UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Sony-STR3800L. Output transistors.

samjmann · 23rd Jan 2023, 11:30 am

Thanks vidjoman. Around 5mA seems a reasonable current setting.
I've got a manual for a Sansui AU-919 which is a huge 100w twin transformer amp, this only sits at 30mA quiescent, so this 25W Sony must be way less than this.

Whilst I was working on it, a small trimmer cap which is on top of the tuning gang just fell apart. The FM oscillator is now way off but the calibration was nearly right before. It has '20' stamped on it so I assuming that's 20pF. I've ordered that and some near values and try to set it. I'm not touching anything else in the RF stages, it's easy to make things worse!

SJM.

23rd Jan 2023, 11:30 am	#9
samjmann Heptode Join Date: Feb 2014 Location: Nottingham, UK. Posts: 648	Re: Sony-STR3800L. Output transistors. Thanks vidjoman. Around 5mA seems a reasonable current setting. I've got a manual for a Sansui AU-919 which is a huge 100w twin transformer amp, this only sits at 30mA quiescent, so this 25W Sony must be way less than this. Whilst I was working on it, a small trimmer cap which is on top of the tuning gang just fell apart. The FM oscillator is now way off but the calibration was nearly right before. It has '20' stamped on it so I assuming that's 20pF. I've ordered that and some near values and try to set it. I'm not touching anything else in the RF stages, it's easy to make things worse! SJM. __________________ It's never been right since we've had it...