Yammie TRB first series (Japan)

[geoffbyrne]

Can anyone point me in the direction of a circuit diagram/pictures of the original Yamaha TRB 5 string pre?

Ta.

G.

[Myke]

What's the issue you're having?

[geoffbyrne]

The original has been replaced. I'll be getting it soon & may wish to revert. Currently the solo'd pups are not humbucking - I was lead to believe there were dummy coils etc. Just need to know more, really.

G.

[ikay]

Can't find a service manual for the TRB series I but the TRB series II manual (with circuit diagram) can be found here:
[url="http://www.yamaha.com/yamahavgn/Documents/Guitars/TRB5II_5IIF_E.pdf"]http://www.yamaha.co...B5II_5IIF_E.pdf[/url]

TRB5P series I circuit diagramd and parts list can be found here:
[url="http://s55.photobucket.com/user/i2k92/media/schemo/cdtrb456p.jpg.html"]http://s55.photobuck...rb456p.jpg.html[/url]
[url="http://s55.photobucket.com/user/i2k92/media/schemo/cdtrb456pcmp.jpg.html"]http://s55.photobuck...56pcmp.jpg.html[/url]

This post on TB is about pickup wiring for the TRB 1005 and mentions a dummy coil. Not sure if this is relevant to the series I or your particular issue:
[url="http://www.talkbass.com/forum/f38/yamaha-trb-1005-aguilar-preamp-wiring-issues-572756/"]http://www.talkbass.com/forum/f38/yamaha-trb-1005-aguilar-preamp-wiring-issues-572756/[/url]

Realise none of this is what you really need but on the offchance it may be of some help.

Edited August 2, 2013 by ikay

[Myke]

Oh. Unfortunately this isn't an area of expertise for me so I can't really help out.

If you need photos I might be able to get some for you

[geoffbyrne]

Many thanks for the info & pointers to those who've replied.

Once I have the original, I'll decide what I'm going to do. I'm not sure if I should revert, as I've read the original pre was a bit noisey.

G.

[Myke]

[quote name='geoffbyrne' timestamp='1375523192' post='2162451']
Many thanks for the info & pointers to those who've replied.

Once I have the original, I'll decide what I'm going to do. I'm not sure if I should revert, as I've read the original pre was a bit noisey.

G.
[/quote]

Mine has a hum that is only heard when recording or going through a PA. Bit of a pain tbh.

[geoffbyrne]

Myke, do your pickups hum when solo'd?

G.

[ikay]

The pre on my series 1 is fine, maybe just a tiny bit of hiss when treble is fully boosted, otherwise quiet. Pickups definitely don't hum when solo'd. Only thing which is a bit of an acquired taste with the series 1 pre is the three position mid switch rather than a sweepable mid. I tend to leave it in the mid boost position and use the pickup blend to adjust how it sits in the mix.

[Myke]

No they don't. It hisses a little when the treble is boosted but that is all apart from the hum I mentioned before.

[Myke]

[quote name='ikay' timestamp='1375547312' post='2162794']
The pre on my series 1 is fine, maybe just a tiny bit of hiss when treble is fully boosted, otherwise quiet. Pickups definitely don't hum when solo'd. Only thing which is a bit of an acquired taste with the series 1 pre is the three position mid switch rather than a sweepable mid. I tend to leave it in the mid boost position and use the pickup blend to adjust how it sits in the mix.
[/quote]

I love the tone of mine when it's more bridge pickup with a slight bass boost

Completely OT though

[geoffbyrne]

Right. My pups hum a bit when solo'd. I'm assuming this is because they are not attached to the original pre. It's a Delano that's in it at he mo. I don't have issues with the tonality of it - it's fine, it's just the humming of the pups that's annoying me.

I *was* sitting just in front of the amp, tho' - rehearsal room.

G.

[geoffbyrne]

OK, I have the original pre & I wired it in, switched it on and ........ nothing.

Has anyone got a pic showing where everything is connected? Particularly what /how is connected to the black wire coming off the board just to the right of the volume pot?

G.

[ikay]

[quote name='geoffbyrne' timestamp='1385572341' post='2289815']
Has anyone got a pic showing where everything is connected?
[/quote]
Hi Geoff, some annotated pics of my TRB series-1 preamp below. Hope that's of some help. If anything needs clarifying drop me a pm.

[URL=http://s1090.photobucket.com/user/iankay/media/TRB%20PREAMP/IMG_1380.jpg.html][IMG]http://i1090.photobucket.com/albums/i370/iankay/TRB%20PREAMP/IMG_1380.jpg[/IMG][/URL]

[URL=http://s1090.photobucket.com/user/iankay/media/TRB%20PREAMP/IMG_1388.jpg.html][IMG]http://i1090.photobucket.com/albums/i370/iankay/TRB%20PREAMP/IMG_1388.jpg[/IMG][/URL]

[URL=http://s1090.photobucket.com/user/iankay/media/TRB%20PREAMP/IMG_1381.jpg.html][IMG]http://i1090.photobucket.com/albums/i370/iankay/TRB%20PREAMP/IMG_1381.jpg[/IMG][/URL]

[geoffbyrne]

Absolutely ace, Ian - many thanks.

G.

[geoffbyrne]

OK, I've made a mockup - black from board & earth leads fro pickups to ground.

It worked with the Red to Tip and White to Ring. My cavity(!) isn't shielded, so I have to take all earths to the socket pin.

Again, many thanks for the help. It looks like I'll get the Old Dear back to original spec, then I may put it up for sale.

G.

[geoffbyrne]

Success!!!!!



G.

[ikay]

Excellent!

[geoffbyrne]

Many thanks to you, Ian for the photos, and to Ou7shined for fixing the ribbon cable. Without both of you this wouldn't be working again.

Geoff.