Need help finding schematics for K150-7 [message #14582] |
Thu, 21 October 2010 16:35 |
cassent5150
Messages: 341 Registered: August 2009
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Anyone out there have a clear copy of the schematics for a K150-7. I'm the proud owner of one that was setting in a junk heap somewhere and I intend on restoring this thing to life. Please e-mail me a copy at cassent5150@hotmail.com! I've gutted it, cleaned and shined the chassis, installed the transformers, rectifier bridge, power switch, output transistors and driver board (PC-5032), but there is a transistor missing on the driver board that I need to install. I need the PC-5032 schematic to find out what transistor to put in there so I can fire this puppy up and see if it will "BARK" Thanks in advance STEVE C
Steve C
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Re: Need help finding schematics for K150-7 [message #14590 is a reply to message #14587] |
Fri, 22 October 2010 15:50 |
cassent5150
Messages: 341 Registered: August 2009
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fantastic, I got all of them Thank You soooooo much C-bill and all you guys that sent them to me. I'll reply back to this message with my progress as a rookie teck. If anyone out there knows or has experiance with beefing up a K-100-7 by replacing the tranny, rectifier, caps and driver with that from a K200-1 I'm intrested to know how it worked. I got a friend that has a K100C-8 that, for reasons I'll never know, is bugging me to do it for him. I've been tossing the idea around and don't see why it wouldn't work with the voltages between the 703 and 900 driver boards being equal. Let me know if anyone has done this and how it turned out. Thanks Steve C
Steve C
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Re: Need help finding schematics for K150-7 [message #14601 is a reply to message #14583] |
Sat, 23 October 2010 20:49 |
cassent5150
Messages: 341 Registered: August 2009
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Fantastic copy of schematic PC-5032, many thanks!!!!! This copy has a transistor daigram on it, what a differance that makes for locating transistors, specialy the ones in the signal path. I pull the board out for ease of bench testing, all the caps checked out, all the diodes were good so I went to checking transistors and bingo. The second one in the signal path was open on the collector side so I replaced Q-2 reinstalled board and WOOF WOOF this baby sounds all growed up again. With that said, I went on to test the rest of the amp and it seems channel one with effects has a problem. When I turn off the trem/vib by the intensity knob it cuts the signal. Do you have any ideas on that?
Steve C
Steve C
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Re: Need help finding schematics for K150-7 [message #14603 is a reply to message #14602] |
Sat, 23 October 2010 22:52 |
cassent5150
Messages: 341 Registered: August 2009
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Thanks I'll try that. As it sets everything works fine until you turn off the trem/vib switch. I'll see if I got a pedal to operate this thing, any 2 button switch with a 3 conductor 1/4 inch stereo plug should work. Thanks Steve C
Steve C
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Re: Need help finding schematics for K150-7 [message #14614 is a reply to message #14582] |
Mon, 25 October 2010 13:46 |
chicagobill
Messages: 2005 Registered: April 2003
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Turning the intensity control full off with the switch is the same thing as using a foot switch, so I don't think that there will be any difference there.
How much of a signal loss is there? If it is dramatically lower, then there may be a problem with the fet bypass switch transistor Q1002 or capacitor C1009.
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Re: Need help finding schematics for K150-7 [message #14630 is a reply to message #14614] |
Mon, 25 October 2010 21:31 |
cassent5150
Messages: 341 Registered: August 2009
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Your right, with effect onI have good signal with no problems what so ever. Switch off effects and no, none, zip,notta, not a sound is audible. I was checking all the transistors for any possible short or I should say open curcuit, most of which still soldered in the board, and Q1002 was open on one leg. I have what I thought to be a replacement for the 2N5033, "I somehow crossed it to a 2N3994 but it has four legs instead of three "is that incorrect?". Seems to test backwards on the 2n3994 "using Drain as common (negitive) I get readings on both sourse and gate as positives. Not so on the 2n5033's in Q1003 and Q1004 positions. They test with readings "using Drain as common or positive and both source and gate as negitives. I believe I will just search for some exact 2N5033's and put that back in there. STEVE C
PS: Thanks for the help so far!!!!
Steve C
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Re: Need help finding schematics for K150-7 [message #14634 is a reply to message #14611] |
Tue, 26 October 2010 08:12 |
cassent5150
Messages: 341 Registered: August 2009
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Senior Member |
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I was thinking more on the lines of swapping everything from a K200 chassis to the guys K100C chassis "less the pre amp section of course". I'm going to save the info though just incase I get a wild hair to experiment later. Thanks Steve C
Steve C
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Re: Need help finding schematics for K150-7 [message #14636 is a reply to message #14635] |
Tue, 26 October 2010 09:16 |
cassent5150
Messages: 341 Registered: August 2009
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I wouldn't try driving them stock CTS's with a K200 head, but I'm sure with the right 10" speakers to handle that power it will still sound sweet. This is the thing. I sold this K100-8 to a friend of mine cause I had 2 of them and he loved how they sound. He heard the K200 a couple times and thought it has that same sweet sound and a whole lot more punch. He has a thing about power or something and has been on me ever since to do the swap. Yea, its a lot of work and yea, he'll have a real sleeper amp "as he calls it", but I was just cureous if anyone has done it and how it turned out,"MY GOD the little K100C is already plenty loud enough, but I guess thats just me". Steve C
Steve C
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Re: Need help finding schematics for K150-7 [message #14638 is a reply to message #14582] |
Tue, 26 October 2010 12:13 |
chicagobill
Messages: 2005 Registered: April 2003
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This thread is getting sidetracked all over the place.
To test the fet's, use the gate as the common connection, like the base on a bipolar transistor. You should get readings similar to a regular transistor, maybe .6 volts between the gate and the source and drain. The main difference is that there will be a low reading from source to drain. Fet's are always "on" instead of always "off" like a bipolar transistor.
Is the 2N3994 in a metal case? If it is, often the case is connected to one of the 4 leads as a shield.
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Re: Need help finding schematics for K150-7 [message #14640 is a reply to message #14637] |
Tue, 26 October 2010 21:40 |
cassent5150
Messages: 341 Registered: August 2009
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I think we are thinking along the same lines "Like, why go through all that trouble its bad to the bone just the way it is and if you like the K200 than go get one and be done, end of story", but here's the catch. I'm going to first assume your thinking this is already a head and cabinet combination so why bother, but its not. This is that little K100C-8 2X10 Combo "SC Series". Its shorter than that little K50 and just a little longer to fit those two tens and he wants more power without having to carry anything more than this little combo around. I totaly agree with you "What for, just carry a darn mike and cord in you back pocket and let the pa do the rest and leave well enough alone" Thanks Steve C
PS: Topic Has Two Threads and this is a reply to BEEFING UP A K100C-8.
Sorry if it seems to jump around.
Steve C
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Re: Need help finding schematics for K150-7 [message #14641 is a reply to message #14638] |
Tue, 26 October 2010 21:54 |
cassent5150
Messages: 341 Registered: August 2009
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Well, I have real problems now. I installed the NTE 336 which is suppose to be the same thing and, wham, I got some static sound at first then HUMMMMM and the power lite went to a glow. This was with the intensity switch turned off. Looks like I'm back to the begining and don't even know where to begin, so I'm done for tonight. Thanks ya'll and goodnight. Steve C
PS: Thanks C-bill for the great info, it will help out alot cause there's a few of these in here to check now.
Steve C
[Updated on: Tue, 26 October 2010 21:56] Report message to a moderator
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Re: Need help finding schematics for K150-7 [message #14642 is a reply to message #14582] |
Wed, 27 October 2010 07:31 |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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The NTE336 not the right part, its not a P channel FET, its just a NPN type.
You need a NTE326 which is the cross for the 2N5033.
Your friend needs to understand that there is no subsitute for more or bigger speakers in a quest for more volume and coverage area.
Two more 10" drivers will pretty much double that amps precived volume where as wattage wise you would have to go to 10 times that amps current power to get the same results.
It will be dam hard to find two 10" guitar drivers that can stand up to 500 watts RMS!
He needs the -8 type cabinet that house`s 4 10" drivers. The amp will weigh in at a mere 10 pounds more and then give him what he is looking for.
[Updated on: Wed, 27 October 2010 07:34] Report message to a moderator
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Re: Need help finding schematics for K150-7 [message #14644 is a reply to message #14642] |
Wed, 27 October 2010 11:28 |
cassent5150
Messages: 341 Registered: August 2009
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Senior Member |
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Thats pretty much how I look at it, thats why I haven't done it for him. I just put matched transistors and and fresh reconed speakers, "broke in of course", in that thing before I sold it to him and it sounded sweet. I restored it piece by piece as I found the parts and was so proud to see how nice it turned out. I hate to see it get butchered cause of his power trip so I'll share that copperhead speaker info with him. Question is, "what ohm, aren't the CTS speakers in there 16 ohm?", I dont recall.
Steve C
Steve C
[Updated on: Wed, 27 October 2010 11:33] Report message to a moderator
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