taha_never

tried the DI. it didn't solve this problem!

[quote name='Beer of the Bass' timestamp='1454143551' post='2966802']
If you plug the preamp output into an active DI and use the XLR output via an XLR-jack cable, that may work. It would at least allow you to identify whether this is an impedance issue.
[/quote] so the passive ones are not effective for my situation? i'm having a good deal on a fender mini DI right now!

does it make sense to use a DI between the pre and rumble's return? to balance things out?

[quote name='dincz' timestamp='1454086409' post='2966356']
It's probably time for a schematic and/or a tech.
[/quote] i don't have the schematics for it and the builder is out of my reach. i have to look for a tech. but thanks for helping me with pointing out the problem source. Cheers

[quote name='Bill Fitzmaurice' timestamp='1454085584' post='2966346']
Typically you want the output impedance of a line driver to be no more than 1/10 the impedance of the driven input.
[/quote]
that'd be the key. thanks a lot

yes Bill thanks for the consultation, it sounds ok into the amp's input but not into the power amp return.
thanks dincz for the input, yes that's an op-amp which were suspected by other chaps on another thread about it causing a lot of white noise.

so what is the solution to have a suitable output to drive the power amp on my rumble 60 (18k ohm return) without a problem?

i may prefer the FET over another valve, though there is enough room for a chandelier inside the housing!

thanks Beer of the Bass, here is a picture of what's going on inside. 12ax7 are the tubes. normal and brite inputs, gain, U-hi U-lo, bass, trbl and master are the controls.
[sharedmedia=core:attachments:201501]

thanks a lot now i have a picture of what's happening. search results too technical for a noob so i need you guys to confirm that i can ask a tech to reduce the output impedance on the pre?

when i plug my external preamp right into the effects return on my rumble 60 v.1 i lose a huge amount of highs even with the ultra Hi engaged on the pre. is it normal?
setup: passive P > tube preamp (i have no specs on this unit except it has a 1/4 mono output) > rumble 60's return.
cheers

[quote name='paulnb57' timestamp='1452067972' post='2945967']
Lets see if we are on the same Hymnsheet here..

You want a bass guitar with one pickup, one volume and one tone control and the pickup is a Jazz type?

The pickup has two wires?

If the answer to the above is yes, follow ANY single pickup wiring schematic.........like this one......


[url="http://www.seymourduncan.com/wp-content/uploads/2015/05/1S_1V_1T.jpg"]http://www.seymourdu...05/1S_1V_1T.jpg[/url]
[/quote] yes exactly that. thanks a lot paul! didn't know i can follow a guitar diagram. total noob here! i appreciate your help!

[quote name='paulnb57' timestamp='1452063438' post='2945945']
one lead to earth and one to the correct tab on the volume pot.....
[/quote] thanks p. i'm going to try that.

googled, searched and browsed forums, ... even contacted manufacturers, no response! found nothing on this single J.

[color=#282828][font=helvetica, arial, sans-serif]the wires coming out of the pickups are the important part of my question. where do they go?[/font][/color]

[quote name='EssentialTension' timestamp='1451934198' post='2944787']
Very good.
[/quote] Cheers !

[quote name='3below' timestamp='1451936259' post='2944816']
Hope this brings stability keep us informed on what happens.
[/quote] thanks 3below. sure. cheers

[color=#282828][font=helvetica, arial, sans-serif]bought some metal washers from our local hardware shop. inner:5.5 vs outer:10 millimeters. narrowed the outer to 9mm myself and they fit perfectly. bass is set up to a good action with no problem (at least for now). thanks again.[/font][/color]

[color=#282828][font=helvetica, arial, sans-serif]bought some metal washers from our local hardware shop. inner:5.5 vs outer:10 millimeters. narrowed the outer to 9mm myself and the fit perfectly. decided to just swap out the D string with the D string from the new set. the neck is currently set up very well to a much better action than before with zero problem. thanks again.[/font][/color]

i bought some metal washers from our local hardware shop. inner:5.5 vs outer:10 millimeters. narrowed the outer to 9mm myself and the fit perfectly. roger waters precision bass with vintage truss rod here (nut at neck heel).

Hello fellow BCers. i couldn't find any wiring diagram for a single J pickup configuration as one J neck pu, one volume and one tone controls. same as a common P config? can anyone help? thanks in advance.

yes Dave i'm going do that first. thanks a lot

just look at this!!

[quote name='ikay' timestamp='1450426417' post='2932590']
Hmm, try this one (and scroll down to the thread) - [url="http://www.fenderforum.com/forum.html?db=&topic_number=713534"]http://www.fenderfor...c_number=713534[/url]
[/quote] thanks man this worked and i read uncle's post. i wrote it down and will bring it to the hardware shop to see what's available. or maybe a washer close to that plus some mods on them. cheers

[quote name='chris_b' timestamp='1450429625' post='2932629']
YB, I can't think of anything that would be helpful.

Where are you based?

I know luthiers can use Loctite 222 Screwlock to keep screws in place, which might otherwise vibrate loose. It might stop your truss rod unwinding.

[url="http://www.amazon.co.uk/Loctite-Screwlock-Controlled-Torque-10ml/dp/B00M1UDU36"]http://www.amazon.co...l/dp/B00M1UDU36[/url]
[/quote] thanks chris. i'm in Iran. i may find something similar to that product. so you think i need to control the torque. but i think it's more of a wood squash problem because the nut goes deeper in its cave every time and it seems to be maxed out now! let me post a picture now

[quote name='EssentialTension' timestamp='1450249316' post='2930853']
are you suggesting MIM are not up to standard?
[/quote] i don't know. i'm asking this. as they are very cheaper than the vintage/USA ones i suspected that the tolerances and standards may vary so maybe i should not put a high tension string on a mexican neck. another thing to mention is that after a1.5 year of use (with 45-100 199LBs strings on) i'm facing a maxed out truss rod which means i have to put washers under it first (if that just fixes the problem) before putting the new strings on. bigger strings=bigger problems?!