UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Fidelity Playmaster/Braemar Tape Recorder

Amraduk · 23rd Aug 2019, 9:39 pm

@ Edward

The volume control is between V1a and V1b (ECC83) and the Monitor O/P is taken from V1b anode, so the volume control will affect the Monitor O/P.

@ ricard

The information in the R+TV service book says: "Monitor output: 400mV at 2k." With a 10K load instead, the output will of course be higher, in this case, assuming that 20V at the anode of V1b is 20V (is that about right?), it will be about 1.8V. I would think that the loading on V1a would have been taken into account at the design stage.

Many thanks for every ones comments.

Regards,

Dave.

23rd Aug 2019, 9:39 pm	#5
Amraduk Hexode Join Date: Jan 2007 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 453	Re: Fidelity Playmaster/Braemar Tape Recorder @ Edward The volume control is between V1a and V1b (ECC83) and the Monitor O/P is taken from V1b anode, so the volume control will affect the Monitor O/P. @ ricard The information in the R+TV service book says: "Monitor output: 400mV at 2k." With a 10K load instead, the output will of course be higher, in this case, assuming that 20V at the anode of V1b is 20V (is that about right?), it will be about 1.8V. I would think that the loading on V1a would have been taken into account at the design stage. Many thanks for every ones comments. Regards, Dave.