Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Pepe125 on December 07, 2020, 03:50:53 am

Title: transformer mpt 50
Post by: Pepe125 on December 07, 2020, 03:50:53 am

Hello, I need to know what the secondary voltages of this transformer are. It is for a plexi 100.
And also where I can find the graphic diagram of the connections.Thank you and best regards

Title: Re: transformer mpt 50
Post by: Latole on December 07, 2020, 04:36:02 am

https://el34world.com/Forum/index.php?topic=16942.0

Title: Re: transformer mpt 50
Post by: sluckey on December 07, 2020, 09:46:01 am

MPT50 is for a 50 watt amp not a 100 watt amp. For more info about the old style and the new style, look here...

     https://el34world.com/Transformers/marshall.htm

Title: Re: transformer mpt 50
Post by: Pepe125 on December 10, 2020, 12:32:10 pm

Thanks to all I have already found what I do not see is the bias voltage I suppose it will be about 98V. or 100v

Title: Re: transformer mpt 50
Post by: sluckey on December 10, 2020, 12:48:18 pm

There is no separate bias winding on the MPT50. You'll have to source the bias voltage from the HT winding, just like Marshall did.