Fuse blown

[shooter]

usig this PS drawing;


after you disconnect R68 (on the "right")  clip a gator clip on the free'd leg.  connect meter + to the gator clip.
connect the neg meter lead to chassis
powerup and read VDC,  should be 100's of VDC

[sluckey]

Show us a ***BIG*** hi-rez pic that shows your rectifier socket, PT, and filter cap can. When I say ***BIG*** I don't mean a little 640x480 pic. Need to be able to see the wiring between PT, rectifier socket, and cap can. Also want to see where the PT center tap (usually red/yellow wire) is connected to chassis. Should be able to see all of this in one hi-rez pic.

[sclinchy]

OK, thanks. Did my best to get everything in one picture, but I’ve attached a second picture of the cap can wiring as well. As big as the forum would allow.

[sclinchy]

Re: Fuse blown
« Reply #50 on: February 28, 2022, 04:14:22 am »

Like[/r]

• Quote
• [/l]
  
  usig this PS drawing;
  
  
  after you disconnect R68 (on the "right")  clip a gator clip on the free'd leg.  connect meter + to the gator clip.
  connect the neg meter lead to chassis
  powerup and read VDC,  should be 100's of VDC
• Well, I managed to break a lead off of R68 while unsoldering that. I don’t have any on hand, i just ordered some.

[sluckey]

OK, thanks. Did my best to get everything in one picture, but I’ve attached a second picture of the cap can wiring as well. As big as the forum would allow.

I specifically asked for a ***BIG** pic, not a tiny 480x640 EGA size pic. Read the last line in this ***BIG*** pic. Your 135.9K size pic ain't even close to exceeding the forum limit.

[sclinchy]

Let me try again. I tried Actual and Large, both were rejected. Maybe if I send one per post.

[sclinchy]

One at a time seems to work.

[sluckey]

Maybe I'm just seeing a shadow but looks like the tube is plugged in wrong. Look at the pic then look at your amp and please confirm.

If the tube is plugged in correctly you should see the filament glowing.

[sclinchy]

I think you’re right!  I just pulled the tube and broke the base (the part that goes into the middle of the socket). I did the same thing years ago!


I’ll have to order another one (sigh) and carefully plug it in when I get it. I foolishly assumed that the tube wouldn’t fit into the socket unless it was aligned properly.


Thanks once again for the help, let’s hope this does the trick.

[shooter]

Pin 8 IS pin 8, verified?

 
ok, i'll quit using words, pics only from here on out 

[sluckey]

See why we want ***BIG*** pics?

You can still use that tube if you plug it in correctly. Use a paint pin to put a white dot on the chassis next to pin 8. Put another white dot on the tube base next to pin 8. Align the white dots and insert the tube. I have a 6L6 that has a broken key. Dots work fine.

You may even want to buy a pack of these...

     https://www.tubesandmore.com/products/keyway-replacement-piece-octal-tubes

[mresistor]

Also next time try tapping it out gently from inside the amp. Put a soft wad of cloth under the tube for when it falls free.

[sclinchy]

Pro tip:  If you plug the rectifier tube in correctly, it will send DC voltage to your filter caps!


Now measuring 449v DC at the first filter cap. Don’t think I can test any further until I replace the dropping resistor that I broke, but it looks like I’m in good shape.


Many thanks to all of you who stuck with me through this, apologies again for my impatience.

[RadioComm]

You may even want to buy a pack of these...

     https://www.tubesandmore.com/products/keyway-replacement-piece-octal-tubes

Nice! Never knew about these! And all these years I've been hunching over, squinting my eyes, and trying to align octets with broken keys. I'm ordering some just to have them on hand. ttfn.

Couldn't wait. Just added some to my cart.