The Amp Garage

In recent times, Postimage, where I have stored the images of this topic, has been experiencing problems. I'm slowly fixing this, but it's still not all right. I hope you understand.


Cheers

Really! This scheme was for a short time with the active link.

And it would have been lost, were it not for our good friends, who did the favor of keeping the file for us:

http://www.handmades.com.br/forum/index ... #msg171267

Enjoy

Hi 10thTx There are still bugs in your layout. :( The NFB should be connected to turret 19, on pin 7 of V2. Also the transformer connections have to be made with more care. As it stands, the NFB turns into PFB, and the amplifier gets noisy, and some oscillations. Follow the schematic exactly to make...

Hello. It's great that people make their own layouts. The schematics too. They always tell me that my schemes are confusing, but I relied on PCBs to form the groups of components. There is no problem in reissuing. Just do not remove information, such as the working voltage of the capacitors, or the ...

Hello guys. Many may have wanted to create your own amp 1W, but do not know if it will be good. Here is a video and sample of axehack , who set up his own JTM1. Link: https://www.youtube.com/watch?feature=player_embedded&v=bL4m4kCeHAE The description is in TDPRI Forum at this link: http://www.tdpri....

Hello odrpol

At first, the scheme is the most correct.

Not that the layout does not work.

There is information that the "A" section of 12AX7, pins 6,7 and 8, produce less noise. Then, for most assembly the "A" section comes first.

But as the work would not have problems.

Cheers

Hello odrpol Would not this inversion amplification stages of the valves, it is the big problem. The amplifier equal work. What goes wrong on your amp tensions are appearing in places that should not appear. When you showed the first schemes to measurements without the valves , everything was wrong....

Hello odrpol. Here is the schema "my" JTM1 with the measured voltages to the valves. There are no mistakes in the assembly, and these tensions were measured several times and remained stable. An error that exists in my schemes published before is the value of R31. appearing as 2,7k, but it is actual...

Hello odrpol The pin 5, as you know, is the power of the heaters. If there is a wrong contact, he can do what you said, but it is rare. Make sure the valve pin is not oxidized, and if the socket is in good condition. If so, replace it The valve 12AU7 heats up more than the others, obvious, there is ...

Hello odrpol I got explanations about the layout. Talking about the heaters. If your transformer has 6.3V for the heaters, the V1 and V2 valves are with the right connections; V3 is already wrong, because it should also be with the pin 4 and pin 5 connected. In case the connection between the pin 9 ...

Hello odrpol I have some questions: As you had stated, these measurements were made without the valves. No valves, no current consumption, then every source voltage would be close to the maximum in all the terminals of the anodes of the valves in the circuit. Approximately 295v there in your circuit...

Hello odrpol If you are really made these measurements without the valves, it is almost everything wrong. If you did with the valves, it is still incorrect. Within a few days I will make measurements on my amp, and post here for comparison. Provide some pictures of your amp and post here. Cheers Mat...

Can you explain how it was "nothing like the real deal"? What would be needed for you to consider a 1 Watt amp to be the "real deal"? I was curious too ... :) I do not have new pictures of the inside of JMP1. The only photo I found on the Net is this. [img:852:514]http://s26.postimg.org/8cumg5e6h/J...

Who has an amplifier JMP1 and want to contribute, please post the pictures here.

Accepts photos of both sides of the main pcb and toneboard.

Preferably images with high resolution.



(If moderation does not agree with this topic, please, remove it)

Littlewyan I do not know exactly what might be wrong with the tone of your amp. But let me ask you: Have you tried to reduce the NFB resistor (R15) to half of its value? (And while increasing C11 to double the amount). Let me explain my idea. IF by chance the actual impedance of the OT is 10K, the N...