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| Re: Metal Film Replacement Resistors [message #10518 is a reply to message #10515] |
Mon, 23 February 2009 11:13   |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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First off, welcome to the board.
I get them from Mouser in Texas. They have a great selection and ship same day, so for me I get orders from them in 2-3 days.
I know in another thread that you are looking for schematics for your amp, I saw the pre-amps posted over at ampage. Try searching there. If I get a chance, I'll try to post a link.
Again, Welcome!
Bill
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| Re: Metal Film Replacement Resistors [message #10523 is a reply to message #10521] |
Mon, 23 February 2009 12:00 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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No the tolerance does not matter as long as the basic value is correct. I would suggest starting with the pre-amp boards and then do the power amp board.
I was surprised at the difference that changing a few resistors and a few caps made in terms of the background noise and hiss levels. Even though you will notice a difference don't expect the amp to be dead silent.
For anyone that needs the schematics for the PC105 pre-amp board or the PC703 power amp board here's the link.
<a href="http://music-electronics-forum.com/showthread.php?t=11494" target="_blank"></a>
[Updated on: Mon, 23 February 2009 12:02] Report message to a moderator |
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| Re: Metal Film Replacement Resistors [message #10530 is a reply to message #10529] |
Mon, 23 February 2009 13:49 |
C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...
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Senior Member |
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Just make sure the voltage rating is the same or higher. I generally install caps that are 2 to 4 times larger. For a 2500uF I would put in 10,000uF. Typically in K100's. Or for 4700uF I would use 15,000 to 20,000uF. You might change the AGC3 fuse to a slow blow fuse. I generally don't change the bridge. That brige is very beefy as it is. But a 200VDC 25Amp bridge should be large enough.
Conrad
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| Re: Metal Film Replacement Resistors [message #10538 is a reply to message #10537] |
Tue, 24 February 2009 11:52 |
chicagobill
Messages: 2006
Registered: April 2003
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Senior Member |
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No, it isn't shown on the PC702 drawing. It appears on the overview page that shows the pre-amp boards and the power supply. It is listed as CR1.
On your amp, it is bolted to the floor of the chassis. It is 1 1/2" - 2" round (at least if it is the original one) and has 4 terminals with 2 wires that come from the power transformer and a red (+) and green (-) wire that go to the large filter caps.
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| Re: Metal Film Replacement Resistors [message #10635 is a reply to message #10515] |
Fri, 13 March 2009 22:51 |
pleat
Messages: 1454
Registered: June 2004
Location: Belding, Mi
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Senior Member |
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If it's any help, I have a bridge rectifier from a Kustom 3 monitor amp circa 1975 era. It is a little smaller in size but has the 4 tabs on it for hooking up the leads. 20.00 I looked on the schematic and it shows the power amp using 40.2 volts and I know the older K200 series shows 39.5 volts. Not sure if there would be a problem or if there is something else in the amps that regulates the proper voltage. The Monitor is a donor amp, Tranny is now in my K150 2x10 amp and the power amp board and transistors found a home in NC.
pleat
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