Screwed up my Crack upgrade

[Paul Birkeland]

Q2B looks to have a short.

 

[flyfisher55]

Should I order defective parts from an electronics part shop online or through Bottlehead?

 

[Paul Birkeland]

Whichever is easier.  There are a decent number of local electronics shops that will carry the NTE line of semiconductors.  The NTE123A and NTE198 are the equivalent transistors that go on the larger PC board while NTE159 and NTE39 go on the smaller board.

 

[flyfisher55]

Hello Paul, I'm back to trying to restore my crack. I ordered parts online and replaced the parts in question. Here are my results on large board OA- OL
                OB- OL
                G- 0
                B+- OL
  02B heatsink hot

LED nearest outside rim on B+ side lit
Both LED's on left side of small board lit
One LED at vaccuum tube base lit
All other LED'S are out.

 

[flyfisher55]

I'm presuming the problem has to be traced so I removed large board.

 

[Paul Birkeland]

Can you post voltages? 

 

[flyfisher55]

Small Board
OA-O.L
1A- O.L
B-A/B- 0V
1B-0.L
0B-00.09V

 

[flyfisher55]

Small Board
OA-68.2 V
1A-226.9V
B-A/B-000.0V
1B-226.8V
OB-000.0V

 

[flyfisher55]

LED at A3 is the one out along with two on small board below 1B

 

[Paul Birkeland]

Can you post some photos of your build?  It's very unusual to see 0V on one of the outputs of the small PC board.

 

[flyfisher55]

I'm enclosing a few hope these help.

 

[Paul Birkeland]

Can you unscrew the board and tilt it out of the way so we can see the socket wiring?

 

[flyfisher55]

I tool these last night.

 

[flyfisher55]

more pics

 

[Paul Birkeland]

The wire at A4 is not attached and not particularly well soldered.

 

[flyfisher55]

I resoldered both A3 and A4

 

[flyfisher55]

amp on one LED on

 

[flyfisher55]

Re checked  voltage,
OA        68.2
1A        230.1
B-A/B  000.0
1B        229.5
OB      -000.1

 

[Paul Birkeland]

Can I see a photo of the bottom of the small PC board?

 

[flyfisher55]

small board