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Post by psj1026 (Pete) on Jan 20, 2023 17:54:50 GMT -7
Did some research and made one for my newly aquired Ghia. I have never liked attenuators and that is only more the case than ever. It sounded surprisingly good and I did foolishly switch back and forth on the attenuator between 4 and 8 ohms. One sounded much better leading.me to believe I might have it backwards. Fast forward after several hours and days later and it just blew up tonight. Low volume then crackling and popping and tubes lit up while it did that. Shut it right down and made sure everything was connected right. Removed attenuator, same thing. F$^#&K! So next is an email to the Doctor with my tail between my legs and a new Master volume after whatever is blown is fixed.
I guess Lpads are not harmless afterall.
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Post by smolder on Jan 20, 2023 21:16:28 GMT -7
So… from what I’ve seen and read, the common diagram / schematic uses a 50 watt Lpad. And reportedly, those blow pretty easily. Many in the discussions, recommended going to 200 watts. You may know all this… but thought it might be helpful.
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Post by nicholas on Jan 21, 2023 8:41:29 GMT -7
Well that blows.... Maybe it's just a bad tube(s). The heater filament can still light up and the tube not create any output. I'd check the fuse, clean the sockets and try a fresh set of power tubes. Hopefully it's just something simple. Did you smell anything like an electrical burning smell? Usually that tells something too.
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Post by psj1026 (Pete) on Jan 21, 2023 15:00:50 GMT -7
Well that blows.... Maybe it's just a bad tube(s). The heater filament can still light up and the tube not create any output. I'd check the fuse, clean the sockets and try a fresh set of power tubes. Hopefully it's just something simple. Did you smell anything like an electrical burning smell? Usually that tells something too. It looks fine and has no smell whatsoever. No burnt components inside. I want to send it in anyway to get a master volume and will give it a retube since I bought it used. I am hoping it had nothing to do with the Lpad but I would be interested in what the experts have to say. I will never use one again myself but it sounded great when it was working so maybe someone else can use it
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Post by psj1026 (Pete) on Jan 21, 2023 15:11:00 GMT -7
So… from what I’ve seen and read, the common diagram / schematic uses a 50 watt Lpad. And reportedly, those blow pretty easily. Many in the discussions, recommended going to 200 watts. You may know all this… but thought it might be helpful. Yes I used a 100 watt version but all I can think of is the ohms were off. If I was running from the amp, 4 thru the attwnuator into an 8 ohm speaker for a short time would that be wnough to break something? I trued to meter it out of the attenuator but I was not getting anything consistent.
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