Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Applemacman on April 11, 2021, 05:03:50 AM

Title: Bittlehead crack hum [resolved]
Post by: Applemacman on April 11, 2021, 05:03:50 AM

Hi after several months of non problematic use, this morning I switched on my bottlehead crack sound only came out of right channel. So took it to the bench to have a look could not see any issues and bearing in mind been working fine for several months. Switched it back on and now no sound out of either channels but a low hum that gets a bit louder if you turn the volume up. Any ideas?

Title: Re: Bittlehead crack hum
Post by: Paul Birkeland on April 11, 2021, 05:04:41 AM

I would check your voltages.

Title: Re: Bittlehead crack hum
Post by: Applemacman on April 11, 2021, 05:40:03 AM

Ok voltages
1.  71
2.  154.1
3.  0
4.  154.3
5.  74
6.  0
7.  96
8.   0
9.   97.9
10. 0

Speedball
OA.  95.2
OB.  95.4
G.    0
B+.  153.1

Title: Re: Bittlehead crack hum
Post by: Paul Birkeland on April 11, 2021, 06:14:59 AM

This is most likely a loose solder joint, but the voltages don't point to anything specific.  It doesn't take more than 15-20 minutes to just reflow each joint, but generally you can skip the solder joints with the LEDs and the joints on the power switch.

Title: Re: Bittlehead crack hum
Post by: Applemacman on April 11, 2021, 07:07:12 AM

Well dont I feel the stupid one, after all this ive discovered its the rca leads from the riaa to the bothlehead crack which ate the issue.