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Re: K 300 [message #19462 is a reply to message #18950] |
Sun, 29 September 2013 07:31 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4763 Registered: June 2004 Location: NY
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Senior Member |
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When you get the 12 volts supply source back up and stable try this check out / test.
You will need a lenght of 22 or 18 gauge wire and some red crimp type butt conectors and the tool to crimp them.
Once you have these go into the amp a cut the orange wire that feeds the driver / output board.
Cut this wire so you have enough lengh to work with to cut it yet again so you can get it back togethere when all is done.
Once you have this wire cut go to any of the 6 preamp boards and cut the brown main signal wire and butt splice this to the orange wire.
With this done you basically have a K150 OR k250 amp without the master E Q section and you should have good volume level out through the speaker, if not cut the purple wire on the preamp board. This wire feeds signal to the reverb drive section of that master board.
In this way you can also test all 6 preamp boards.
If this makes for good volume level than your signal load down problem lies in the reverb section and now we can help you out better hopefully.
[Updated on: Sun, 29 September 2013 07:44] Report message to a moderator
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Re: K 300 [message #19471 is a reply to message #18950] |
Mon, 30 September 2013 06:18 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4763 Registered: June 2004 Location: NY
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Senior Member |
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Yes thats due to the added gain the signal would have had if it ran thru the master section, now clip the purple wire and see if you get a large amount more volume?
[Updated on: Mon, 30 September 2013 06:19] Report message to a moderator
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Re: K 300 [message #19662 is a reply to message #18950] |
Sun, 24 November 2013 03:23 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
chicagobill
Messages: 2005 Registered: April 2003
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Senior Member |
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Have you checked the Zener diodes on the 5030 board as well as the filter caps for the 12 volts supplies? If the positive side is shorted, you will get zero volts on the output side of the big resistor and the resistor will get very hot.
As for the hum on the output, please check to see that there is no dc voltage on the speaker output jack. If there is, you have a power amp problem and can damage the speakers.
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Re: K 300 [message #19665 is a reply to message #18950] |
Sun, 24 November 2013 14:30 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
chicagobill
Messages: 2005 Registered: April 2003
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Senior Member |
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The diodes are polarized and the case should be marked with a stripe close to one end. The diodes connect to the circuit from the voltage supply line to ground.
On the positive side the stripe end should connect to the hot side and on the negative side the stripe end should go to ground.
Make sure that you test each of the diodes to be sure that they were not damaged.
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Re: K 300 [message #19672 is a reply to message #19669] |
Mon, 25 November 2013 16:02 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) |
mrg2u
Messages: 34 Registered: July 2013
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the Mesa is the model w/ just a volume and presence on the back, 12 tubes total though but the sound is incredible. at least now w/one success under my belt I will be more motivated as I know it can be done..LOL But i will sure let you know and, if any of you are on Facebook, send me a friend request . Just search my namr , Mark Gruici, and it will bring you to my page. thanks guys.
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