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

kalee20 · 18th Apr 2018, 12:41 pm

I'd agree a weak hum is all that could be expected. The UL84 is fairly sensitive as an output valve, but even so, it needs a few volts of audio for any sort of volume.

The voltage readings all sound reasonable.

Can you feed in some audio from something else - a battery-powered CD player, radio, MP3 player - from its headphone output? You can listen to see if it sounds distorted or not. If OK, then I'd question the cartridge, the volume control, or maybe the leads between cartridge and amplifier.

18th Apr 2018, 12:41 pm	#16
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,087	Re: Amplifier problem (record player) I'd agree a weak hum is all that could be expected. The UL84 is fairly sensitive as an output valve, but even so, it needs a few volts of audio for any sort of volume. The voltage readings all sound reasonable. Can you feed in some audio from something else - a battery-powered CD player, radio, MP3 player - from its headphone output? You can listen to see if it sounds distorted or not. If OK, then I'd question the cartridge, the volume control, or maybe the leads between cartridge and amplifier.