4th Dec 2017, 10:58 pm	#2
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Siemens Turnier RK30 Andrew, I'm sure you are aware that the OC170 is essentially the same transistor as the AF116. Mullard used a numbering system in the 60s/early 70s in which diodes were OA and Transistors were OC. This was replaced with the Pro-Electron Code in the 70s, in which AA were diodes, AC AF Transistors, AD Power Transistors, and AF RF Transistors (all Germanium of course. Whilst I have seen and repaired many radios with OC44/45/71/81,etc., I have never come across a commercially made radio with OC170/171s, although years ago I did use them in home-built sets.