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Post by davyped on Oct 12, 2007 17:48:05 GMT -7
I hope I didn't already blow a speaker the 2nd day i've own the amp. I notice a little buzz when playing on the lower strings at low volume, but as I turn it up louder, the buzz seems to go away. Is this a possible blown speaker? Oh, it only does it on the initial strike of chord and then dissappears. Single notes are ok, no buzz.
Dave
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Post by taswegian on Oct 12, 2007 18:10:04 GMT -7
You might have a little filament rattle from the El84's. It's a common problem, nothing major. There are some threads on how to fix it, mostly using some kind on dampener on the tubes. I hope that's all it is...but that's my guess.
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Post by davyped on Oct 12, 2007 18:19:03 GMT -7
The more i listen to it, it sounds more like the speakers "farting" on the low end. I crank it up and it dissappears. I am going to check for loose screws, just in case. Thanks
Dave
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Post by davyped on Oct 12, 2007 18:40:06 GMT -7
Out of curiuosity, i checked the ohmage on the speakers, and they read about 6.6 ohms (8 ohms) each wired in parallel. The way i received it, it was plugged into the 8 ohm tap when it should have been the 4 ohm tap. Would this cause damage to them in a short period of time?
Dave
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Post by zdogma on Oct 12, 2007 18:57:49 GMT -7
Out of curiuosity, i checked the ohmage on the speakers, and they read about 6.6 ohms (8 ohms) each wired in parallel. The way i received it, it was plugged into the 8 ohm tap when it should have been the 4 ohm tap. Would this cause damage to them in a short period of time? Dave Nah. Should be fine. Its a pretty beefy OT.
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Post by azatplayer on Oct 12, 2007 19:12:51 GMT -7
Basic rule of thumb is you can run to a higher impedence but not from. So 4 ohm out to 8 ohm cab or 8 ohm out to 16 ohm cab. Sound just gets a little loose. But if you run from a higher impedence to a lower impedence cab ie. 8 ohm out to 4 ohm cab, you put strain on the output transformer. This should not hurt your speakers will just sound ordinary maybe farty. Prolonged use will run the risk of damage to your OT. 6.6 is low for a 8 ohm speaker most celestions ive measured run 7.2ish so thats gonna bring things down a tad more. That 6.6 was a measurement on a single speaker? You unplugged one to measure it? If they are still joined then thats the measurement of both in which case theres not really anything to worry about there theres a bit of grace/tolerance. I had a crate club 50 for a while, great amp. It was a 3x10 combo. It ran 3 x 16 ohm speakers giving a load of 5.3 ohms. The amp was sending from 8 ohms. It was 12 years old when i got it and sounded awesome. However 6.6 / 2 is 3.3 ohm load, and you wanna get that in the 4 ohm out straight away. Like Tas said tho, tubes are such fragile items. The Doc states that the amps should be play tested by the dealer and that starts the warranty process. If something is gonna fail, it will do so in the first few days has been my experience. Ive had quite a few amps shipped from the States to Aus and had to pull a tube pretty well straight away. Just par for the course. I never leave home without a backup of tubes as even a bump in the road can damage one of the little buggers. Just make sure your maths is right with the speakers, then try replacing a tube at a time. The fact its an initial buzz may be a tube. I often run my boogie 1x12 at 4 ohms send to 8 ohm load. Makes it a bit looser and a little less output. Sounds good late at nite. Cheers ps sorry for the long post :-)
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Post by davyped on Oct 12, 2007 20:29:22 GMT -7
I hear ya. I always carry a backup set of tubes. Yea, that was one speaker. Maybe I didn't make good contact. I checked the plug with both speakers in parallel and I measured 4.2 ohms. No worries.
I am normally a Greenback/ V30 guy with my other amps. This is my first amp using Blues. I just don't know how fragile these blues are. I hear all the horror stories. I do love the sound.
Dave
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Post by zdogma on Oct 13, 2007 3:52:57 GMT -7
I hear ya. I always carry a backup set of tubes. Yea, that was one speaker. Maybe I didn't make good contact. I checked the plug with both speakers in parallel and I measured 4.2 ohms. No worries. I am normally a Greenback/ V30 guy with my other amps. This is my first amp using Blues. I just don't know how fragile these blues are. I hear all the horror stories. I do love the sound. Dave Surprisingly, they're not that fragile. I've used mine for about 5 years with a whole bunch of amps, no problems at all. It can get a little farty, like you said, especially with a single speaker, but they're durable enough. The wattage rating is conservative, thry'll take 18-20 watts each as long as you're not using heavy distortion or fuzz.
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Post by davyped on Oct 13, 2007 4:00:45 GMT -7
I did some research on the forum for the tube rattle you guys were talking about. From everything I read, it seems to be what I am experiencing. Never owned a el84 based amp so this tube rattle is new to me (never a prob with my EL34 equipt amps). I ordered some of those dampers off of ebay, I'll give them a shot first before replacing tubes. Thanks everyone for your help and being patient with me.
Dave
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Post by billyguitar on Oct 13, 2007 18:20:12 GMT -7
8 ohm speakers will measure about 6 with your meter.
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Post by telejas on Oct 14, 2007 11:03:25 GMT -7
Check to see if the speaker is screwed in tight enough..... From Weber's website, they should be "finger tight" and then cranked another 1/4 of a turn..... I usually go about another full turn, but that's just me - use your own judgment. I've also been known to crank them down pretty hard.
I had a 1970 Deluxe that I though I blew the speaker in, rattled on the low E string.... One day I finally checked in to why it sounded like that and the speaker was pretty loose, so I thightened it up and got 2 times the bass I had before and a tighter tone..... Not saying that's what your problem is, but it's worth checking.
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Post by davyped on Oct 14, 2007 11:31:28 GMT -7
Check to see if the speaker is screwed in tight enough..... From Weber's website, they should be "finger tight" and then cranked another 1/4 of a turn..... I usually go about another full turn, but that's just me - use your own judgment. I've also been known to crank them down pretty hard. I had a 1970 Deluxe that I though I blew the speaker in, rattled on the low E string.... One day I finally checked in to why it sounded like that and the speaker was pretty loose, so I thightened it up and got 2 times the bass I had before and a tighter tone..... Not saying that's what your problem is, but it's worth checking. Thanks, that was one of the first things I checked. When I played it yesterday, no problems, no rattle. I am convinced it is just a tube rattle. I think I was just being over paranoid about the blues. Dave
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Post by telejas on Oct 14, 2007 17:47:57 GMT -7
Check to see if the speaker is screwed in tight enough..... From Weber's website, they should be "finger tight" and then cranked another 1/4 of a turn..... I usually go about another full turn, but that's just me - use your own judgment. I've also been known to crank them down pretty hard. I had a 1970 Deluxe that I though I blew the speaker in, rattled on the low E string.... One day I finally checked in to why it sounded like that and the speaker was pretty loose, so I thightened it up and got 2 times the bass I had before and a tighter tone..... Not saying that's what your problem is, but it's worth checking. Thanks, that was one of the first things I checked. When I played it yesterday, no problems, no rattle. I am convinced it is just a tube rattle. I think I was just being over paranoid about the blues. Dave The EF86 is notorious for a "rattle" or metallic sound (microphonic) sound. Just a heads up, and unfortunately it's the most expensive tube in there and the least stable (but the sweetest sounding(.
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Post by bluzman on Oct 15, 2007 21:27:43 GMT -7
I have two cabinets that I used with different heads. Both are relatively new. Anyways, it seems that the rattle came and went depending on a few things... I went crazy trying to figure it out. So finally I took the back off of one of the cabinets and the rattle went away.
What I did was to get rubber silicone and zigzagged it along the cleat where the back screws into. Just a small but consistent bead. Let it dry for two days. Then I tightly screwed it all back together and no more rattle... I ended up doing this with two other cabinets recently JUST IN CASE!!
Here near the NE coast wood tends to move ALOT!!
PaulT
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