Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: sebasto13 on March 04, 2015, 02:20:18 am

Title: Re: Hoffman Fender Blues Junior Conversion
Post by: sebasto13 on March 04, 2015, 02:20:18 am
the mercury for blues junior FBLJR-P/E and mercury output transformer FBLJR-O work with the hoffman bj conversion ?

What is the shoke transformer ? It is important for the sound ?

Thx you.
Title: Re: Hoffman Fender Blues Junior Conversion
Post by: EL34 on March 04, 2015, 06:52:38 am
I don't know anything about those transformers
maybe someone else can chime in


A choke smooths out current changes in the amp just like a filter cap smooths out voltage changes in the amp
Title: Re: Hoffman Fender Blues Junior Conversion
Post by: sluckey on March 04, 2015, 07:11:33 am
The MM iron should be a drop in replacement and will work just fine.
Title: Re: Hoffman Fender Blues Junior Conversion
Post by: sebasto13 on March 04, 2015, 03:01:07 pm
- The mercury transformers for blues junior are used to replace those origins by better.
I'm surprised you did not know them.
Here the cabling:
http://mercurymagnetics.com/pages/catalog/sub/ProPrimaryDef.pdf (http://mercurymagnetics.com/pages/catalog/sub/ProPrimaryDef.pdf)


- What is the "mm iron" ?
Title: Re: Hoffman Fender Blues Junior Conversion
Post by: sluckey on March 04, 2015, 03:43:20 pm
"MM iron" = Mercury Magnetics transformers.
Title: Re: Hoffman Fender Blues Junior Conversion
Post by: EL34 on March 04, 2015, 05:24:35 pm
- The mercury transformers for blues junior are used to replace those origins by better.
I'm surprised you did not know them.

I have many things going on all day long and no time to surf web sites and try and remember what every transformer is for by every manufacturer

I depend on my forum members to help others here
That's why you were sent here and that's how you got a good answer from Sluckey




Title: Hoffman Fender Blues Junior Conversion
Post by: sebasto13 on March 06, 2015, 05:10:14 am
add a headphone/line out for direct record is possible on your conversion ?
Title: Hoffman Fender Blues Junior Conversion
Post by: EL34 on March 06, 2015, 06:45:51 am
The guys here may have a way to do that
I never mess with line outs


they don't sound very good to me

Title: Re: Hoffman Fender Blues Junior Conversion
Post by: afireworship on March 09, 2015, 11:39:08 am
I'm no expert but I just did this build myself and I used the Mercury choke and OT. They both work great in this build. I didn't compare stock to Mercury with this build but on the factory fender circuit they made a huge difference in tone and clarity!