Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: steel on February 25, 2011, 03:35:40 AM

Title: Crack and Speedball Voltage check error
Post by: steel on February 25, 2011, 03:35:40 AM

All assembly completed

 Voltage check:
 1. 12.6
 2. 175

 4. 175
 5. 15.2

On A and B PCB, The led is dark.

How to check?


Sorry,
I found my mistake...R1 is 237R I put 220K

Title: Re: Crack and Speedball Voltage check error
Post by: steel on February 25, 2011, 04:26:17 AM

something wrong?

5. 158V

9. 158V

I am worried about some Transistor maybe burn?
But change a new 12AU7, all Voltage check are right.

AC in : 113V
Heater voltage only AC 5.6V, is OK?

Sorry for my poor english.

Title: Re: Crack and Speedball Voltage check error
Post by: steel on February 25, 2011, 04:29:51 PM

On A and B PCB, The led is dark than others still.

New Check....

1.  74
2.  167
3.  0
4.  166
5.  69

6.  0-60 mV (Floating)
7.  101
8.  0
9.  97
10. 0-60 mV (Floating)

11. 0
12. 0
13. 165
14. 0
15. 183

21. 201

A1. 69
A2. 0
A3. 1.53
A4. 0
A5. 0
A6. can't touch by lead
A7. 0
A8. 1.56
A9. 0

B1. 73
B2. 166
B3. 102
B4. 69
B5. 166
B6. 98
B7. 0
B8. 0
 

Title: Re: Crack and Speedball Voltage check error
Post by: steel on February 25, 2011, 06:57:06 PM

A damaged 12AU7 can cause abnormal voltage?

Finished, but not try to add headphone yet.
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fst3388.myweb.hinet.net%2F2011%2F7823.jpg&hash=1322e9ec9c97a53f784749e680d6b2af39300fe6)

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fst3388.myweb.hinet.net%2F2011%2F7827.jpg&hash=3c871cdd1ac9aec55c0bcb306163f363174ee589)

Two switch, Turn on heater first, Then high Voltage.
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fst3388.myweb.hinet.net%2F2011%2F7828.jpg&hash=d357d8534460c73bb5b79c45edc24501275e00ee)

Title: Hey, can any of you Crack addicts help a brother out?
Post by: JC on February 26, 2011, 06:44:17 AM

I think by luck of the draw, he keeps getting knocked off the front page and perhaps escaping notice...

http://www.bottlehead.com/smf/index.php/topic,1578.0.html (http://www.bottlehead.com/smf/index.php/topic,1578.0.html)

I don't know the circuit even a little bit.