UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Radford SPA.50 guru required ;-)

Trevor · 20th Oct 2017, 7:17 pm

i have an sp50 or should i say sp60 in my collection it was purchased as a 50 but after opening it up i found it to be fitted with 2 x sp60 modules and a derated power supply
i corrected the supply and then found a channel to be noisy be aware the correct transistors for these are hard to obtain and are very expensive
however having said this the amplifier sounds very nice
you will need low distortion oscillator distortion analyser and a scope in order to fix this correctly
regards Trev

20th Oct 2017, 7:17 pm	#5
Trevor Octode Join Date: Aug 2006 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 1,082	Re: Radford SPA.50 guru required ;-) i have an sp50 or should i say sp60 in my collection it was purchased as a 50 but after opening it up i found it to be fitted with 2 x sp60 modules and a derated power supply i corrected the supply and then found a channel to be noisy be aware the correct transistors for these are hard to obtain and are very expensive however having said this the amplifier sounds very nice you will need low distortion oscillator distortion analyser and a scope in order to fix this correctly regards Trev