Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubenit on November 19, 2014, 08:52:33 pm

Title: More Blues Jr conversion options
Post by: tubenit on November 19, 2014, 08:52:33 pm
Quote
You know, there are so many of these Blues Juniors out there       They make a great carcass for projects

Geezer's HoSo56 is one of the finest most touch sensitive amps I've ever played.  You could convert a Blues Jr. to a HoSo56 pretty easily, I think.  You could have the FAT 5879 tone, active FX,  mid boost, and PPIMV.  That should make the volume very controllable for playing at home.   Just a thought.  Same tube count.  Same number of potentiometers used.

Spacing the turret board with similar spacing as a tagboard & using Doug's turret board material and turrets,  the board would be 9.33" long.  The chassis size for a Blues Jr. is 6.25 x 16.3125 (16 5/16) x 2 inches.

 :icon_biggrin:


with respect, Tubenit
Title: Re: More Blues Jr conversion options
Post by: tubenit on November 20, 2014, 05:57:44 am
More Blues Jr conversions for:

HoSo56 with paralleled V1 12AX7
pseudo Plexi
Tweed BluezMeister using EL84's

here:  http://el34world.com/Forum/index.php?topic=17870.0 (http://el34world.com/Forum/index.php?topic=17870.0)
Title: Re: More Blues Jr conversion options
Post by: MFowler on November 21, 2014, 02:23:12 am
Let me know if you don't want this posted here.


About 2 months ago I built a Matchless Lightning into a Blues Jr for a customer.  It was a very easy project and Beldon tube sockets fit well in stock openings.

Mark

EDIT:  more on Mark's build here: http://ampgarage.com/forum/viewtopic.php?t=25676 (http://ampgarage.com/forum/viewtopic.php?t=25676)
Matchless Lightning schematic here:  http://el34world.com/charts/Schematics/files/matchless/matchless_lightning15.pdf (http://el34world.com/charts/Schematics/files/matchless/matchless_lightning15.pdf)
Matchless Lightning layout here:  http://ceriatone.com/images/layoutPic/matchlessLayout/Lightningceriatone.jpg (http://ceriatone.com/images/layoutPic/matchlessLayout/Lightningceriatone.jpg)
Title: Re: More Blues Jr conversion options
Post by: EL34 on November 21, 2014, 03:55:38 am
Hey Mark,
Did you keep the stock PT and OT?


The stock OT sounds good?



Title: Re: More Blues Jr conversion options
Post by: MFowler on November 21, 2014, 11:03:08 am
Quote from: EL34 on November 21, 2014, 03:55:38 am
Hey Mark,
Did you keep the stock PT and OT?


The stock OT sounds good?


Doug, I used Allen Amps TP-24 and Mercury Mag OT-020-JM that a friend gave me.


I rotated the speaker baffle board so it would not interfere with the new OT.
The reverb pot hole is now a treble cut control.


Mark