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update: NGD SG-1

Twangthang
August 14th, 2010, 10:28 PM
I posted a few days ago about how I found a Gibson SG-1 and posted some pictures. I finally got it home and the thing sounds awesome… but man is this thing strange!
We took off the old strings and started opening things up and instead of getting answers to a few questions we got a lot more questions… First is the control plate. (see pictures below). What I expected was to find the original pots labeled all nice, What I found was an original volume pot soldered over enough that the markings were unreadable. The tone pot was a replacement with 2 resistors, 2 caps and what looks like a small transformer (???). I have never seen that and would love to hear some input on what it might be for.
The other oddity is the pick up. The original mini humbucker is long gone, replaced with what I thought was an early 70’s embossed Gibson humbucker… What we found was what looks like an early 70’s embossed Gibson humbucker cover soldered to a Gibson Patent Applied For (PAF) humbucker… The pick up sounds very strong and I haven’t
taken a resistance reading. I suppose more investigation is in order.
The front of the guitar has a brown color and the back is red. The finish under the bridge is red. I am assuming the finish faded to brown, but that is really not an issue. It just adds to the odd character of this guitar.
The last thing is the bridge. In a word it is a mess but not so bad that the guitar doesn’t intonate… It was replaced with a bad ass bridge and the studs were sunk in a little crooked. I like the adjust-ability of the bridge but like with all the mods done on this thing…it is just a little bit off. I was worried I may have paid a bit more than it looks like it worth, I have seen them on Ebay for $900 in mint condition. It sounds really good and feels like an extension of my hand.
I think that most of these mods were done earlier in the guitar’s life. It plays and sounds great… It sure is not your mother’s idea of an SG… I paid $400 for it, but plays like a million!

Guitar_Ninja
August 14th, 2010, 10:58 PM
If I was to hazard a guess, I'd say the transformer indicates the guitar is wired up as a passive direct box to go straight into a mixing board.

Twangthang
August 14th, 2010, 11:38 PM
If I was to hazard a guess, I'd say the transformer indicates the guitar is wired up as a passive direct box to go straight into a mixing board.

My question is does the passive direct box affect the signal going into an amp?
I did a little reading about it and didn't get much more than a DI fattens the sound into the board.

Guitar_Ninja
August 14th, 2010, 11:55 PM
Yes, it converts the signal from a Hi-Z signal to a Lo-Z signal (high impedance to low impedance). A guitar pumps out a hi-z signal, and that's what an amp is expecting.

The lower the impedance of the signal, the lower the voltage of the signal, and you require a certain voltage to push the input stage of an amplifier.

A lo-z signal will sound very anemic and quiet going into an amp, especially a tube amp. Sending a low impedance signal into a high impedance input can also alter the frequency response of the pickup, making it sound odd through the amplifier.

Twangthang
August 15th, 2010, 12:20 AM
I have had it plugged into 3 tube amps. I don't think it is very anemic sounding. It is rattling the tubes in my Champ 12... I don't think I will really know about how the frequency response is effected until I clip out this DI circuit out.

bamarags2002
August 15th, 2010, 12:31 AM
That's beautiful... looks really great