voltage check problem with PJCCS

[denti alligator]

I'm getting 15V at A5 and 30V at B5.  What's gone wrong??

Yep, right channel isn't working. Can't seem to find where I went wrong.

 

[denti alligator]

Never mind! I had one of the rectifier diodes in wrong. But in trying to remove it I snapped it in two.  

So I just soldered the f&%#er back together ... turned it around, checked the voltages: everything fine. Turned it on, and yes, it works. Should I have a new diode sent from BH or is what I did kosher?

 

[jrebman]

Sam,

You soldered a broken diode back together and it worked?  That's amazing -- bet you can't do that again .  Yes, I'd definitely get a replacement.  It would be interesting to know how long that repaired diode will last, but I'm guessing it won't be long.

-- Now let's see you do that with a microprocessor chip!

-- Jim

 

[denti alligator]

Yeah, I was sure it wouldn't work. Not only did it snap in two, I lost part of the bottom half, so really it's only a half-diode with a blob of solder. 

I was sure it wouldn't work. Nice to be surprised! We'll see how long it lasts. In the meantime, I've put in a request for replacement with Queen Eileen.

 

[Irie Roover]

Question,,
I seem to have a similar problem, but my voltage readings are on the A6 15v. & B6 32v.
which rectifier did I mess up? Any suggestion would greatly be appriciated.
Thx

 

[Paul Joppa]

...
which rectifier did I mess up?

The one on the B side  :^)

You may have the D-cells reversed - see the sticky top of this forum

 

[Irie Roover]

I reversed the d cell and got A6 to put out 22v and the B6 is still at 32v.
Where do you think I should look next?

 

[Irie Roover]

Looking a little deeper, I measured my MJE 350 transistor [ B side ] and found the outside poles measure 33v and the centre pole measures 22v. What next do think? Connect the red wire to the outside pole?

 

[Paul Birkeland]

Resolder the center leg of the MJE350 on the offending side.

The middle leg and the case are tied together, and that connection likes to dissipate a lot of heat during soldering and cause problems down the road.

-PB

 

[Irie Roover]

Thank you very much, I will try it now!

 

[Irie Roover]

Unfortunately the MJE 350 resistor (middle post)will not exceed 23 v after resolding.
I may need to order another resistor and replace it!

 

[Paul Joppa]

Middle post is the output of the current source, connected to the plate of the tube. 22 volts is excellent; it should be about 2/3 of the battery voltage.

 

[Irie Roover]

So, when I measure volts at B6 I am to high at 33 v. When I power it on the right side is way loader than the left. When I measure the MJE 350 on side it's output is still high at 33v.
Any suggestions to get both channels even?

 

[Paul Joppa]

B6 should connect to the middle lead of the MJE350 transistor. Apparently it does not, since the transistor is at 22 volts and B6 is at 33 volts.