Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Mehfuzhoss on February 21, 2020, 12:05:36 pm

Title: 2204 using Hammond 290GX PT
Post by: Mehfuzhoss on February 21, 2020, 12:05:36 pm

Hello El34world,

On the secondary side of the PT there are two black wire (well one is glossy black, one is matt black). my question is, how can i figure out the black wire that has 3.15v? the other black wire will connect to ground. please help. spec sheet is attached.

Title: Re: 2204 using Hammond 290GX PT
Post by: SnickSound on February 21, 2020, 12:18:27 pm

I believe the 3.15V one will be a thicker gauge. Are there differences in wire thickness?

Been a while since I built mine, I'd have to open it up to see

Title: Re: 2204 using Hammond 290GX PT
Post by: sluckey on February 21, 2020, 12:25:20 pm

Quote from: Mehfuzhoss on February 21, 2020, 12:05:36 pm

Hello El34world,

On the secondary side of the PT there are two black wire (well one is glossy black, one is matt black). my question is, how can i figure out the black wire that has 3.15v? the other black wire will connect to ground. please help. spec sheet is attached.

Connect one probe of your ohmmeter to the orange wire. Now touch the other meter probe to a black wire. If you have a very low resistance (close to zero ohms) then you got the right wire. Twist it together with the orange. If no, grab another black wire.

Title: Re: 2204 using Hammond 290GX PT
Post by: Mehfuzhoss on February 21, 2020, 02:18:53 pm

yes different gauges. the shiny black is thicker, must be this one the 3.5v

Title: Re: 2204 using Hammond 290GX PT
Post by: sluckey on February 21, 2020, 02:22:36 pm

Do what I suggested and be sure.

Title: Re: 2204 using Hammond 290GX PT
Post by: Mehfuzhoss on February 23, 2020, 08:43:30 pm

the thicker black wire shows lower resistance. i used that one with orange for heater wire.