Herbert hissing on all channels

[stinkfist]

1. The V1 is microphonic
2. It can be that the hum trimmer inside the amp is broken
3. The cable or the guitar is not grounded in the right way

If the problem don´t will be fixed by Yourself, please contact
Terry at Diezel US first.

Thanks,

Peter

Thanks Peter, I will try an new guitar cable and a different guitar as well. I will also see if I can find a good V1.

How would I know if the trimmer inside the amp is broken, could it break on it's own?

Do you have Terry's number or email if i need to contact him.
Thanks!

 

[duesentrieb]

http://www.diezelusa.com

 

[stinkfist]

http://www.diezelusa.com

Thank you Duesentrib!

 

[King Crimson]

Definitely follow Peter's instructions. Also, I noticed in your video that you have a cable going to the input of Herbert. I'm guessing it is connected to your guitar. You might want to disconnect the input cable to isolate it so you only have Herbert connect to your speaker load. You might want to try different speaker cables too. I don't know if you are powering more than one cab with Herbert, but narrow it down to no guitar cable and one speaker load to your cab. Then try what Peter said:

With Herbert in standby mode, no guitar cable connected to Herbert’s input set the volume on channel 3 to 12:00 set the gain on channel 3 to 0 and set the master volume 1 to 0. Defeat the run switch to play mode. Then slowly increase the gain on channel 3 to 12:00, and then slowly increase the master volume 1 to 9:00. Do you hear any abnormal humming?

 

[stinkfist]

Definitely follow Peter's instructions. Also, I noticed in your video that you have a cable going to the input of Herbert. I'm guessing it is connected to your guitar. You might want to disconnect the input cable to isolate it so you only have Herbert connect to your speaker load. You might want to try different speaker cables too. I don't know if you are powering more than one cab with Herbert, but narrow it down to no guitar cable and one speaker load to your cab. Then try what Peter said:

With Herbert in standby mode, no guitar cable connected to Herbert’s input set the volume on channel 3 to 12:00 set the gain on channel 3 to 0 and set the master volume 1 to 0. Defeat the run switch to play mode. Then slowly increase the gain on channel 3 to 12:00, and then slowly increase the master volume 1 to 9:00. Do you hear any abnormal humming?

I will give this a shot when I get home. I have one speaker and the guitar was connected.

 

[King Crimson]

I will give this a shot when I get home. I have one speaker and the guitar was connected.

Very well. Let us know, we'll get this solved one way or another.

 

[stinkfist]

I will give this a shot when I get home. I have one speaker and the guitar was connected.

Very well. Let us know, we'll get this solved one way or another.

Thanks for all of your help(everyone)! I hope I get this fixed once and for all, it's really bumming me out

 

[Hey_bert_whtcha_doin_bert]

I gotta ask a quick question, you had the guitar plugged in and all right? Was the volume up on the guitar, because you were getting feedback and that's quite normal if you're not touching the strings and have the volume opened up, it's like pointing a mic at a speaker when the volume is too high. If your volume wasn't up on the guitar then you probably have something else wrong. Also to get hum like that when a guitar is connected and not touching the strings is normal because you then have an open ground. OF COURSE THIS ALL COMES TO A MUTE POINT IF YOU HAVE ACTIVE PICKUPS OR A BAD GROUND IN YOUR HOME/ELSEWHERE. Do you know if it does it when not playing at home?

 

[stinkfist]

I gotta ask a quick question, you had the guitar plugged in and all right? Was the volume up on the guitar, because you were getting feedback and that's quite normal if you're not touching the strings and have the volume opened up, it's like pointing a mic at a speaker when the volume is too high. If your volume wasn't up on the guitar then you probably have something else wrong. Also to get hum like that when a guitar is connected and not touching the strings is normal because you then have an open ground. OF COURSE THIS ALL COMES TO A MUTE POINT IF YOU HAVE ACTIVE PICKUPS OR A BAD GROUND IN YOUR HOME/ELSEWHERE. Do you know if it does it when not playing at home?

Yes. I understand the feedback part...you can hear it as I turn the gain up to 12 but the hum is very loud and I only have the volumes at 9PM. The camera didn't do the hum justice to be honest. I'm going to try a few things that are talked about here and go from there. I don't play out yet...I'm a noob hehe remember?

 

[Hey_bert_whtcha_doin_bert]

Word up dude Just trying to start from easiest up, can't tell you how many times I've done something like that and not think about it, ya know.

 

[stinkfist]

Word up dude Just trying to start from easiest up, can't tell you how many times I've done something like that and not think about it, ya know.

I hear you, and thanks! Any help with this issue no matter what it may be is great. I appreciate it very much!

 

[King Crimson]

I gotta ask a quick question, you had the guitar plugged in and all right? Was the volume up on the guitar, because you were getting feedback and that's quite normal if you're not touching the strings and have the volume opened up, it's like pointing a mic at a speaker when the volume is too high. If your volume wasn't up on the guitar then you probably have something else wrong. Also to get hum like that when a guitar is connected and not touching the strings is normal because you then have an open ground. OF COURSE THIS ALL COMES TO A MUTE POINT IF YOU HAVE ACTIVE PICKUPS OR A BAD GROUND IN YOUR HOME/ELSEWHERE. Do you know if it does it when not playing at home?

Take it easy on ol' stinky...don't forget, he's a N00b!

 

[stinkfist]

Definitely follow Peter's instructions. Also, I noticed in your video that you have a cable going to the input of Herbert. I'm guessing it is connected to your guitar. You might want to disconnect the input cable to isolate it so you only have Herbert connect to your speaker load. You might want to try different speaker cables too. I don't know if you are powering more than one cab with Herbert, but narrow it down to no guitar cable and one speaker load to your cab. Then try what Peter said:

With Herbert in standby mode, no guitar cable connected to Herbert’s input set the volume on channel 3 to 12:00 set the gain on channel 3 to 0 and set the master volume 1 to 0. Defeat the run switch to play mode. Then slowly increase the gain on channel 3 to 12:00, and then slowly increase the master volume 1 to 9:00. Do you hear any abnormal humming?

OK hehe I have just my cab plugged into the amp nothing else. I have tried 2 different speaker cables. I have also changed out all the preamp tubes and tried multiple ones in V1. The him still is there even on channel one but its not as loud but you can hear it as I increase the volumes....

What should I try next I cant imagine that 12 different preamp tubes in v1 are all bad.

noob!

 

[RG955TT]

What I am hearing seems normal to me...some hum from some makes of humbuckers is normal if they don't have matched coils (i.e my Suhr Aldrich pickups have substancially more noticable hum than my Anderson H2+) If you want to guage the hiss/preamp noise re-post video with the guitar volume turned all the way down. Then what you are hearing is just the preamp tube gain and noise, should sound like a waterfall if the tube is bad and uneven too. These amps have a wild amount of gain (at least my Einstein does) so by 11 -12 oclock channel two is sporting a ton of gain, more than I need. This in turn is amplifying even the smallest amount of guitar pickup hum by a large large amount. The other thing is because you don't play anything we have no idea of noise to output ratio, in other words I can't tell if that amount of hum is normal for the volume striking the guitar would create. Hope this helps, good luck.

 

[stinkfist]

Definitely follow Peter's instructions. Also, I noticed in your video that you have a cable going to the input of Herbert. I'm guessing it is connected to your guitar. You might want to disconnect the input cable to isolate it so you only have Herbert connect to your speaker load. You might want to try different speaker cables too. I don't know if you are powering more than one cab with Herbert, but narrow it down to no guitar cable and one speaker load to your cab. Then try what Peter said:

With Herbert in standby mode, no guitar cable connected to Herbert’s input set the volume on channel 3 to 12:00 set the gain on channel 3 to 0 and set the master volume 1 to 0. Defeat the run switch to play mode. Then slowly increase the gain on channel 3 to 12:00, and then slowly increase the master volume 1 to 9:00. Do you hear any abnormal humming?

OK hehe I have just my cab plugged into the amp nothing else. I have tried 2 different speaker cables. I have also changed out all the preamp tubes and tried multiple ones in V1. The him still is there even on channel one but its not as loud but you can hear it as I increase the volumes....

What should I try next I cant imagine that 12 different preamp tubes in v1 are all bad.

noob!

I also tried this....

However, it is possible that the humm trimmer is not neccessarily dysfunctional. To find out that:
1. Remove the head from the head shell.
2. Turn the head upside down laying on something stable from its output transformers (beware not to break the power tubes!).
3. Connect the speaker cable!!
4. Power up.
5. Select Ch4 on normal playing volume and gain.
6. Locate the hum trimmer. (Similar to the bias trimmer, but on the "other end" of the board).
7. Adjust the trimmer and listen. The humm should decay at more or less center position and increase again when adjusted too far. If the trimmer act "weirdly" (such as crackling or scraching noises) it is very likely gone sour and needs to be changed.
8. Buy a new hum trimmer and either change it by yourself, or even better, get someone qualified to do it.
9. Keep on rocking!

When i move the hum pot left and right the him doesnt change at all.. It doesnt get louder or decay. Nothing.

 

[stinkfist]

What I am hearing seems normal to me...some hum from some makes of humbuckers is normal if they don't have matched coils (i.e my Suhr Aldrich pickups have substancially more noticable hum than my Anderson H2+) If you want to guage the hiss/preamp noise re-post video with the guitar volume turned all the way down. Then what you are hearing is just the preamp tube gain and noise, should sound like a waterfall if the tube is bad and uneven too. These amps have a wild amount of gain (at least my Einstein does) so by 11 -12 oclock channel two is sporting a ton of gain, more than I need. This in turn is amplifying even the smallest amount of guitar pickup hum by a large large amount. The other thing is because you don't play anything we have no idea of noise to output ratio, in other words I can't tell if that amount of hum is normal for the volume striking the guitar would create. Hope this helps, good luck.

When I have just the speaker plugged in and nothing else and vol at 12 oclock it does sound like a soft waterfall. On all channels.

 

[stinkfist]

What I am hearing seems normal to me...some hum from some makes of humbuckers is normal if they don't have matched coils (i.e my Suhr Aldrich pickups have substancially more noticable hum than my Anderson H2+) If you want to guage the hiss/preamp noise re-post video with the guitar volume turned all the way down. Then what you are hearing is just the preamp tube gain and noise, should sound like a waterfall if the tube is bad and uneven too. These amps have a wild amount of gain (at least my Einstein does) so by 11 -12 oclock channel two is sporting a ton of gain, more than I need. This in turn is amplifying even the smallest amount of guitar pickup hum by a large large amount. The other thing is because you don't play anything we have no idea of noise to output ratio, in other words I can't tell if that amount of hum is normal for the volume striking the guitar would create. Hope this helps, good luck.

I plug my guitars in and volume is down but still have what you call waterfall or fffffff hiss on all channels. I have tried many different preamp tubes and i just bought 7 tung-sol 12ax7s so im sure they're all not bad and those are ultra low microphonics so they say. I'm assuming i shouldnt have any hiss or waterfall sound on Channel 1 but I do.

 

[jemmx]

Same problem here,

you found the problem?

Thank you.

 

[atomicboy]

hi all,

i just a brand new herbert with 6550 power tubes and experience the same problem as shown in the video.
did anyone find a solution or the problem for the hissing?

thx a lot tom

 

[Wizard of Ozz]

hi all,

i just a brand new herbert with 6550 power tubes and experience the same problem as shown in the video.
did anyone find a solution or the problem for the hissing?

thx a lot tom

If you have eliminated all preamp tubes as a source, it's tech time. If the hum you're experiencing sounds exactly the same as that shown in the video, there is probably a short to ground (bad solder joint) somewhere. Plug a cable into the into the input and touch the tip of the plug at the other end of the cable (the one you'd normally insert into the guitar jack)... does the hum sound +/- the same as when you touch the tip of plug?