232cap
Well-known member
232cap":1fdej6ts said:http://www.mojotone.com/amp-parts/Mojotone-Discrete-Hi-Voltage-Series-Effects-Loop-for-Vacuum-Tube-Amplifiers
baron55":jous8ots said:mboogman":jous8ots said:I've got one. I'm still working it out with one of their techs, for my '79 JMP. It works, is an easy install, I'm just trying to get the levels and Frequency response to be just right.
Meaning it sucks tone?
The reason I ask, is I have used 2 of them and had to mod them to get them to sound correct.
On the return side they are running the signal through a 1 meg resistor then a 10K prior to the transistor. Since the loop is -10dB (pedal level) output, the signal fed into the return is very low and the 1 meg resistor is way to high for this purpose. The return side is supposed to bring the signal back up, so there is no reason to attenuate an attenuated signal.
If you look at the board, the 1 meg resistor is soldered where the silkscreen indicates a .022uF cap. If you remove the 1 meg resistor and replace it with a .022uF cap then the loop works correctly. I am curious if these were incorrectly wired with the 1Meg input resistor because the loop works correctly mostly transparent with the cap as indicated by the silkscreen.
baron55":31g2w8ga said:Yep that is what happen when I used them too. Changed out the 1meg resistor with the cap and all was good.
baron55":2dm669dp said:mboogman":2dm669dp said:I've got one. I'm still working it out with one of their techs, for my '79 JMP. It works, is an easy install, I'm just trying to get the levels and Frequency response to be just right.
Meaning it sucks tone?
The reason I ask, is I have used 2 of them and had to mod them to get them to sound correct.
On the return side they are running the signal through a 1 meg resistor then a 10K prior to the transistor. Since the loop is -10dB (pedal level) output, the signal fed into the return is very low and the 1 meg resistor is way to high for this purpose. The return side is supposed to bring the signal back up, so there is no reason to attenuate an attenuated signal.
If you look at the board, the 1 meg resistor is soldered where the silkscreen indicates a .022uF cap. If you remove the 1 meg resistor and replace it with a .022uF cap then the loop works correctly. I am curious if these were incorrectly wired with the 1Meg input resistor because the loop works correctly mostly transparent with the cap as indicated by the silkscreen.
baron55":ss7yb8gb said:mboogman":ss7yb8gb said:baron55":ss7yb8gb said:mboogman":ss7yb8gb said:I've got one. I'm still working it out with one of their techs, for my '79 JMP. It works, is an easy install, I'm just trying to get the levels and Frequency response to be just right.
Meaning it sucks tone?
The reason I ask, is I have used 2 of them and had to mod them to get them to sound correct.
On the return side they are running the signal through a 1 meg resistor then a 10K prior to the transistor. Since the loop is -10dB (pedal level) output, the signal fed into the return is very low and the 1 meg resistor is way to high for this purpose. The return side is supposed to bring the signal back up, so there is no reason to attenuate an attenuated signal.
If you look at the board, the 1 meg resistor is soldered where the silkscreen indicates a .022uF cap. If you remove the 1 meg resistor and replace it with a .022uF cap then the loop works correctly. I am curious if these were incorrectly wired with the 1Meg input resistor because the loop works correctly mostly transparent with the cap as indicated by the silkscreen.
Hmm. I'll look and see what's going on with mine, because yeah, I'm seeing a significant drop in HF.
Yep that is what happen when I used them too. Changed out the 1meg resistor with the cap and all was good.
jerrydyer":2o2uocu3 said:the metro loop is cool. a little white noise but...???? they all have drawbacks. Larrys from Larry Amplification has been the purist, quietest one ive used and installed for people. Ive been happy with Mojo stuff in the past but havent tried this loop. prob the same as the metro or generic marshall loop. I can get away with effects in a passive loop for low level recording. sounds the best to me too.
rpurdue":21xlnz69 said:Hey guys. I just got this loop as well and it sounds off. Can anyone tell me which resistor is wrong? I can't find a schematic and all the resistors are too close to the board to see the printed number under neath?
Thanks
baron55":38bu9c13 said:mboogman":38bu9c13 said:rpurdue":38bu9c13 said:Hey guys. I just got this loop as well and it sounds off. Can anyone tell me which resistor is wrong? I can't find a schematic and all the resistors are too close to the board to see the printed number under neath?
Thanks
It would be Sunday before I can get any kind of picture of this, but looking at the board, with the connectors facing away from you, it's below the return connector. It probably looks like the slot for the resistor is too long, and come to find out, when I pulled it off, it had ".022" (I think) silk screened onto the board. Hope that helps.
Yep that is correct. For some reason they have a 1 meg resistor in place of the .022uF cap. Pull the 1 meg resistor and put in a .022uF cap and you will be good to go.
baron55":31lxdvoa said:mboogman":31lxdvoa said:rpurdue":31lxdvoa said:Hey guys. I just got this loop as well and it sounds off. Can anyone tell me which resistor is wrong? I can't find a schematic and all the resistors are too close to the board to see the printed number under neath?
Thanks
It would be Sunday before I can get any kind of picture of this, but looking at the board, with the connectors facing away from you, it's below the return connector. It probably looks like the slot for the resistor is too long, and come to find out, when I pulled it off, it had ".022" (I think) silk screened onto the board. Hope that helps.
Yep that is correct. For some reason they have a 1 meg resistor in place of the .022uF cap. Pull the 1 meg resistor and put in a .022uF cap and you will be good to go.