'66 Ampeg Reverberocket Issue

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'66 Ampeg Reverberocket Issue

Postby whatdisay on Sun Jan 01, 2017 10:41 pm

So a few weeks back I bought a '66 Ampeg Reverberocket 2 in great shape. Played it for about half an hour before buying. No problems.

Last week I started getting a strange noise appearing "behind" my notes, but ONLY when I would play an E flat. I've had a rattle in an amp before, this is not a rattle. It's something coming through the speaker. I've ruled out any cable, electric or guitar problems.

I first thought it could be the V5 12AX7. I have ended up swapping out both 12AX7s with tried and true 12AX7s that sound fine in other amps of mine. I don't have backup 7591s or a 6U10 yet (I've ordered some from Brent Jesse).

After a few days of just having that kinda scratchy, awful noise behind the E flat notes, I started getting the noise more often. As of yesterday, after playing for a decent stretch, I would hear a sort of high to medium-high pitched hum after I silenced the guitar. I could always get rid of the high-pitched hum by lightly tapping the front of the chassis.

I'm thinking it might be a dying 6U10 but I guess it could also be the power tubes. I've not yet had my tech check out the caps, but it does appear to have a replacement cap can.
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Re: '66 Ampeg Reverberocket Issue

Postby Baron Von Machinenmann on Mon Jan 02, 2017 4:55 pm

Ghost notes are classic symptoms of low filtering/bad filter caps, get her to yer tech pronto. :wink:

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Re: '66 Ampeg Reverberocket Issue

Postby slider313 on Sun Jan 08, 2017 8:55 pm

Baron Von Machinenmann wrote:Ghost notes are classic symptoms of low filtering/bad filter caps, get her to yer tech pronto. :wink:

Yes, especially when you hearing overtones. I've had good luck replacing the original 70/40/40 @ 450v can with 40/40/40 @ 525v. You don't really need 70uf of filtering for an 18 watt cathode biased amp.

The JJ 7591's are good sounding tubes and are cost effective.
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