UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

yagosaga · 20th Feb 2007, 9:57 am

Hi Darius,

this might be a silly question. In the 1970's I have build a small valve-based audio amplifier without output transformer for headphones. I used 18 V d.c. and a PCC88 as the audio triode. Do you think it is possible to update your triodelington in such a way that an output transformer is not necessary? I think with 12 or 24 V d.c. this should be possible. Perhaps you have to look for an other transistor. But in this update you can take the filament voltage direct from the 12 or 24 V d.c. source.

Kind regards,
Eckhard

20th Feb 2007, 9:57 am	#59
yagosaga Retired Dormant Member Join Date: Mar 2005 Location: Braunschweig, Germany Posts: 208	Re: making an audio output triode... Hi Darius, this might be a silly question. In the 1970's I have build a small valve-based audio amplifier without output transformer for headphones. I used 18 V d.c. and a PCC88 as the audio triode. Do you think it is possible to update your triodelington in such a way that an output transformer is not necessary? I think with 12 or 24 V d.c. this should be possible. Perhaps you have to look for an other transistor. But in this update you can take the filament voltage direct from the 12 or 24 V d.c. source. Kind regards, Eckhard