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There is a Mark IV on my bench with the same problem.. Possibly a short circuit somewhere.. I will start from...
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Most of the reverb tanks I see have a DC resistance of 1R on their inputs. These should have an impedance of 8/10R at 1kHz. I will stick to 10R, but a 1W...Last edited by aiyiadam; 03-26-2023, 09:19 PM.
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Dummy load instead of a reverb tank..
I have already fried a reverb transformer and decided to be more careful.. But it is often a hassle to connect the reverb tank when I am working on an amp....Last edited by aiyiadam; 03-26-2023, 07:02 PM.
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Thank you for the link. The suggested grounding makes a lot of sense.. However, I have tried it and it didn't change much....Last edited by aiyiadam; 03-20-2023, 08:40 AM.
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It has been a while.. I had to wait for the components and It is cumbersome work..
Since I have taken everything apart, I had the chance to inspect...Last edited by aiyiadam; 03-19-2023, 12:06 PM.
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True.. It is a similar one.. Those kits don't seem to be very popular anymore.. Last month I had difficulty buying a second kit in aliexpress. The new irons...
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I bought one of those kits and built myself a soldering station. I am using it with a laptop power supply since 4 years and didn't have any problems. Cheap...
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Thank you Chuck H. Let me put here a closer photo of the board. This is like cardboard and it is coming apart.
...Last edited by aiyiadam; 11-26-2022, 12:50 PM.
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Fender Dual Showman Reverb with safety issues
This amp still works.. I didn’t have the guts to power the amp, but the new owner had tried it.
I don’t have a lot of experience with those...Last edited by aiyiadam; 11-25-2022, 12:59 PM.
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Yes. Somebody from product support wrote me that the power section is based on the TI LM3876 circuit and the rest of the amp is proprietary.
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Fuzzy sounding Tech21 Trademark 60
I really hate this amp..
The owner of the amp claimed that the amp has lost its "sparkle" and brought it to me. Sparkle surely is a...
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This is an interesting amp indeed..
I installed the triode switch.. The pentode mode is a bit louder and it sounds better to me. It is nice to...
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Thank you for the replies.. The interesting thing is that this type of cap is only on this tube socket, which is the closest one to the OT. Maybe the longer...
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Personally I don't really like the triode operation of pentodes.. However, in this special case the pentodes are hardwired as triodes by Mesa and the amp...Last edited by aiyiadam; 01-17-2022, 02:19 PM.
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Capacitor between screen and control grids
The photo is from a Mesa Mark III Blue stripe.. There is this one 30pf capacitor between the screen and control grids of one of the EL34. That confused me,...1 Photo
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Thanks for the reply.. That is the usual implementation with a typical on/on DPDT switch. I have only an on/off/on DPDT switch, which I can use at the moment....Last edited by aiyiadam; 01-17-2022, 08:48 AM.
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