On Aug 1, 9:16*am, "N_Cook" wrote:
Robert Macy wrote in message
...
On Aug 1, 1:53 am, "N_Cook" wrote:
Bad input socket, is there a generic problem with these?
Of course I thought it was a PbF problem but it escaped that , leaded
solder
inside. Solder joints seem fine and no broken tag. Socket make not seen ,
not desoldered yet, maybe make underneath.
The jack centre line is off-centre of the socket centre line , the sleeve
contact is a barrel which is chromed and only makes contact with the now
tarnished ground contact if the metal bush nut is tight and the 4 pointed
grounding tangs are not bent and are making good contact with chassis
metal.
So 2 ways of loosing ground contact. With no bush nut the chromed barrel
will rotate a few degrees and then just touching contact to the socket
ground terminal .
Of course I have the preamp out of the chassis now and so do not know what
the initial state was other than the bush nut was not loose when received.
All compounded by gallons of WD40 squirted everywhere that has certainly
lost the tip and ring bypass contacts to ground with no jack inserted.
I can see repeated tightening/ overtightening? of the metal bush nut
plenty of spanner/wrench force can be applied as metal nut and metal bush)
will deform the 4 tangs/ dig deeper pits into the front panel metal, until
eventually no contact.
An aside , why 2x 10 inch speakers for a bass amp?
This is a guess, cheap way to add their phase and gain a larger air
surface without paying for it.
Like the old 4 x 4 array of 4 inch speakers called 'sweet sixtenn'
that had horrible resonances, but great bass.
++++
I was thinking more in terms of frequency response.
The fundamental f of 2x 10 inch speakers is still the fundamerntal f of one
speaker which AFAIK is always going to be higher than a 12 inch or 15 inch
speaker, whetever the make or efficiency etc
It is my understanding that...
speaker by itself has f
two speakers side by side has a lower f
Measure sound output, the two help each other, just as the 16 lower
the overall f of the speaker system