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Old 28th August 2004, 12:07 AM   #1
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I have a pair of Dared 300b monos and sl2000a pre. I usually leave the tube gear on 24/7 unless I'm going out of town. I'm dog sitting for a friend and his hound drooled on one of the tubes while I was at work today. I came home to find both monoblocks shut down with a broken tube in one of them. The light on the power supply was off but the switch was on. The power supply will not turn on at this point. I installed different tubes and neither monoblock will turn on. Any ideas?

Thx...Chris
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Old 28th August 2004, 12:17 AM   #2
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Hi,

Quote:
Any ideas?
No idea how the bias is done on those amps but I suspect the cathode resistor will have died as well.

If absolutely nothing lights up in the amps it is quite possible a fuse inside the amp has blown as well.

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Old 28th August 2004, 02:07 AM   #3
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Monoblocks....he drooled on both? Is there a single psu? You need to look for a common denominator....shared between both amps.
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Old 28th August 2004, 02:09 AM   #4
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Hi,

Quote:
Monoblocks....he drooled on both? Is there a single psu?
Dog seems to drool in stereo though....

Cheers,
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Old 28th August 2004, 02:34 AM   #5
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The thing in common may be the circuit breaker for the mains.
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Old 28th August 2004, 04:39 AM   #6
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There is one psu powering both monos. The LED on the PSU no longer lights up. I opened the PSU case and cannot locate a fuse. The damage occured to only one of the monos but seemed to effect the PSU?

Thanks for any help
Chris
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Old 28th August 2004, 07:13 PM   #7
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Chris, I'm sorry, but I really laughed alot reading this.

Didn't the hound get electricuted ?
Maybe it's an alien, having acid in it's drool

Let's get serious.

What do you mean with broken tube ? Did the glass break ?

Can you show any pictures or schematics ?

When you disconnect the damaged monoblock, does the other work ?

Dick.
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Old 31st August 2004, 06:22 AM   #8
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Dick, et al


The glass tube was broken, shattered. I pieced together that it was indeed hound slobber. After some close investigation I noticed the bloddy hound spit all over my amp like a *******' Llama I changed the fuse in the PSU and it works, powering up the other monoblock just fine. I cracked open the damaged unit and needless to say it is royally screwed. Resistors exploded like popcorn, melted caps, the whole bit. I said the hell with it, had a stiff libation and ordered a pair of Dared VP20's. Now I'm left with one 350b mono @ 6w and a PSU...is there anyway to utilize a single flea power mono?

Ahh, this story is further evidence that one should not leave tubes burning 24/7.
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Old 31st August 2004, 07:25 AM   #9
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I would also check the power supply rectifier(s), those usually blow too if you have a serious short.I don't think its wise to leave tube amplifiers on 24/7. When you least expect it theres a short or something and
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Old 31st August 2004, 03:13 PM   #10
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Hi,

Quote:
Now I'm left with one 350b mono @ 6w and a PSU...is there anyway to utilize a single flea power mono?
You can always cut off one ear if you're desperate enough...after that you'll probably start painting like a madman but hey...Why not?

Anyhow, what makes you think the broken channel can't be fixed?

Quote:
Ahh, this story is further evidence that one should not leave tubes burning 24/7.
Nah...Only that it would be wise to keep tube amps above "drool level"....
Which is probably why you see so many high-end gear on "static display" during shows....

Cheers,
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