Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: danox574 on March 01, 2013, 05:10:21 AM
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built my crack (without the speedball) and was going through the voltage checks, everything seemed great. Both LEDs were on.
When I touched pin A8 on the 12AU7 socket, the LED went out and the voltage was at 13.xx VDC. I got the correct voltage at 3, I don't know what caused the failure, but it seemed to occur right when i touched it. The rest of the amp checks out other than B1 being a little high (140V) but I assume that's just variation in the tube. All of the solder is good as far as I can tell.
LED connected to 3 tests good with my meter but LED connected to 8 now shows open, so I assume it would need to be replaced. Is there any likelyhood anything else was damaged when the LED went out?
I do have some extras in my Seduction c4s kit that I won't be putting together until next weekend, just am curious what the cause might have been so I can double check before blowing another one.
Is the LED unique to the application or can any be used?
-Dan
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Dan,
Yes, the LED is a specific one -- HLMP-6000. My guess is that you shorted the pin out to an adjacent one when testing -- can happen no matter how careful you are. Not likely anything else was damaged. Just call Eileen and she'll send you a new LED.
HTH,
Jim
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Yes! if you bump pin 9 with your probe you blow the LED. I know that because I did it twice.
All is well, I stole the parts out of the Seduction C4S kit and will replace them. The LEDs are cheap and I have a supplier so I just told them to put a handful in my next shipment. I assume you don't cherry pick them.
Anyway, I am now up and running with both my Stereomour and Crack and all is well!
-Dan