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Post by gouge on Mar 5, 2015 16:53:13 GMT -6
the studio ad30 died recently.
blew a fuse in the power supply. (the internal fuse). that's been replaced and it's still dead. the death occurred switching out of bypass mode.
does that sound like the rectifier tube has died? |
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ad30 died
Mar 7, 2015 11:47:17 GMT -6
via mobile
Post by jcoutu1 on Mar 7, 2015 11:47:17 GMT -6
This an Orange? I don't know how fix the issue, but I have an Orange AD30 too. It would be great to know the fix in case I run into the same issue.
With mine, sometimes the channel 2 gain pot seems to get stick on max gain. Turning the pot back and forth won't have any effect. After playing around for a minute or two, it resolves itself. Little ghost in the amp I guess.
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Post by gouge on Mar 7, 2015 19:46:54 GMT -6
yep ad30 head, single channel. probably one of my favourite sounding amps. complex harmonic texture with clarity. :-0
a new tube is coming so time will tell.
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Post by svart on Mar 7, 2015 19:52:13 GMT -6
It's possible. I've heard of shorted rectifier tubes, but I've never experienced it.
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Post by gouge on Mar 7, 2015 19:56:43 GMT -6
is there a way to test continuity of a tube?
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Post by svart on Mar 7, 2015 20:06:00 GMT -6
is there a way to test continuity of a tube? Only to see if it's shorted. It might be easier to remove the rectifier and the rest of the tubes and try to turn on with a new fuse. If it pops, then it's somewhere else. If not, replace the small 12Axx types and try, if it's still good, replace the output tubes and try. That would pretty much rule out everything but the rectifier tube. |
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Post by gouge on Mar 7, 2015 20:09:07 GMT -6
thanks svart,
will remove tubes. good advice.
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Post by scumbum on Jun 14, 2016 22:45:43 GMT -6
thanks svart, will remove tubes. good advice. My AD30 single channel did the same thing a few times , switching out of standby would blow the fuse . I had an amp tech check it out and he couldn't find anything wrong . It hasn't done it in a while and has been working good . So maybe its a common problem with these amps . |
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Post by jazznoise on Jun 15, 2016 16:02:00 GMT -6
Not unusual, Vox amps are notorious for doing this and I've heard more than a few techs recommend bypassing the standby switch on them for that reason. In future I'd say just have it on or off.
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Post by popmann on Jun 15, 2016 18:19:20 GMT -6
I had a Bassman clone that kept shorting the rec....if caught quickly enough it wouldn't take the power tubes with it.... tech said I needed to find a NOS rec "and never have that problem again"....I went with a TAD, because they will dealer exchange them right up the road with any failure. Never needed another one to test that policy.  |
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Post by EmRR on Jun 16, 2016 10:59:58 GMT -6
Shorted rectifier, shorted power tube, shorted power supply cap, or shorted EL84 cathode bypass cap (test points 9 and 10) are all pretty common problems. I'd try it with no rect first, if no problem, put the rect back in and try it for a brief moment (long enough for the rect to start coming up, don't want to let voltage go too high for any duration) with the power tubes pulled. Those tests should give a clue if it's a particular tube/set. The schematics show test points with reference voltages. And yeah, the standby is a convenience, not a requirement. If it never pops when just powered on directly into play mode, you could live with that. Keeping an amp on in standby mode is terrible for tubes anyway, old lit suggests never more than 15 minutes max, and rarely.
The max volume problem is indicative of an intermittent ground on the pot, which seems likely to happen with all the separate interconnected boards, I assume press on connectors.
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Post by Ward on Jun 16, 2016 16:22:41 GMT -6
Did you know, you can get a solid state rectifier replacement for a tube rectifier that will plug into the socket where the tube is now? A SS rectifier delivers a much more stiff sound than a tube one does. Less compressed when pushed. It bogs down less and has a much tighter bass response. Just an option. By the way, A rectifier is a rectifying diode. And what is a solid state rectifier? It is 4 solid state diodes in a circular circuit. And it works the same as a Tube rectifying diode. HEre: Just so you know what you're dealing with: en.wikipedia.org/wiki/Rectifier And P.S. It is STRONGLY advisable not to operate most tube amps with the tubes in and the rectifier removed. After all, what is left to convert the AC to the DC that the tubes and the circuits need? |
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Post by EmRR on Jun 16, 2016 16:56:57 GMT -6
It is STRONGLY advisable not to operate most tube amps with the tubes in and the rectifier removed. After all, what is left to convert the AC to the DC that the tubes and the circuits need? If the rectifier is out, there's nowhere any AC can go at all past that point. It's a test to make sure the power transformer doesn't have a short. There are the odd cases which have a SS rectifier in parallel with the tube type, and that would still change AC to DC. But not in this amp. |
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Post by Ward on Jun 16, 2016 18:14:52 GMT -6
Thats true. You have a good point.
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Post by svart on Jun 17, 2016 11:13:44 GMT -6
Did you know, you can get a solid state rectifier replacement for a tube rectifier that will plug into the socket where the tube is now? A SS rectifier delivers a much more stiff sound than a tube one does. Less compressed when pushed. It bogs down less and has a much tighter bass response. Just an option. By the way, A rectifier is a rectifying diode. And what is a solid state rectifier? It is 4 solid state diodes in a circular circuit. And it works the same as a Tube rectifying diode. HEre: Just so you know what you're dealing with: en.wikipedia.org/wiki/Rectifier And P.S. It is STRONGLY advisable not to operate most tube amps with the tubes in and the rectifier removed. After all, what is left to convert the AC to the DC that the tubes and the circuits need? Tube diodes can work like a half or full wave rectifier, so we'd need to know the tube number, as well as how the circuit is hooked up. You could make a half-wave or full wave with 2 or 4 solid state diodes as well. |
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