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Kustom IV Lead Guitar Amp Head need schematic! [message #4595] Sat, 31 July 2004 15:59   Roll Messages: 2 Registered: July 2004 Junior Member Hi, Does anyone have schematics for this head "Kustom IV Lead Guitar Amp Head"? Thanks in advance, Roland (Luxembourg-Europe) Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #4605 is a reply to message #4595] Mon, 02 August 2004 07:24   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Log on to brodway music, they have it. Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #4610 is a reply to message #4605] Mon, 02 August 2004 16:46   Roll Messages: 2 Registered: July 2004 Junior Member Thanx for answering stevem, but i only want to know the right type of the first Transistor (first Trans. in the Input stage) of the second channel. The Transistor is coded as "S35677" "409" I live in Europe so the way to get a schematic is not simple as to get it from the States. Roll Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #4618 is a reply to message #4610] Tue, 03 August 2004 21:33 VinceG2 Messages: 26 Registered: April 2004 Junior Member Roll wrote on Mon, 02 August 2004 13:46 Thanx for answering stevem, but i only want to know the right type of the first Transistor (first Trans. in the Input stage) of the second channel. The Transistor is coded as "S35677" "409" I live in Europe so the way to get a schematic is not simple as to get it from the States. Roll I checked "S35677" with NTE and nothing showed up. However, "35677" shows up as the following: Industry Number : 35677 NTE Device Number: NTE102A T-PNP,GERMANIUM AF PREAMP,DRIVER,TO-1 I also checked 2SC409, but that shows this: Industry Number : 2SC409 NTE Device Number: NTE163A T-NPN,SI-HORIZ DEFL OUTPUT,TO-3 So I doubt it's a 2SC409, but may very well match the NTE102A transistor since it's a audio preamp driver. You can compare your transistor to the NTE info here: http://www.nteinc.com/specs/100to199/pdf/nte102a.pdf Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #4636 is a reply to message #4618] Thu, 05 August 2004 10:38 chicagobill Messages: 2005 Registered: April 2003 Senior Member Roll: What I would suggest you to do, is to look for another working transistor of the same number in another section of the amp. If there is one, use it to determine what type NPN or PNP and go from there. Bill Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7728 is a reply to message #4636] Sat, 14 October 2006 22:44   kfc333 Messages: 4 Registered: October 2006 Location: Branson, MO Junior Member I know it's 2 years after the last post, but I have the same transistor that appears shorted. This one is connected to the reverb tank's output (on a K250-4). According to the schematic I have, it's an NPN transistor, so if the NTE-102 is a PNP, then it is not a replacement. So if anyone now knows what this transistor really is, then I would appreciate hearing from you! Keith KFC Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7730 is a reply to message #4595] Mon, 16 October 2006 07:23   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Hi,the transistor on the output side of the reverb in a k150 metal face and k250 is a NPN type, kustom part number 007-0007-00 which is a TO92 type like commom 2n3904, nte type NTE123AP. The transistors original number was 2 diffferent forms(1)pte8004 or(2)se4000. Hope this helps! Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7731 is a reply to message #4595] Mon, 16 October 2006 07:24   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Sorry typing too fast.(2)SE4002. Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7732 is a reply to message #4595] Mon, 16 October 2006 07:27   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member A 2n3567 crosses to the 2n3904 also. Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7733 is a reply to message #4595] Mon, 16 October 2006 07:30   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Sorry one more time. A k250 or IV lead model would not have any germainium type`s in it. Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7735 is a reply to message #7733] Mon, 16 October 2006 08:58   kfc333 Messages: 4 Registered: October 2006 Location: Branson, MO Junior Member Hi, Yes, you've been a tremendous help!!!!! The reverb not working is the only issue with the amp and it has frustrated me. I will get me hands on some of these transistors and see what happens. Thanks again! Keith KFC Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7738 is a reply to message #4595] Mon, 16 October 2006 13:03   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Is the reverb tank itself ok?Do you read about 26 ohms on the in side of the tank, and about 182 ohms on the out side? Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7739 is a reply to message #4595] Mon, 16 October 2006 13:10   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Oh! while you are in there, if the power and polarity switches are still ok, then do this mod.These have a habit of breaking at the body from being pushed to hard, so with some cable ties go around each side of the switches braket to absorb the force of being pushed, this precaution is also the way I fixed mine if yours happen to be broke.Rplacement switches that will fit can not be found, the only way you can get them here is from another amp.Treat them gentle as they get quite brittle with age. Report message to a moderator

Re: Kustom IV Lead Guitar Amp Head need schematic! [message #7741 is a reply to message #7739] Mon, 16 October 2006 13:27   kfc333 Messages: 4 Registered: October 2006 Location: Branson, MO Junior Member Hi, Yes, the reverb tank is fine. I had checked resistances of both transducer coils and all was fine, plus I tried it in another Kustom and it worked fine. I get a strong signal out of the PCB jack that goes to the tank's input, but when injecting a signal into the "receive" jack on the PCB, the sound is barely audible and it's all distorted. Plus, both the collector and emitter of the "receive" side transistor measure around -0.62 volts. That gives me a good clue that the transistor is shorted from collector to emitter. As for the switches, great idea!!! While I never had one fail in the many, many years of using a K250 (I care for my amps like they are a baby), I will do what you suggest anyhow. Can't be too safe! Again, thanks for the help. Keith KFC Report message to a moderator

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