Humming Vox AC30 reissue that dies down when 'normal' vol is at 1'o clock

[robojim4000]

Yeah so like the title said. My problem seems to be EXACTLY the same as this guy 'TROY'....

http://archive.ampage.org/threads/6/...30_Help-1.html

Problem is i dont know what soved the problem for this guy. Im feeling by reading some forums thats its a 'grounding issue', its def not a tube issue, done that. But like this TROY guy said, the humming dies down when the 'normal' volume is about half way, then gets worse after and before that. It also dies down when 'cut' is 10

Im not THAT technically minded, but would like to have some suggestions of what the problem might be before i take it to someone who will charge a lot of money :-)

[Rick Erickson]

Was there some part of my post in the thread you referenced that you didn't understand? If you have one of the same issue amps I worked on, I can fix it, and yes, I will charge you a lot of money, relatively speaking of course, but your amp will be very quiet in all the channels. My shop is in Washington State. I have customers send me stuff from around the country. Let me know if we can help you. www.aviatoraudio.com

RE

[robojim4000]

well i dont even know if it was fixed or not. i thought the point of these forums was to help each other out by recommending ideas and giving advice, not advertising services

[trevorus]

I would recommend trying some different preamp tubes.

I had a prob with my Vox blowing fuses, and it was a bad Sovtek Rectifier, so it is quite possible you got a bad tube in there.

[pdf64]

The advice in Troy's thread is excellent and if followed will enable the problem to be solved. Repost if you get stuck, or are successful. But like Trevorus says, try substituting known good tubes first. Peter

[MWJB]

Hi Robojim4000

In fairness to Rick's post, he does make suggestions as to remedial steps in the referenced thread. You seemed concerned about paying an unnecesarily high repair cost, therefore I saw Rick's post simply as an assurance that he was familiar with the issues at hand and that he was confident that he could satisfactorily resolve your issues...I'd believe him.

Anyone who repairs/services lots of amps often comes accross specific models with their own little foibles and unique fixes. Mostly with a list of symptoms, we can all make generic suggestions as to points to explore that will possibly resolve them, but in some cases someone will have seen the specific problem before and worked out how to resolve it with the least amount of headscratching time & experimentation (which translates to you as time that you don't have your amp and hours of labour charges).

All the best, Mark.