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Just got this fixed yesterday. I had a good look at it and found a cold solder on V1. It now sounds better than ever, no noise at all and beautiful Boogie tones. :)

Tubes seem fine as I checked them all again, but I found some more interesting info to the problem. The Rhythm 'Gain' pot shuts off when you turn it up to 10, both Gain pots were a little noisy, could use some Detoxit. Should the Rhythm Gain pot be replaced? These pots also appear to be...

I thought it might be tubes also and swapped out all the preamp with new ones and the power tubes from my other amp, which are fairly new also, didn't seem to change anything. I will revisit that again to make sure. Thanks.

I suppose I would need a good working DC-3 to be able to make a comparison. Seems strange though, that the majority of hiss is on the Rhythm channel, I would have expected the lead to have more. Would that be like running it 4-5 hours straight in a band situation, or more? Will do, great...

Hmmm... the tapping comes through the speaker on a number of components but REALLY loud on just those few. If that's normal, then I haven't found the problem. That may be possible, I re-soldered all the power tube socket connections last time round, should I redo the preamp tube sockets as...

Always using chopsticks. Thanks.

Some details: The 500K and the 180K cap connected to the V1 tube socket are very loud when tapped ONLY when the amp is on the Rhythm channel and are normal when changed to the Lead channel. There is also a 250k cap attached to the lead of the Rhythm Gain pot that makes a lot of noise when...

Pushing lightly on the cap under V1 and the 1M resistor near it adds a lot of hum to the noise.

Tapping the capacitors and 1M resistors just under V1, V2 and V5 are coming out very loud. The rhythm channel has far more noise on it than the lead channel. I may have found a few culprits to the noise.

Thanks GD, that's most likely what I'll do. I suppose it could have been worse if the guy bought the amp, brought it home and it started doing that, I'd probably have a major hassle on my hands. I'll check out the tubes first and make sure it's not that.

I have my DC3 combo up for sale as I'm moving to a head/cabinet configuration. Wouldn't you know it, a guy comes over to buy the amp, we turn it on and there are hisses, crackles and pops coming out at lower volumes that gets worse as the volume goes up on both channels. He immediately passed on...

It is a high gain tube, so it's probably not the best position to put it into a clean channel.

Popping is usually due to an arcing issue, in which the high voltage has found a path that doesn't like high voltages and it discharges through that path, usually an issue when using the standby switch. That said, there can be arcing with the tubes, sockets, switch (standby), caps and resistors...

Here are the various preamp tubes you can swap around giving you variations of gain. For example, I put a 12AT7's in the V6 position which sort of "tames" the high gain output of my DC-3 amp. Some will put a 5751 tube in the V2 (lead) position to "tame" the high gain of the lead channel. 12AX7...

As well, you most likely test the parts you send out so that the mod will work, which is a cost to you. I know that if you buy parts from electronic stores, there's no guarantee they will all work and finding the problem afterward is a big pain in the ... Even the little kits that electronic...

1993 DC-3 w/ G12M-75 - Forest Green Tolex - all new JJ tubes..

That's amazing! The Mojotone is only an $80 speaker, and only 30 watts. Do you ever play it without the cab? I'm looking for a single speaker swap out and was wondering what that speaker sounds like on it's own... ?

Hi I've got a 1993 DC-3 which has a Celestion G12M-70. I'd like to replace it. What's your preference replacement speaker for this amp and why do you like it? I'm thinking maybe the 50 watt Celestion Gold or is that overkill? Cheers!