Re: SP-1A noise on ssb

bill steffey NY9H

having been in the audio business for over 40 years... 20+ with JBL ... & then Renkus Heinz.. I'd say this is quite a nice little box.... a very early version  SP-1  the device inside was a TDA7391.....

my opinion exceeds BOSE ... for the purpose

bill ny9h

On 1/30/2020 1:15 PM, Klaus Brosche, DK3QN wrote:
@Vianney, with re. to Declans' post:

What type of audio amp is used in the SP-1A (and in the SP-1, I have the latter one but don't want to open
the housing just for this exercise)?

Is it one of these Class-D amp chips?

73, Klaus, DK3QN

Am 30.01.2020 um 19:06 schrieb Declan Mayock via Groups.Io:
I recently got a sp-1a and find it excellent but on usb/lsb there is an annoying whine/fizzle, its hard to explain but on a quiet part of band on filter 1 or 2 it sounds like it is picking up internal electrical noise from circuitry, it is only present when volume is turned on on duor even on volume 1, i have moved cables and separated etc but no joy has anyone else noticed this?

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