Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Travis8 on July 12, 2022, 09:30:55 am

Title: Help with Supro 1960T
Post by: Travis8 on July 12, 2022, 09:30:55 am

Hi!

I wanna know how can I check where is the problem on my Supro 1960T.

Thanks

video: https://drive.google.com/file/d/1QtJjcMc1Fi2pkPdsuHvOWil7fMhNr6MX/view?usp=sharing

Title: Re: Help with Supro 1960T
Post by: Lectroid on July 12, 2022, 03:27:50 pm

That djinn you've imprisoned in that little glass bottle?  He's pissed!

Title: Re: Help with Supro 1960T
Post by: shooter on July 12, 2022, 05:50:48 pm

maybe start here
Trouble shooting an amp problem guidelines (el34world.com) (https://el34world.com/Forum/index.php?topic=21999.0)


maybe post what you've tried so far, DCv's, scope shots...

Title: Re: Help with Supro 1960T
Post by: Travis8 on July 13, 2022, 05:38:55 pm

Nice!!.

Some recommwndation looking at the video?

Title: Re: Help with Supro 1960T
Post by: sluckey on July 13, 2022, 05:52:59 pm

Swap the output tubes around. Does the light show stay with the tube?

Title: Re: Help with Supro 1960T
Post by: Travis8 on July 15, 2022, 04:11:32 am

Quote from: sluckey on July 13, 2022, 05:52:59 pm

Swap the output tubes around. Does the light show stay with the tube?

This blue light stay all the time, I just turn on and off the amp to show the problem

Title: Re: Help with Supro 1960T
Post by: sluckey on July 15, 2022, 07:16:22 am

Of course it does. But does the blue light only occur inside that one tube, regardless of which socket it is plugged into?

Title: Re: Help with Supro 1960T
Post by: tubeswell on July 15, 2022, 11:59:05 am

Try what sluckey is suggesting- swap the output tubes around and see if the problem stays with the tube or stays with the socket.


(PS switch the amp off before swapping the tubes around)

Title: Re: Help with Supro 1960T
Post by: Travis8 on July 27, 2022, 05:59:51 am

Quote from: tubeswell on July 15, 2022, 11:59:05 am

Try what sluckey is suggesting- swap the output tubes around and see if the problem stays with the tube or stays with the socket.


(PS switch the amp off before swapping the tubes around)

I try it and the proble persist in the valve, but now is in the other socket..

So maybe the problem is the tubes ...

The same issue happens in the other tube but less pronounce

Title: Re: Help with Supro 1960T
Post by: sluckey on July 27, 2022, 06:50:37 am

I agree