Laney TT50H No Outout

[g1]

Aside from the wires Chuck mentioned above, this is the second time you lost heaters for V1 thru V5. How did you get them running last time?

[ca7922303]

In post #21 of your grid stopper thread I discouraged you from messing with the orange and white wires on V6 in the photo below. Did you mess with them anyway? This is your filament circuit.

When doing anything under board because wires to lugs are so tight, those wires have to be removed, but they are back as they are in photo.

[ca7922303]

Aside from the wires Chuck mentioned above, this is the second time you lost heaters for V1 thru V5. How did you get them running last time?

Will check back on posts, but after switching back red wire to 8 ohm lug, and brown to 4 ohm lug, I have no power on. 123vac @power cord end.

[ca7922303]

Aside from the wires Chuck mentioned above, this is the second time you lost heaters for V1 thru V5. How did you get them running last time?

All boards are loose right now. V5 repair is still good, all wires are connected. Don't see any obvious reason for no power. Removed and checked presence pot previously(good). Resoldered it in. Any thoughts on were to check before I put it all back together again. Thanks

[g1]

Check resistance from V5 socket heater pins to V6 socket heater pins. Main power fuse is good?

[ca7922303]

Check resistance from V5 socket heater pins to V6 socket heater pins. Main power fuse is good?

V5-V6 heater pins(0.00 ohms). Main t5al 250v fuse is good.

[g1]

So V5 pin9 to V6 pin9 is zero ohms, and pin4 V5 zero ohms to V6 pin4 ?
If you haven't resoldered V6 socket yet, I would suggest you do that.
Have power switch wires been removed and are they connected correctly?

[The Dude]

With tubes in and filament winding of PT hooked up, any filament pin will read low resistance to any other pin even if a trace is broken somewhere, so I'm not sure that test tells us much.
IMO, it doesn't seem like the OP has any interest in learning how the amp works and just wants us to tell him what to do step by step. This thread might be less than 384 posts if a little initiative was taken to actually learn something about the circuits and how they work. It seems to me like we are just going in circles- 1 step forward, 3 steps back. This thread started July 2020. That's plenty enough time to build the amp from scratch.

[ca7922303]

So V5 pin9 to V6 pin9 is zero ohms, and pin4 V5 zero ohms to V6 pin4 ?
If you haven't resoldered V6 socket yet, I would suggest you do that.
Have power switch wires been removed and are they connected correctly?

Yes on 9 to 9 and 4 to 4.;Power switch wires have never been removed.

[ca7922303]

With tubes in and filament winding of PT hooked up, any filament pin will read low resistance to any other pin even if a trace is broken somewhere, so I'm not sure that test tells us much.
IMO, it doesn't seem like the OP has any interest in learning how the amp works and just wants us to tell him what to do step by step. This thread might be less than 384 posts if a little initiative was taken to actually learn something about the circuits and how they work. It seems to me like we are just going in circles- 1 step forward, 3 steps back. This thread started July 2020. That's plenty enough time to build the amp from scratch.

Thanks for you response. You've been such a great help.

[The Dude]

Believe it or not, that was help. I'm suggesting that you do some reading so that you actually understand what goes on in an amp. It would make things much easier. Step out of the trees and look at the whole forest. See this thread.

https://music-electronics-forum.com/...onal-resources

[ca7922303]

So V5 pin9 to V6 pin9 is zero ohms, and pin4 V5 zero ohms to V6 pin4 ?
If you haven't resoldered V6 socket yet, I would suggest you do that.
Have power switch wires been removed and are they connected correctly?

When I swapped red wire for brown wire earlier, I had no output on 8 & 4 ohm output jacks, but was able to get noise by tapping cable in instrument jack a few times from the 26 ohm output jack. Then it stopped. Swapped red and brown wires back to correct position according to board and now no power. Could wires being crossed cause the no power or likely something else ? Thanks

[Enzo]

Never forget, when you connect and disconnect specific things, you ar also mechanically affecting the entire board. SO rather than those particular wires directly causing an issue, it MIGHT be that simply moving things around to deal with the wires caused issues elsewhere.

[ca7922303]

When I swapped red wire for brown wire earlier, I had no output on 8 & 4 ohm output jacks, but was able to get noise by tapping cable in instrument jack a few times from the 26 ohm output jack. Then it stopped. Swapped red and brown wires back to correct position according to board and now no power. Could wires being crossed cause the no power or likely something else ? Thanks

Correction: 16 ohm output jack(not 26).

[g1]

Swapped red and brown wires back to correct position according to board and now no power. Could wires being crossed cause the no power or likely something else ? Thanks

No, those wires from the OT secondary could not cause a 'no power' fault.
Did you measure the main fuse with your meter?
Some of those fuse holders that are in the AC cord socket are reversible. One way is for 120VAC, the other way is for 240VAC, any chance it's that type and the holder is in upside down?
Have the wires on the AC cord socket ever been removed?