Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mresistor on June 10, 2012, 08:42:34 am

Title: Speed Pot for Hoffman AB763 ?
Post by: mresistor on June 10, 2012, 08:42:34 am

Hi I searched and couldn't find the answer. In a Fender AB763 the speed pot is a 3MA-R reverse wound. In Dougs AB763 it appears it is a 3MA not reverse wound.  Is this correct?

Title: Re: Pots for Hoffman AB763 ?
Post by: sluckey on June 10, 2012, 09:09:50 am

I'm guessing Doug just has it listed wrong on his layout and in his parts list. I say that because he sells a 3MRA pot but does not sell a 3MA pot. I bet Doug could clear this up.

Title: Re: Pots for Hoffman AB763 ?
Post by: P Batty on June 10, 2012, 09:42:53 am

What ever it is, its worked fine in my AB763 build.

Title: Re: Pots for Hoffman AB763 ?
Post by: mresistor on June 10, 2012, 10:05:36 am

Steve - I think you're right. In my HPR the speed pot is a 3MA-R so I'm going to go with that, since they are the same tremolo circuit.
Thank you for your help.

Title: Re: Speed Pot for Hoffman AB763 ?
Post by: PRR on June 10, 2012, 10:10:45 pm

The way it works, a Reverse is better.

Linear will be fine electrically , but the fast zone will be all cramped up on the dial.

Title: Re: Speed Pot for Hoffman AB763 ?
Post by: EL34 on June 11, 2012, 09:43:49 am

Go to my pots page and read what it says for the CTS amp pots

http://www.hoffmanamps.com/MyStore/catalog/parts5.htm (http://www.hoffmanamps.com/MyStore/catalog/parts5.htm)