"spamtrap1888" wrote in message
...
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

What is the resonance of those speakers in that box? It should be no
higher than 40 Hz or so, or else the notes won't all play at the same
volume, right?



Get a grip, ffs. This is a cheap chinese combo with "Fender" written on
the front.


Gareth.