Crack + Speedball upgrade help

[sleyk]

I am trying to build a speedball upgrade on my crack kit and run into some issues.
When i initially built it, there was smoke coming out of the 270W resistor at terminal 15.  I shut it off and resoldered the loose capacitor to remedy the issue.  I also changed my tube to a tungsol 5998 from the old 6080 stock tube.

I ran a voltage check and all of the voltages are way off

1         1.71
2          4
3          0
4          0
5         2.06
6-13      0
14        .5
15         0

A1     -.6
A2     .3
A3    -.05
A4     0
A5     .03
A6     0
A7     0
A8     

Help would be greatly appreciated

[Doc B.]

Check your fuse.

[sleyk]

I found a loose wire from B2 ---> 2 and resoldered it.

The voltages are still off:

Terminal     Voltage    Expected
1                -1.05
2                .58
3                0
4               .58
5               -1.14
6               0
7               0
8               0
9               0
10             0
11             0
12             0
13             .57
14             .57
18            92
19            94
20              0
21             246

B1           -1.04
B2         0
B3          0
B4           -1.16
B5         .56
B6-8      0

A1-9     0
The 5998 tube lights up but the bottom tube lights up slightly.  None of the LEDs respond.  I checked the fuse and gone over all the wiring to no avail.

[sleyk]

Also, I noticed that the 270ohm which was smoking cracked.  I used my multimeter to check the resistance and it reads at 281 ohms.  Could the cracked resistor be the issue?

[sleyk]

I found that the 270ohm 1w resistor from 21 to 14 reads -.60 on the multimeter.  Does that  need replacing?

[Paul Birkeland]

A cracked resistor means it got so hot that it gave up.  This means that there is a short downstream from that resistor.

I would replace them both (they are 5W), then get back to us.

Another user reported a similar issue, as he had left off the insulating shoulder washers that to between the mounting screw and the TIP50 on the bigger Speedball board.

-PB

[sleyk]

Thanks!
I had trouble finding a 5w 270 ohm resistor.   I talked to a guy at the front and he said a 10w 270 ohm works just as fine if not better since it runs cooler.   Is it okay if I use a10w resistor instead?

[Paul Birkeland]

Sure, a 10W will work well.

[sleyk]

I also can't seem to find any nylon shoulder washers.  What is the name of the washer: Nylon #6 Shoulder wash (x4)?

[Paul Birkeland]

I also can't seem to find any nylon shoulder washers.  What is the name of the washer: Nylon #6 Shoulder wash (x4)?

Now I'm really confused.  You have built Crack and are checking voltages, how do the nylon washers come into play?

[sleyk]

Sorry for being so brief.   As stated earlier in the thread,  another user had the same issue with voltages and didnt place the shoulder washers in.   I can't seem to find the washers so it may be causing a short

[Paul Birkeland]

A shorted power transformer will not cook a component downstream from the power transformer (your 270 Ohm resistor).

[sleyk]

I am missing the nylon shoulder washers for the circuit board.   I was hoping I can get the size and name of the type of washers.   I apologize for miscommunicating my concerns.   Thank you!

[Paul Birkeland]

I am missing the nylon shoulder washers for the circuit board.   I was hoping I can get the size and name of the type of washers.   I apologize for miscommunicating my concerns.   Thank you!

Are you referring to the nylon standoffs used to mount the boards?  Are you missing all 4 of them? 

[sleyk]

A cracked resistor means it got so hot that it gave up.  This means that there is a short downstream from that resistor.

I would replace them both (they are 5W), then get back to us.

Another user reported a similar issue, as he had left off the insulating shoulder washers that to between the mounting screw and the TIP50 on the bigger Speedball board.

-PB

Thank you!  I left off the insulating shoulder (i thought they were made of nylon and 4 of them.  I also replaced my 5w 270ohm resistors with 10w 270 ohm resistors.  I did a voltage check and everything is within 15% of the predicted voltage readings!  I appreciate the advice and the patience you have provided me!