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SF Twin Reverb odd noise
I have been working on a friends SF Twin,all seemed well until it went home.The owner said it still has tube noise.He brought it back to have new Power Tubes...
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BOSS GE7 problem on shut off
The pedal functions fine when on, either with battery or power supply,but when I shut it off it does a slow distorted fadeout and no signal passes through...
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Classic 50 OT replacement
I am looking for a replacement OT for a Peavey Classic 50,Any suggestions? By the way how does one get 50 watts out of 4/EL84s I thought 30wts was pushing...
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Steve,it's about time this came up.I dabble in RC airplanes and rechargeable batteries are the hot fuel source.I have some 9.6v 3800mh NiMh battery packs...
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Lets not forget dirt.I am always amazed when someone raves about how I improved their amp when all i've done is make a simple repair and give it a thorough...
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Why Do I Do This?-Classic 30 problem
A regular customer brings me a Classic 30 combo-"One of the output tubes is glowing red,must be a bias thing" he says.So I swap tubes around and...
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By shut down I mean all lights go out no sign of life.There is a transition of distorted sound followed by a volume fade to silence.Before this happens the...
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Ampeg PortaBass 250
This amp has taken a fall and now it shuts down after about 5 mins,turn it off and the same thing happens.Other guys have had no luck and I see a few replaced...
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I reassembled the amp today,plugged in to a light bulb limiter and all seems ok.Thanks Enzo,I have been struggling lately with some health issues and haven't...
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I checked the 4558 IC and that is where the short is.I replaced it(I have a dead PA amp loaded with them) and the short is gone.I hope to get to a power on...
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I tested the cap in circuit and found a short,removed the cap and tested it with an IT28 tester and an Atlas ESR meter and it tested ok.Out of circuit I measured...
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Thanks Enzo,I will give that a try tonite or tomorrow.I have a LB limiter.I was worried about the OT,so I measured the primary resistance-one side is 75 ohms...
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The resistors are R61 and R62.Its a 27v supply.Sorry my touchpad acts quite nuerotic and the cursor twitches all over the place.
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Peavey Classic 50 2x12 mishap
I had added adjustable bias and was testing with the transformer shunt method when my probe slipped and caused a short.The result is the 2-22ohm resistors...
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Mesa DC3 strange noise
I've noticed my DC3 has a faint crackling sound when warmed up.I checked to make sure the power tubes were seated properly and when I touch the tube retainer...
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I took some measurements after installing 1ohm resistors-Plates 420v,Screens 316v,35ma at 1ohm resistors.
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Mesa DC3 bias adjustable bias
I would like to make the bias adjustable-I have found that at 400v on the plates at 70% dissipation I should have 21mv with 1 ohm resistors to measure current.Is...
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Thanks Chuck,I did change the tubes a while back and did not check the bias.I need to find some info on converting to adjustable bias and what would be a...
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I went with the original speaker jack scheme,and fired the amp up this afternoon.Something sounded wrong and I realised the reverb connections were reversed,a...
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Now that I have the new OT I need help with the speaker connections.The DC3 has 3 speaker jacks-8 ohm,4 ohm,4 ohm.The new tranny has 4,8,and 16 ohm outs.Does...
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