Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on March 12, 2022, 07:38:53 pm

Title: Something New
Post by: TIMBO on March 12, 2022, 07:38:53 pm

Hi guys,
I have not come across this before
(https://i.imgur.com/SqtPHzs.jpg)
It appears that the laminates have voltage on them and are insulated from the outer frame that holds it to the chassis
The tag is between the laminates and insulation and then disappears into the winding.
The insulation seems to be working but if you touch the frame around the laminates, it a 250v sting.
Why would the laminates need to have voltage on it?????

Title: Re: Something New
Post by: tubeswell on March 12, 2022, 07:55:39 pm

I say it's illegal (a contender for the Real Dodgy Bastard Award)

Title: Re: Something New
Post by: TIMBO on March 12, 2022, 09:53:13 pm

Thanks mate,
Tab removed from under the laminate, no voltages on the laminates.
Doesn't seem to have any effect on the OT's operation.

Title: Re: Something New
Post by: kagliostro on March 13, 2022, 01:55:02 am

I've seen one of the hot wires of the secondary connected to the lamination (and then to ground) only on Microwave Oven transformer never seen something like what you haved


Franco