UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Beocord 5000 (Type 4715) Capstan Motor Speed

Krolroger · 8th Jun 2022, 11:51 am

Thanks for that.

TR2 collector should be approx -10V in Stop and -6V in Play mode.

I have the -10V but it's at -0.65V in Play.

As you point out, this suggests that TR2 is turned on fully to sink the motor current.

I could run the motor directly off the supply by removing the rectifier and bridging the two ac terminals with a 2R2 resistor but as it's maxxing out already, I'm not sure what it would prove except that it's drawing too much current.

8th Jun 2022, 11:51 am	#19
Krolroger Pentode Join Date: Nov 2017 Location: London, UK. Posts: 108	Re: Beocord 5000 (Type 4715) Capstan Motor Speed Thanks for that. TR2 collector should be approx -10V in Stop and -6V in Play mode. I have the -10V but it's at -0.65V in Play. As you point out, this suggests that TR2 is turned on fully to sink the motor current. I could run the motor directly off the supply by removing the rectifier and bridging the two ac terminals with a 2R2 resistor but as it's maxxing out already, I'm not sure what it would prove except that it's drawing too much current.