BT oscillator 87F/amplifier 109G - UK Vintage Radio Repair and Restoration Discussion Forum

oldmoley1 · 9th Nov 2014, 12:30 pm

Just acquired a complete BT tone set, including spare cables and a pair of headphones. A quick question - to avoid driving myself barmy or getting tinnitus as a result of using the headphones, is there an external sounder available that can be plugged into the socket in their place? If not, what would be involved in making one up?

space charge · 29th Nov 2014, 7:16 pm

the tone in the headphones is generally loud enough to be heard some distance.
the sensitivity / volume control on the amplifier control the volume.
the headphone plug actually switches on the amp when inserted.regards ei7ka

9th Nov 2014, 12:30 pm	#1
oldmoley1 Tetrode Join Date: Apr 2014 Location: Northampton, Northants, UK. Posts: 84	BT oscillator 87F/amplifier 109G Just acquired a complete BT tone set, including spare cables and a pair of headphones. A quick question - to avoid driving myself barmy or getting tinnitus as a result of using the headphones, is there an external sounder available that can be plugged into the socket in their place? If not, what would be involved in making one up?

29th Nov 2014, 7:16 pm	#2
space charge Tetrode Join Date: May 2013 Location: Enniscorthy, County Wexford, Ireland. Posts: 74	Re: BT oscillator 87F/amplifier 109G the tone in the headphones is generally loud enough to be heard some distance. the sensitivity / volume control on the amplifier control the volume. the headphone plug actually switches on the amp when inserted.regards ei7ka