Author Topic: concert bass internal photo? (Help!!!)  (Read 3961 times)

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Offline fatlizzard

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concert bass internal photo? (Help!!!)
« on: June 19, 2009, 01:17:08 pm »
I have a 77 concert bass amp that has been making a crackling noise, if you hit the top of the head it goes away for a little while, I was told the connectors between the power and pre-amp are probably dirty or loose, I opened the amp and pulled and cleaned the connectors The red wire and the white/blue striped wire, problem is I'm not sure if I got them back on the right connectors and I don't want to turn the amp on until I'm sure,I feel embarassed by such a stupid mistake but I just wasnt paying attention when I pulled them off!!! Does anyone have a photo of the inside of a concert amp or can just tell me which posts are the correct ones? I believe they go on the second and third post from the corner one with the red wire that is going to what appears to be one of the two large grey capacitors!!

Offline fatlizzard

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Re: concert bass internal photo? (Help!!!)
« Reply #1 on: June 19, 2009, 03:00:22 pm »
Help!!!!!!!!!!!!!!!
I need to use this amp tomorrow.

Offline loudthud

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Re: concert bass internal photo? (Help!!!)
« Reply #2 on: June 19, 2009, 03:14:48 pm »
See if the layout diagrams in this thread: http://sunn.ampage.org/sdp/index.php/topic,4515.0.html

looks like the board in your amp. Can you read a pin number in the layout?

Offline fatlizzard

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Re: concert bass internal photo? (Help!!!)
« Reply #3 on: June 19, 2009, 07:24:01 pm »
The boards seem different,mine is a 77 black face red knob model. I am putting up photos and highlighting the connections in question I know the ones on the pre-amp board are right, just not sure of the ones on the power amp board!!!!!!






Offline loudthud

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Re: concert bass internal photo? (Help!!!)
« Reply #4 on: June 20, 2009, 12:13:13 am »
Sorry, I don't have any info on that board set or an amp of that vintage.

Offline fatlizzard

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Re: concert bass internal photo? (Help!!!)
« Reply #5 on: June 20, 2009, 08:57:43 am »
Anyone have one of these amps,can look inside and tell me if these connections are right?
Thanks !!!

Offline fatlizzard

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Re: concert bass internal photo? (Help!!!)
« Reply #6 on: June 20, 2009, 11:45:23 am »
Got desperate as I need this amp tonight so thought I would go ahead and power it up!
Works !!!!!!!!!!!!!!!!!!!!!!!!!
Crackling noise is gone as well  :-D