Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Majicman on May 10, 2018, 10:06:18 AM

Title: Failed Voltage Check
Post by: Majicman on May 10, 2018, 10:06:18 AM

First attempt at the Crack. LEDs are intensely bright after 5 seconds of power on, then dim at 10 seconds but still lit.

Passed Resistance check

Voltages

1. 53
2. 61
3. 0
4. 61
5. 17
6. 0
7. 53
8. 0
9. 16
10. 0

I re-soldered a few joints but no changes. Any suggestions?

Thanks,

Title: Re: Failed Voltage Check
Post by: fullheadofnothing on May 10, 2018, 10:24:28 AM

Post pictures.

Title: Re: Failed Voltage Check
Post by: Doc B. on May 10, 2018, 11:03:31 AM

This is a stock Crack with no Speedball? You have a miswire if the LEDs on the 12AU7 socket light the second you turn on the power switch. They should not light until the heaters in the tubes warm up and the tubes begin to conduct.

Title: Re: Failed Voltage Check
Post by: Majicman on May 10, 2018, 11:49:35 AM

Stock Crack. They take about 5 seconds to light up but then dim after 10 seconds

Title: Re: Failed Voltage Check
Post by: Doc B. on May 10, 2018, 12:15:48 PM

See the blue electrolytic caps on the terminal strip between the 6080 socket and the big white resistors? The one on the volume pot side is in backwards. It is bulged on the end because of this and should be replaced.

Title: Re: Failed Voltage Check
Post by: Majicman on May 10, 2018, 12:38:15 PM

Thank you! That's an easy fix, sorry I missed it. Can it be replaced with any 160V 100uf Cap or does it have to be the same model? Should I replace both blue Caps if I can't get the same type?

Title: Re: Failed Voltage Check
Post by: Doc B. on May 10, 2018, 01:16:21 PM

Any 160V 100uF cap should work fine.