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well I had already changed all the electrolytics except for the filter caps so I suppose they're alll alright, I had to solder the 2200uf 35v under the baord because the solder points above the board had been damaged and I had to bridge the connections with wires and I just wanted to be sure...

Thanks again for all the help, I did try contacting Mesa US before posting my problems here, but they passed me onto Mesa Italy, who wasn't able to help me. Anyways getting back to the amp, I may have pin pointed the place where the short is, but if possible, I would need you to do some...

Well thanks for the help, but the problem is that I live in Italy so shipping it to the US would be really expensive that's why I'm writing everything down here. I'll get that voltage chart done and post it up. thanks

well after mounting the amp up I turned it on and I am getting some sort of strange DC voltage all round, with the preamp tubes in I was getting like -46vDC on pins 3 & 7 also on the on the NE5532 opamp and also on those 2 zener diodes so it looks like it could be a bad cap up in the low voltage...

I couldn't find your email address, you can try this link: http://farm4.static.flickr.com/3580/3356870910_6871f941c7_b.jpg or just PM me with your email address. Just another couple of questions, what voltages are supposed to be seen on the LDR's? Specialy the opto side of them. What would...

Well from V1 to V4 the tubes were brand new mesa's so I don't think the tube is the problem, this is another strange thing that I noticed.... If I pull V1 out and leave all the other tubes in... the amp doesn't let through HV to the power tubes... that is if I hit the standby there's no...

Hi thanks very much and happy easter to all.... I have gone further and resolved that problem.... there actually was a small solder glob shorting out on the 3vDC heater wire that is very close to one end of that resistor. I know have another problem which is hard to fix and to explain...

Urgent help needed with a Mesa Boogie DC-3......Can anybody please tell me where this signal path leads? With the front control panel facing you it's the right LDR.... the right leg of the photo resistor side of the LDR. On the top side of the board there is a signal path that leads to the...

PM sent

LDR = Light Dependent Resistor The LDR's are used for channel switching (lead and rhythm channels) and 1 for the EQ, I'm not sure which is 1 2 or 3. As for your footswitch problems, I would suspect the footswitch itself not being the correct type for this model.

Here's my problem, the plate resistor (62k) on pin 6 of V1 burnt up yesterday while I was testing voltages. It happened a short while after I turned off the standby. Also there are no tubes in at all so voltages are higher all over the board. I replaced the burnt resistor with a 100k 2 watt, and...

Not so sure about that, the instruction manual states "Mesa dual footswitch" is to be used

I have no idea about that dyno watt mistake.... Make sure you're using the right sort of footswitch for this model, in this amp LDR's are used in the switching matrix for changing the channels and engaging the EQ/footswitch.

Hi and welcome to the board, just answer a few of your questions, there are 3 LDR's on the board, chunky black plastic parts with four legs, 2 on each side. 2 LDR's are sitting right next to eachother above the mid pot wires. I think, but I'm not sure, that Mesa DC 2B (1993) just indicates...

Hi well I contacted the mesa service centre here in Italy and as I thought he wasn't able to help me so I'm going through the board and tracing the paths manually. Looking at the downloaded schematic, look at the switching matrix (last page) the negative voltage off the bridge rectifier goes...

Well now I'm really stuck, the circuit board is most probably a different version than that drawn up in the schematic infact the switching matrix is totaly different including the bridge rectifer, deosn anyone own the correct schematic for the mainboard version MESA DC 23C. The serial number of...

thanks for the replies.... I don't want a general replacement part, I have found them here in Europe and they do cost 200 euros. But that's not what I'm looking for.... I want a genuine mesa boogie replacement part. If anyone can help me out please let me know thankyou

No I haven't because the only way to contact them is by phone..... and our distributor here in Italy isn't as knowledgable as one would think, that's why I posted my question here. If anyone knows a place where I can buy the transformer (euro version) or anyway to get in contact directly with...

I'm looking for an original Mesa euro version power transformer for a 3 channel dual rectifier, can anyone please tell me availability and costs + shipping costs to Italy? thanks

Well I just did some continuity tests between the heater pins on V1 and the rectifier bridge for the DC voltage and here's what I found out: - Pins 4 & 5 get continuity to 1 of the 6800uf caps(that looks correct) but not to the diodes (??) - Pin 9 gets continuity to 2 of the diodes(that looks...