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  1. D

    Leaving JCM 800 on in Standby mode.

    I left it on by accident. Noticed it was on in standby mode and freaked out.
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    Leaving JCM 800 on in Standby mode.

    Greetings list, I just wanted to ask if leaving the guitar amp on in standby mode for a week will damage the amp or put significant wear on the tubes? Thanks in advance. David
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    JCM 800 and attenuator grounding issue

    Need to get one of these.
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    JCM 800 and attenuator grounding issue

    No, I dont believe so. What’s wacky is the wire that the speaker is connected to is connected with tabs and not soldered to the speaker. Not messing with it for the time being. It might not be making enough contact?
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    JCM 800 and attenuator grounding issue

    Tes The amp I have has no effects loop built in. I use delay effects and digital effects in the loop if I can. Less distortion on the effects or none for that matter. All in all it’s a nice addition to tweak the sound. The problem I was happening resulted in actual shocks and noisy fb if I...
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    JCM 800 and attenuator grounding issue

    I’m not a professional but I managed to connect a ground wire (It is a shielded copper wire) from inside of the external cab (Speaker chassis) to the actual Amp chassis. It’s solid now just have to remember to disconnect it if I move the amp. I am using speaker cables not instrument cables...
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    JCM 800 and attenuator grounding issue

    The feedback loop goes away when I disconnect the external cabinet.
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    JCM 800 and attenuator grounding issue

    Thanks, I was replying to the other post. OK. So I tried what you said and took out the passive volume box. That led me to try different cables. What I noticed is that I only had feedback when the external cab was connected. I believe it’s something with the external cab.
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    JCM 800 and attenuator grounding issue

    THX, Yes I used one of those (the wall checker) I also used a vol box like that one. Just to fine tune the signal. Both with and without. As far as the Amp. I cannot verify as I have never had any problems I did once take it to the shop and they made no indication of a grounding problem...
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    JCM 800 and attenuator grounding issue

    Great info. I used a basic wall outlet tester and it said there were no ground issues. However ("Receptacle circuit testers have some limitations. They may indicate incorrect wiring, but cannot be relied upon to indicate correct wiring.") For the last two weeks its been tonal bliss minus...
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    JCM 800 and attenuator grounding issue

    Bad Cat Unleash V2 Effects are Danelectro Fab Tone into low input. Effects loop: Danelectro Dan Echo, Empress Zoia, Maxon EQ, passive volume box. All powered by a 1 Spot 9v.
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    JCM 800 and attenuator grounding issue

    Yes. I checked to see if touching anything would make feedback etc. and it was fine. If I had anything in the effects loop in the attenuator it would feedback if I touched anything.
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    JCM 800 and attenuator grounding issue

    First time posting, I am dealing with an attenuator problem with my 1982 JCM 800 4010 combo. Normally it sounds awesome no problems. I recently acquired a really nice attenuator (not mentioning brand). This attenuator has a built in effects loop that was was part of the decision to purchase...

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