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JH100 Dead quiet on top LH input and noisy on RH input

Posted: 25 Mar 2013, 23:27
by Steve Snider
Is there a specific preamp tube related to the second input?

The amp sounds incredible.


Thanks.

Re: JH100 Dead quiet on top LH input and noisy on RH input

Posted: 26 Mar 2013, 12:30
by jboyjams
I'm not sure about that and I didn't compare L and R inputs.

However, a while back I noticed that one of my JH heads had more noise/buzz than the other.
I ended up moving the green wire on V2 which eliminated the noise.

Here's a different thread with pics:
http://marshallvintagemodern.com/viewto ... =38&t=9634

Re: JH100 Dead quiet on top LH input and noisy on RH input

Posted: 26 Mar 2013, 12:48
by Steve Snider
jboyjams wrote:I'm not sure about that and I didn't compare L and R inputs.

However, a while back I noticed that one of my JH heads had more noise/buzz than the other.
I ended up moving the green wire on V2 which eliminated the noise.

Here's a different thread with pics:
http://marshallvintagemodern.com/viewto ... =38&t=9634

Thanks!!!

Re: JH100 Dead quiet on top LH input and noisy on RH input

Posted: 27 Mar 2013, 18:24
by Steve Snider
Was a preamp tube. Now dead quiet. Thanks!

Re: JH100 Dead quiet on top LH input and noisy on RH input

Posted: 27 Mar 2013, 18:43
by austinplayer
What did you use?

Re: JH100 Dead quiet on top LH input and noisy on RH input

Posted: 27 Mar 2013, 18:51
by Steve Snider
I replaced all three with Chinese from the early 90s. Those are great preamp tubes.