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Schematic vs. Actual [message #10542] Wed, 25 February 2009 10:26   77Pbass Messages: 18 Registered: February 2009 Junior Member I created a component list for PC105 Form K1012 REV.3, 12-69 Listed below. When I look at the board in my amp, I clearly see 3 33K resistors but they are not on the component list. They appear original however, other resistors look to be replacement metal film resistors (see photo). How reliable are the schematics? Should I just try and replace what is on the biard? Photo here: http://picasaweb.google.com/77Pbass/KustomK200B102#530503727 0827940978 Component List: Kustom PC105 Pre-Amp Compnent List Based on Form K1012 REV.3,12-69 Type Number Value Tolerance Capacitor C100 .1(?) Capacitor C101 47PF Capacitor C102 130PF Capacitor C103 33 Capacitor C104 33 Capacitor C105 0.022 Capacitor C106 0.001 Capacitor C107 10 Capacitor C108 0.22 Capacitor C109 0.22 Capacitor C110 0.022 Capacitor C112 47PF Capacitor C113 33 Capacitor C113 10 Capacitor C114 1(?) Transistor Q101 2N3638(?) Resistor R100 49.9K 1% Resistor R101 49.9K 1% Resistor R102 47.5 1% .5W Resistor R103 10K 1% .5W Resistor R104 15K 10% .5W Resistor R105 2.2K 10% .5W Resistor R106 2.2K 10% .5W Resistor R107 15K 10% .5W Resistor R108 10K 10% .5W Resistor R109 10K 10% .5W Resistor R110 4.7K 10% .5W Resistor R111 1.5K 10% .5W Resistor R112 220 10% .5W Resistor R113 10K 10% .5W Resistor R114 10K 10% .5W Resistor R115 10K 10% .5W Resistor R116 1.5K 10% .5W Resistor R117 1.5K 10% .5W Resistor R118 2.2K 10% .5W Resistor R119 10K 10% .5W Resistor R120 3.3K 10% .5W Resistor R121 10K 10% .5W Resistor R122 47(?) 10% .5W Resistor R123 1K 10% .5W Resistor R124 2.2K 10% .5W All Resistors are .5W 10% Unless Noted Capacitor Values are in Microfarads unless noted All Transistors are PET8002 or SE4002 Unless Noted Report message to a moderator

Re: Schematic vs. Actual [message #10551 is a reply to message #10542] Wed, 25 February 2009 12:43   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Just replace with the same values that you find. Report message to a moderator

Re: Schematic vs. Actual [message #10553 is a reply to message #10542] Wed, 25 February 2009 12:52 chicagobill Messages: 2005 Registered: April 2003 Senior Member Which pre-amp board are you looking at? My browser is too old to get to see the blowups of your photos. Your amp a K200B-1 will have two different pre-amp boards. One is what is considered the "normal" channel which is the PC105 board. The second channel is the "bright" channel which is the PC203 board. The PC203 board has (I think) two additional transistors and a handful of additional parts. Are you looking at the wrong board? As for the differences from board to schematic, there will always be few differences, based upon circuit updates, etc. The schematic that you have may or may not be the version that your amp was built to. Most of the schematics will be marked with the changes that have been made. Kustom marked theirs with small numbers next to the parts that had been changed. If the amp is working, and you are just replacing parts to see if you can reduce the noise levels, I suggest just using the values that you have and don't worry so much about matching the schematic. Report message to a moderator

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