"N_Cook" <
div...@tcp.co.uk> wrote in message
news:m3nrdt$ctq$1...@dont-email.me...
I hate these micro-controlled bollox amplifiers with a passion. DSP
'modelling' I can just about live with, but rotary encoders for controls ?
But even worse, normal pots, connected to A-D inputs on a micro ?Virtually
every one I see has a problem that's down to finger trouble ... Just a
couple of weeks ago, I had a Vox Valvetronix combo in that said "comes on
very quiet". Well that's because it's the way you set it before saving and
switching off, you moron. RTFM, or better yet, buy an amp with just a volume
and three tone controls on it.
I currently have a 4 x 6L6 Fender in for repair that has uP controlled bias,
FFS !! What a load of utter nonsense. What on earth was the designer
thinking of, or his supervisor when he approved it ? The micro is currently
doing absolutely nothing - not even any clock present, although the 3.3
volts is present on the chip. The bias is supposed to be controlled by four
PWM signals driving transistors, but of course, as there is no clock, these
drives are missing with the result that the output grids are all at -89
volts ...
The board that this lot is all on is utterly unrepairable, with SM
components the size of gnat's cocks. We're currently trying to persuade
Fender to tell us if this board is available even, let alone its price ...
>:-(
Arfa