Harlie Tone Selector

Harlie Tone Selector
Fitted in a moment. Simply connect between your set and speaker, then turn knob and hear the tone change. Brings your speaker under complete control. Consumes no current, Lasts indefinitely.
The Harlie Tone Selector definitely improves reproduction from every type of set and loudspeaker. It gives you the choice of five different tones. It reduces undesirable noises. It eliminates needle scratch when a gramophone pick-up is used. It is the vital link which enables you to balance your set with your speaker. To prove our claim that you will be delighted by the improvement in your radio or gramophone reproduction, we offer you a Harlie Tone Selector on Seven Days Free Trial and guarantee to refund your money. in full if you are not more than satisfied. Thousands of Harlie Tone Selectors are now in use. Thousands of unsolicited testimonials have been received. Users say : " Worth its weight in gold." " Reproduction is perfect," " Depth and beauty of tone makes listening a real pleasure," " Imparts a wonderful clearness to speech," "The difference is unbelievable," " What used to be the noisiest foreigner now comes through as clear and noise free as the local station," "'Eliminates all surface noise dud needle scratch,"" Makes old and scratched records into new ones," etc., etc. (Originals may be seen.), You will be equally delighted. Get your Hartle Tone Selector today.
 

Here you find 8 models, 6 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Harlie Bros.Ltd., London